Why Comparing TPMS Systems Actually Matters (And Why Most Guides Get It Wrong)
Search "best TPMS Australia" and you'll find plenty of listicles. Five products. Star ratings. A vague recommendation at the end. What you won't find is anyone explaining why one system is better than another for your specific setup.
That's a problem. Because choosing a TPMS for a 4WD and caravan combo is nothing like choosing one for a daily driver. The features that matter, the sensor count you need, even the way the alert system works: all of it changes depending on what you're towing, where you're going, and how far off the grid you plan to be.
Australia has over 834,000 registered caravans as of 2025, according to the Bureau of Infrastructure and Transport Research Economics (BITRE). That number keeps climbing. A lot of those caravans are hitched to 4WDs and heading somewhere remote, where a tyre blowout or wheel bearing failure can strand you hundreds of kilometres from help.
A NHTSA study (DOT HS 811 681) found that TPMS is 56% effective at preventing severe underinflation, the kind that leads to blowouts. Vehicles with tyres underinflated by more than 25% are three times more likely to be involved in a tyre-related crash. Those are US numbers, but physics doesn't change at the border.
So the comparison deserves more than a listicle. This guide walks you through 10 specific dimensions you should evaluate before buying any TPMS system — with enough detail for you to make the call yourself.
The Basics — How Aftermarket TPMS Works (And What Makes It Different From Factory Systems)
If your 4WD rolled off the lot after 2012 or so, there's a decent chance it already has some form of tyre pressure monitoring built in. That factory system typically uses indirect monitoring. It watches your ABS wheel speed sensors and flags when one tyre is spinning at a different rate than the others (because an underinflated tyre has a slightly smaller rolling diameter).
Indirect systems are cheap to build, but they have real limitations. They're slow to detect gradual leaks. They can't tell you the actual pressure in each tyre. And here's the big one for anyone towing: factory TPMS doesn't monitor your caravan, horse float, or boat trailer tyres at all. Your tow vehicle's ABS system has no idea what's happening behind the coupling.
That's where aftermarket direct TPMS comes in. These systems use individual sensors (usually external ones that screw onto each tyre's valve stem) that measure actual pressure and temperature. Each sensor transmits wirelessly to a display mounted on your dashboard.
The wireless frequency matters too, though most buyers never think about it. In Australia and Europe, the standard frequency is 433 MHz, which offers roughly 18-24 metres of transmission range under good conditions. North American systems often use 315 MHz, with a shorter range of about 9-12 metres. If you're buying online from a US-based seller, make sure you're getting the right frequency for Australian conditions.
The core value proposition is simple: you get real-time pressure and temperature data for every tyre on your rig (car, caravan, and spares) all on one screen while you drive. No guesswork. No stopping to check with a manual gauge. And if something goes wrong, you know about it before the tyre does.
A quick word on the difference between "direct" and "indirect" TPMS, because this comes up a lot when comparing systems. Indirect systems (the factory-fitted kind) don't measure pressure at all. They infer it from wheel speed differences and recalibrate periodically. That means they can miss slow leaks, can't give you a PSI reading, and become unreliable at low pressures. Direct systems use an actual pressure sensor on each wheel. For aftermarket use on a 4WD and caravan, you want direct TPMS. Every system worth considering uses this approach.
One more thing. Temperature monitoring is the often-overlooked second function of a direct TPMS sensor. Tyre temperature rises during driving. A sudden spike can indicate a problem: overloaded tyres, a dragging brake, or road surface conditions causing excessive heat. Most direct TPMS sensors measure both pressure and temperature, but some budget units only track pressure. Check the spec sheet before assuming temperature data is included.
Is TPMS Mandatory in Australia? The Regulatory Context You Need to Know
Let's clear up the most commonly misreported fact in the TPMS space: TPMS is not mandatory in Australia. Not for new cars. Not for caravans. Not for commercial vehicles. There is no Australian Design Rule that requires factory-fitted or aftermarket TPMS on any vehicle category sold in this country.
This surprises people, because it's been mandatory elsewhere for years.
In the United States, the TREAD Act of 2007 made direct TPMS mandatory on all new passenger vehicles. The regulation, codified as FMVSS 138, requires that a dashboard warning light activates when any tyre drops 25% or more below the manufacturer's recommended pressure. Every new car sold in America since September 2007 has had this system.
Europe followed. Since November 2014, all new passenger vehicles registered in the EU must have TPMS. And in July 2024, the EU expanded its requirements under UN ECE Regulation R141 to include trailers, buses, and heavy vehicles. That means new caravans sold in Europe now need TPMS too.
Australia has done neither.
Bridgestone Australia's technical leader Jon Tamblyn has publicly advocated for mandatory TPMS on all new vehicles sold in Australia, arguing that the evidence from the US and EU is clear: the safety and fuel efficiency benefits outweigh the cost. Whether a mandate eventually comes is anyone's guess. But the fact that the US, EU, and UN have all moved in this direction suggests the question isn't if but when.
The global TPMS market tells its own story. Valued at US $8.0 billion in 2024 and projected to reach US $25.3 billion by 2035 according to Transparency Market Research, the aftermarket TPMS category is growing at 10.2% annually. That growth is driven partly by regulation, but increasingly by consumers who don't want to wait for governments to tell them their tyres matter.
In the meantime, choosing to fit TPMS to your 4WD and caravan puts you ahead of where the regulation is likely heading. More importantly, it gives you real-time visibility on the safety of your tyres — and that's something no regulation can replace.
The 10 Features That Actually Matter When Comparing TPMS Systems
Now you understand how TPMS works and where Australia sits in the regulatory picture. Here's where it gets practical. These are the 10 comparison dimensions that separate a TPMS that works for your setup from one that frustrates you.
1. Sensor Count and Expandability
Start with the maths. Count every tyre on your rig, including spares.
A standard 4WD with a single spare: 5 sensors. A 4WD towing a single-axle caravan with a spare on each: 8 sensors. A 4WD towing a dual-axle caravan: 10 sensors. Some setups with multiple spares or a boat trailer behind the caravan need even more.
The entry-level TPMS kits with 4 sensors won't cut it if you're towing. You'll need a system that either ships with the right count or lets you add sensors later. Pay attention to the maximum capacity too. Some displays top out at 6 sensors. That leaves you short if you upgrade from a single-axle to a dual-axle caravan down the track.
Expandability matters more than people realise. Your rig changes over time. Buying a system with room to grow saves you replacing the whole unit in two years.
Here's how the iCheckTPMS range maps to common setups: the IC005 ($299 AUD) ships with 5 sensors for a standalone 4WD. The IC008 ($395 AUD) covers a 4WD plus single-axle caravan. The IC010 ($489 AUD) handles a 4WD plus dual-axle caravan with spares. All three kits support expansion up to 10 sensors on a single display, so you can start with the IC005 and add replacement sensors at $59 each as your rig grows.
2. Sensor Accuracy
Not all sensors are created equal. The best aftermarket TPMS sensors offer accuracy of ±1.5 PSI with ±3°F on temperature. That's tight enough for real-world reliability.
But here's why accuracy becomes more important at lower pressures. On the highway at 35 PSI, a ±3 PSI margin means your actual pressure is somewhere between 32 and 38 PSI. That's acceptable. Drop to 18 PSI for sand driving, and that same ±3 PSI margin puts you between 15 and 21 PSI. That's a 17% swing either way. At low pressures, small inaccuracies create real safety risks.
If you regularly air down for off-road, look for the tightest accuracy specification you can find. And verify those claims against a calibrated tyre pressure gauge after installation — manufacturer specs and real-world performance aren't always the same thing.
3. Signal Range (And Why Caravanners Need to Pay Attention)
Most aftermarket TPMS sensors have a transmission range of about 7-8 metres under ideal conditions. "Ideal conditions" means nothing between the sensor and the display.
In reality, your setup is full of signal obstacles. Metal storage compartments, gas bottles, water tanks, spare tyre carriers, the caravan chassis itself. All of it attenuates the wireless signal. A 7-metre spec turns into 4-5 metres of real-world range when you've got a fully loaded caravan between the rear axle sensors and your dashboard display.
For rigs where the total vehicle-plus-caravan length exceeds 8 metres (most dual-axle setups), a signal booster or repeater is necessary, not optional. These devices sit midway along your rig and relay the sensor signals to the display. They typically run $80-100 and make the difference between consistent readings and infuriating dropouts.
This is one of the most common complaints in caravan forums: "My TPMS keeps losing signal on the rear sensors." Nine times out of ten, the fix is a booster. If the brand you're looking at doesn't offer one, that's worth knowing before you buy.
4. Alert System — Auto-Calibrating vs Manual Programming
Here's a feature most comparison lists skip entirely, but it matters a lot once you're actually using the system.
Most TPMS require you to manually program high and low pressure thresholds for each sensor. On an 8-sensor setup, that means entering 16 values (high and low for each sensor) through a display that typically has two or three buttons. It's tedious. And if you get a value wrong, you'll either get false alarms or miss genuine warnings.
Some systems take a different approach. Auto-calibrating TPMS learns your baseline pressure automatically. You screw the sensors onto your cold tyres, and the system detects the current pressure and sets alert thresholds from there — typically alarming at roughly 25% above and 15% below that detected baseline.
iCheckTPMS calls this IntelliData™. You don't program anything. Screw the sensors on, and the system sets itself. The practical benefit becomes clear when you've got 10 sensors across a 4WD and dual-axle caravan — zero manual setup, zero room for programming error.
5. Monitoring Frequency — Does It Work When You're Parked?
This one trips up a lot of first-time buyers. Most aftermarket TPMS systems only transmit data when the vehicle is moving, typically needing speeds above 25 km/h before the sensors wake up and start sending.
Think about what that means. You park overnight at a caravan park. A slow leak develops. You get up in the morning, hitch up, and start driving. By the time the system detects the low pressure at 25 km/h, you've already been driving on an underinflated tyre.
Systems that monitor while stationary solve this completely. If your TPMS transmits every five minutes regardless of whether the vehicle is moving, that slow overnight leak shows up on your display before you turn the key.
iCheckTPMS calls this feature InstaData™. The sensors transmit pressure and temperature data every 5 minutes, stationary or in motion. For caravanners who park for days or weeks between drives, this is the difference between catching a problem early and discovering it on the highway.
6. Display Type — Solar vs USB, Standalone vs App
The display is what you interact with daily, so it deserves scrutiny.
Power source: Solar-powered displays with a rechargeable lithium battery backup are the lowest-maintenance option. The solar panel charges during daylight hours; the battery covers nights and overcast days. A good solar display should hold charge for 30 days or more without sun. USB-only displays need regular charging. Easy to forget, and a dead display means no monitoring.
Standalone vs app: Some brands have shifted to smartphone apps connected via Bluetooth. This sounds modern, but it comes with trade-offs. Continuous Bluetooth monitoring drains your phone battery at roughly 10-15% per hour. If your phone dies, your monitoring dies with it. The app may disconnect in areas with poor reception or after a phone update. And you have to actually have your phone unlocked and the app open to see alerts.
For most caravan and 4WD owners, a standalone solar-powered display mounted on the dashboard is more reliable. It's always on, always visible, and doesn't depend on anything except sunlight.
7. Off-Road Adaptability — Pressure Threshold Switching
If you take your 4WD off sealed roads, you probably air down your tyres. Highway pressure might be 35 PSI; for sand driving, you'll drop to 18-20 PSI. For serious mud, even lower.
When you air down, a standard TPMS throws every alarm it has. You've just dropped well below the programmed threshold. Now you need to either silence the alarms, reprogram every sensor threshold for the lower pressure, or just ignore the display for the rest of the off-road section. None of those options are ideal.
A better approach is a system that adapts when you change pressures. Some systems let you switch between pre-set pressure profiles. The most practical approach is even simpler: unscrew the sensors, deflate to your target pressure, screw the sensors back on, and the system automatically resets its baseline to the new pressure.
iCheckTPMS's On/Off Road Mode works exactly this way. Remove a sensor, air down, reinstall, and IntelliData™ automatically recalibrates the thresholds to your new pressure. No reprogramming. No navigating menus on a three-button display in the dust.
8. Durability and Weather Resistance
Australian conditions will punish cheap gear. Dashboard temperatures above 50°C in summer. Red dust that gets into everything. Creek crossings that submerge wheel arches. Coastal salt spray that corrodes exposed metal. Corrugated dirt roads that vibrate for hours.
For sensors, the minimum acceptable rating is IP67, which means completely dust-tight and capable of withstanding immersion in water up to 1 metre deep for 30 minutes. Most reputable TPMS brands meet this standard, but verify it before buying. A set of sensors failing after one wet creek crossing is an expensive lesson.
Sensor weight matters too, and few buyers think about it. A heavy sensor creates an imbalance when it's spinning at highway speeds. Look for sensors under 10 grams each. At that weight, the imbalance is negligible. Heavier sensors (some budget models weigh 15-20 grams) can cause vibration and uneven tyre wear over thousands of kilometres.
For the display, heat resistance is the main concern. A cheap plastic display will warp, fade, or malfunction after a few weeks of baking on an Australian dashboard. Quality units use UV-resistant housings and high-temperature-rated screens.
9. Battery Life and Replacement Cost
External TPMS sensor batteries typically last 12-18 months, depending on the monitoring frequency and temperature conditions. They use small coin cell batteries, with CR1632 being the most common size.
Now do the maths on a 10-sensor system. Every 12-18 months, you're replacing 10 batteries. That's not a dealbreaker, but the cost difference between brands is worth knowing.
Some systems use user-replaceable batteries. You open the sensor, swap the CR1632, close it up, and you're done. The battery costs about $5-10. Other systems use sealed sensors where the battery can't be replaced. When it dies, you buy a new sensor entirely. Depending on the brand, replacement sensors range from $30 to $80+ each.
Over a 5-year ownership period with a 10-sensor system:
- Replaceable batteries: 10 sensors × 3-4 battery changes × $6 per battery = roughly $180-$240 total
- Sealed sensors: 10 sensors × 3-4 replacements × $50-80 per sensor = $1,500-$3,200 total
That's a massive difference. Always check whether the sensors use replaceable batteries before you buy. iCheckTPMS sensors use CR1632 batteries that cost $6 from the iCheckTPMS store and take about 30 seconds to swap. Replacement sensors, if you ever need a new one, are $59 each.
10. The Feature Other Brands Can't Match: Wheel Bearing Temperature Monitoring
Every other comparison dimension on this list involves features that multiple brands offer in some form. This one is different.
Wheel bearing failure is one of the most dangerous emergencies that can happen while towing. When a bearing overheats, the sequence goes something like this: the bearing runs hot, grease breaks down, metal-on-metal contact increases friction, the hub gets hotter, and eventually the bearing seizes. A seized bearing can lock a wheel at highway speed, weld itself to the axle, or, in the worst case, cause a wheel to detach entirely. The grease can ignite, starting a fire that reaches the caravan body within minutes.
Standard TPMS monitors tyre pressure and the temperature at the valve stem. But valve-stem temperature is a poor proxy for bearing temperature. By the time bearing heat conducts through the hub, through the wheel, and reaches the valve where the sensor sits, the bearing has already been overheating for a while.
Hub-mounted wheel bearing temperature sensors solve this by monitoring bearing temperatures directly. These are physically separate sensors that mount on the hub, close to the bearing itself. They wirelessly transmit real-time temperature data to the same display that shows your tyre pressure information.
When the bearing temperature exceeds a safe threshold (typically 100°C), you get an audible and visual alarm. That gives you time to pull over and investigate before the bearing seizes. Bearing replacement costs run between USD $343 and $504 per wheel, according to Synchrony's 2025 automotive cost guide — and that's in US dollars. In Australian dollars, you're looking at roughly $500 to $750 per wheel depending on the vehicle, before you factor in towing and accommodation if you're stranded. A total caravan loss from fire costs far more.
iCheckTPMS is the only brand in the Australian market that offers integrated wheel bearing temperature monitoring displayed alongside tyre data on the same monitor. Other TPMS systems can tell you if your tyre pressure drops. They can't tell you if your bearing is about to seize.
For any serious caravanner, this is worth paying attention to. Bearing failures don't always give you warning signs you can hear or feel from the driver's seat — especially over the road noise and vibration of outback travel. By the time you hear a grinding noise, the damage is done.
This isn't a theoretical risk either. Spend any time on Grey Nomads or Exploroz forums and you'll find thread after thread of bearing failures on long trips. One forum member described smelling burning grease on the Stuart Highway and discovering a cherry-red hub on the caravan's near-side wheel. Another caught a bearing failure only because they stopped for fuel and noticed smoke. These are the stories that make the case for monitoring better than any spec sheet can.
What Your Setup Actually Needs — A Quick Decision Framework
Choosing the right TPMS depends on your rig. Here's how to match features to your situation.
Daily driver (car or SUV, no towing): A basic 4-5 sensor system does the job. You don't need a signal booster, off-road mode, or bearing monitoring. Focus on accuracy, display quality, and ease of installation. Budget systems in the $100-200 range are fine for this use case.
4WD enthusiast (off-road, no caravan): You need 5 sensors (including the spare), off-road pressure adaptability, and rugged sensor build. IP67 durability is non-negotiable. An auto-calibrating alert system saves time when you're constantly switching between highway and off-road pressures.
4WD + single-axle caravan: This is where the feature list gets serious. You need 8 sensors, signal range that covers a longer rig (consider a booster), stationary monitoring for overnight caravan park stops, and ideally wheel bearing temperature monitoring. The iCheckTPMS IC008 covers this setup with 8 sensors and all the features above.
4WD + dual-axle caravan: 10 sensors, signal booster essential, bearing monitoring essential, auto-calibrating alerts to save you programming 20 threshold values. The iCheckTPMS IC010 handles this configuration. For a complete package with signal booster and bearing sensors, the iCheck Bundle Deal at $549 AUD saves $113 compared to buying components separately.
Horse float or boat trailer: Similar to caravan setups, but with an extra consideration: these trailers often sit unused for weeks between trips, and tyre pressure drops naturally over time. Slow leaks go unnoticed because nobody checks the tyres on a parked float. Stationary monitoring (InstaData™) is particularly useful here. The IC005 covers a standalone tow vehicle, or step up to the IC008 if you want to monitor both the vehicle and trailer.
The Hidden Costs Most Buyers Overlook
The sticker price is only part of what a TPMS costs you over its lifetime.
Battery replacement. We covered this in the feature comparison, but it's worth repeating: a 10-sensor system with sealed, non-replaceable batteries could cost you $1,500+ over five years in replacement sensors. The same system with user-replaceable CR1632 batteries costs under $250 in batteries over the same period. Ask about battery type before you buy.
Signal booster. If your rig needs one (and most caravan setups do), that's an extra $80-100. Some brands include the booster in their caravan kits; others sell it separately. The iCheckTPMS Signal Booster is $89 AUD.
Replacement sensors. Sensors get damaged. You might run over one during a tyre change, lose one on a rocky track, or just crack a housing. Replacement cost varies widely. Budget brands sometimes discontinue sensor models, making replacements impossible after a few years. Check that the brand you choose has replacement sensors readily available and affordably priced.
Warranty. Some brands offer 12 months. Others offer 24 months. For a system that sits on your vehicle year-round in Australian conditions, that extra year of coverage matters. iCheckTPMS offers a 24-month warranty from the date of purchase.
Shipping and availability. If you're buying from an overseas brand, factor in international shipping times, customs delays, and the difficulty of getting warranty claims handled from Australia. A brand based in the US might offer great support for US customers, but shipping a faulty sensor back across the Pacific and waiting weeks for a replacement isn't ideal when you're about to leave for a three-week caravan trip. Australian-based brands with local stock and local support have a practical edge here.
Your time. This one's invisible but real. Manual threshold programming on a 10-sensor system takes 20-30 minutes if you're careful. Doing it again every time you switch between highway and off-road pressures adds up across a two-week outback trip. Auto-calibrating systems give you that time back.
The cost of not having TPMS. This is rarely discussed, but worth considering. A single highway blowout on a caravan tyre can cause thousands of dollars in damage to the caravan body, wiring, and suspension, before you add accommodation costs while stranded, towing fees, and the insurance excess. A set of new caravan tyres runs $800-1,200. A NHTSA estimate from 2011 calculated that TPMS saved US drivers more than $510 million in fuel costs across the US vehicle fleet that year alone, because properly inflated tyres use less fuel. Even a modest improvement in fuel economy over a long caravan trip adds up.
How to Read TPMS Specs Without Getting Misled
Marketing specs and real-world performance are different things. Here's how to read between the lines.
"Solar-powered" means the display has a solar panel. It doesn't tell you what happens when the sun doesn't shine. Look for the battery backup specification. How many days does the battery last without solar charging? Some brands quote "solar-powered" but have batteries that die in 3-4 days of overcast weather. Others hold charge for a month or more. The iCheckTPMS solar display, for example, has a rechargeable lithium battery backup rated for 30+ days without sun.
"Up to 10 sensors" might mean the display can show 10 sensors, or it might mean the system can theoretically pair with 10, but the screen only displays 6 at a time and you have to scroll. Ask whether all sensors show simultaneously.
"IP67 rated": but is that the sensors, the display, or both? Sensors need IP67 minimum. The display doesn't need to survive submersion, but it does need to handle heat, dust, and UV.
"Auto-calibrating" has become a buzzword. Some brands call it auto-calibrating if the system detects a pressure change and adjusts after driving a certain distance. Others genuinely learn the baseline when you install the sensor and set thresholds immediately. The difference matters for off-road users who need instant recalibration.
"Works while stationary": check the fine print. Does it monitor every 5 minutes? Every 30 minutes? Only when it detects vibration from wind? The interval determines whether it'll catch a fast leak while you're parked.
"Australian-designed" and "Australian-owned" are used by several brands, but they mean different things. Australian-designed means the product was engineered here (not just imported and repackaged). Australian-owned means the company is domestically held. Neither claim automatically means better quality, but it does mean you're more likely to get local phone support, local warranty handling, and replacement parts without international shipping delays. If buying Australian matters to you, verify both claims on the brand's About page.
"Works with all vehicles" is technically true for most external sensor systems — they screw onto standard valve stems, but check the pressure range. Some budget units top out at 50 PSI, which is fine for highway driving but won't read accurately on truck tyres or heavily loaded caravans running 65+ PSI. Others cap at 87 PSI or higher. Make sure the system's measurement range covers the pressures your specific tyres operate at.
"Real-time monitoring" varies widely. Some systems update every 3-5 seconds when the vehicle is moving and every 5 minutes at rest. Others only transmit when they detect a significant pressure change. The distinction matters if you want to watch tyre temperatures climb during a long descent or track a slow leak in real time.
The safest approach: download the user manual before buying. Most brands host these as PDFs on their product pages. iCheckTPMS publishes theirs on the User Manuals page. The manual tells you what the marketing page won't.
What Real Australian Owners Say — Common Praise and Common Complaints
Forum discussions across Exploroz, Grey Nomads, and various 4WD communities give a clearer picture of TPMS ownership than any product page.
What people consistently praise: Peace of mind on long trips. Catching slow leaks before they become flats. Easy DIY installation of external sensors (most people have it running within 15 minutes). Solar displays that just work without needing to remember to charge them.
What people consistently complain about: Signal dropouts on long caravans (fix: add a booster). False alarms when airing down for off-road (fix: get a system with auto-calibrating alerts or on/off road mode). Battery replacement frequency on external sensors (expected, so factor it into your budget). Budget systems with inaccurate readings or displays that fail in heat.
Some specific feedback worth noting: on ProductReview.com.au, iCheckTPMS users have called it "the best TPMS I have seen in terms of simplicity" and praised the hub temperature sensors as "a fantastic innovation." Some users have also reported signal range limitations with the wheel bearing sensors on longer rigs, a genuine limitation that a signal booster addresses.
The pattern across all forums is clear: people who buy quality TPMS and install it properly rarely regret it. The complaints almost always trace back to buying too cheap or picking a system that didn't match the rig.
One Grey Nomads forum member put it well: they spotted their tyre reading 80+ PSI through their TPMS, investigated, and found a cracked alloy rim. Without the TPMS alert, they'd have been driving until the tyre blew. That's the kind of real-world scenario that justifies the investment. Not the marketing copy on the box. The story from a bloke at a rest stop who avoided a disaster.
Here's the takeaway for your comparison process: look for long-term reviews (6+ months of actual use), not just unboxing impressions. A TPMS that looks great on day one but has signal issues at month six is a waste of money. And pay attention to how responsive the brand is when problems arise. A brand that answers the phone and ships replacement parts quickly is worth more than one with a slightly lower price tag.
Putting It All Together — Your TPMS Comparison Checklist
Here's a quick-reference summary of what to evaluate when comparing any TPMS system for an Australian 4WD or caravan setup.
| Feature | What Good Looks Like | Watch Out For |
|---|---|---|
| Sensor count | Matches your total tyre count including spares; expandable | Maxed-out systems with no room to add sensors |
| Accuracy | ±1.5 PSI or better | Unspecified accuracy; "approximate" readings |
| Signal range | 7-8m minimum; booster available for longer rigs | No booster option; range under 5m |
| Alert system | Auto-calibrating from cold tyre pressure | Manual-only programming for every sensor |
| Monitoring frequency | Every 5 minutes, stationary and in motion | Motion-activated only (requires 25+ km/h) |
| Display power | Solar + battery backup (30+ days) | USB-only; solar with no backup spec listed |
| Off-road mode | Auto-reset when sensors removed and reinstalled | Requires full reprogramming after every air-down |
| Durability | IP67 sensors, under 10g weight, UV-resistant display | No IP rating stated; heavy sensors (15g+) |
| Battery cost | User-replaceable CR1632 ($5-10 each) | Sealed sensors requiring full replacement ($50-80+) |
| Bearing monitoring | Hub-mounted temperature sensors with real-time display | Not available (most brands) |
| Warranty | 24 months | 12 months or unspecified |
The right TPMS pays for itself the first time it catches a slow leak at a caravan park, warns you about a bearing running hot, or alerts you to a rapid pressure drop at 110 km/h. That's not marketing. That's maths.
For the complete iCheckTPMS range covering all of these dimensions, view the TPMS collection here.
Frequently Asked Questions
Is TPMS mandatory in Australia?
No. Australia does not require TPMS on any vehicle category. The United States has required it since 2007 under the TREAD Act, and the European Union has required it since 2014 for passenger vehicles and since July 2024 for trailers under UN ECE Regulation R141. Bridgestone Australia has publicly advocated for an Australian mandate, but as of 2026, fitting TPMS remains a voluntary safety choice.
What features matter most when choosing a TPMS for a caravan?
For a caravan setup, focus on four things: sensor count (8-10 for a 4WD plus caravan), signal range (7m+ with a booster option for long rigs), stationary monitoring (so you catch leaks while parked overnight), and auto-calibrating alerts (to avoid manually programming 8-10 sensors). Wheel bearing temperature monitoring adds an extra safety layer that's particularly valuable for towing.
How many TPMS sensors do I need?
Count every tyre on your rig, including spares. A standard car needs 4-5. A 4WD towing a single-axle caravan needs 8. A 4WD towing a dual-axle caravan needs 10. The iCheckTPMS range offers kits in 5, 8, and 10 sensor configurations, all expandable up to 10 sensors total.
What's the difference between internal and external TPMS sensors?
External sensors screw onto your valve stems from the outside. They're easy to install yourself, portable between vehicles, and use replaceable batteries that last 12-18 months. Internal sensors mount inside the tyre during fitting, require professional installation, and have batteries lasting 5-10 years that can't be replaced. For most caravan and 4WD owners, external sensors are the practical choice. For a detailed comparison, read Internal vs External TPMS Sensors: Pros, Cons and Which to Choose.
How accurate should a TPMS be?
A good TPMS should be accurate to ±1.5 PSI. This matters especially at low pressures: at 18 PSI for off-road driving, a ±3 PSI margin of error means your actual pressure could be anywhere from 15 to 21 PSI. Verify accuracy by comparing your TPMS readings against a calibrated tyre gauge after installation.
Do TPMS sensors work when the vehicle is parked?
Most aftermarket TPMS only transmit when the vehicle is moving above 25 km/h. Some systems, including iCheckTPMS with InstaData™ technology, transmit every 5 minutes regardless of whether the vehicle is in motion. This catches slow leaks during overnight stops, extended parking at caravan parks, and storage periods.
What does wheel bearing temperature monitoring do?
Wheel bearing temperature sensors are separate hub-mounted devices that track the temperature of your caravan's wheel bearings in real time. If a bearing starts overheating (above 100°C), you get an alarm before it seizes, locks the wheel, or causes a fire. Bearing replacement runs $500-$750+ AUD per wheel. iCheckTPMS is the only Australian TPMS brand offering integrated wheel bearing monitoring on the same display as tyre pressure data.
How often do TPMS sensor batteries need replacing?
External TPMS sensor batteries (typically CR1632) last 12-18 months depending on monitoring frequency and climate conditions. Systems with user-replaceable batteries let you swap them yourself for $5-10 per sensor. Sealed sensors require buying a new sensor unit when the battery dies. Check which type your system uses before purchase.
Does my TPMS need a signal booster?
If your total vehicle-plus-caravan length exceeds about 8 metres, you'll likely benefit from a signal booster. Metal compartments, gas bottles, and the caravan chassis itself weaken wireless signals. The iCheckTPMS Signal Booster ($89 AUD) sits midway along your rig and relays sensor signals to the display.
What should I budget for a quality TPMS system?
For a 4WD plus caravan setup, expect $300-$500 AUD for a quality 8-10 sensor system. Add $80-100 for a signal booster if needed, and budget for battery replacements ($5-10 per sensor every 12-18 months). Avoid ultra-budget imports under $100. Sensor accuracy and long-term reliability drop sharply at that price point. More detail on making the right choice is in our TPMS Buyer's Guide for 4WDs, Caravans & RVs.
Can I move TPMS sensors between vehicles?
External sensors unscrew from one vehicle's valve stems and attach to another in seconds. This is useful for people who tow different trailers, share a caravan with family, or sell one vehicle and keep the TPMS. Internal sensors require professional tyre removal and refitting, making them essentially permanent to the wheels they're installed on.
What's the difference between auto-calibrating and manual TPMS alerts?
Manual systems require you to program high and low pressure thresholds for every sensor individually, a process that's tedious with 8-10 sensors and error-prone if you enter a wrong value. Auto-calibrating systems detect your cold tyre pressure when sensors are installed and set alert thresholds automatically. With iCheckTPMS IntelliData™, the system sets high alerts at +25% and low alerts at -15% of the detected pressure. When you air down for off-road driving and reinstall the sensors, it recalibrates to the new pressure without any manual input.
