OnRace TPMS: Wireless Tire Pressure & Temperature Monitoring
Real-time pressure, temperature, and (now) tire carcass data, transmitted wirelessly from every wheel to a receiver mounted in the car. Built for everything from club racers to LMP and GT3 programs.
Formerly known as TireWatch, they have joined forces with OnRace and rebranded. Same proven hardware, new name.
The Basics
How the system works
Every OnRace TPMS system is built from the same three building blocks. What changes between setups is how the sensors get located to a corner, and how the RCU picks up their signal.
1
Wheel Sensors
A powered sensor at each valve hole measures pressure and temperature and transmits it over RF, changing to a faster transmit rate automatically under acceleration.
2
Receiver Control Unit (RCU)
The RCU, mounted in the car, picks up the RF signal from all four sensors in real time and figures out which wheel is which.
3
CAN Output
Pressure, temperature, and diagnostic data are sent out over CAN bus (up to 1Mbps) straight into your logger or display.
Step 1: Choose Your Receiver
Gen 4 (Dual Antenna) vs. Gen 5 (Single Antenna) RCU
Both RCUs run the same electronics and both work with the Auto-Locator left/right side sensors by rotation direction, or the Tire Location Module (TLM) sensors. The decision between them almost always comes down to one thing: how much carbon fiber is between the RCU and the wheels, and whether you need the extra reception margin that gives you.
Gen 4 · Dual Antenna
Gen 4 Receiver Control Unit
$4,158.00
- Antennas2
- Mass107g
- Size80 × 42 × 20mm
- RF Frequency433.92MHz
Best for: heavily carbon-bodied cars, full prototypes, closed-cockpit GT cars, anything with a lot of carbon fiber surrounding the RCU's mounting location. The second antenna gives the system a redundant reception path, so signal strength holds up even when carbon is attenuating the RF link.
View Gen 4 Receiver Control Unit
Gen 5 · Single Antenna
GT3 / GT4 Gen 5 Receiver Control Unit
$4,158.00
- Antennas1
- Mass68g
- Size40 × 42 × 20mm
- RF Frequency433.92MHz
Best for: cars without significant carbon fiber shielding the RCU location, tube-frame, steel, or aluminum-bodied cars. At 39g lighter and less than half the physical size of the Gen 4, it's the easy choice whenever reception isn't a concern.
View GT3 / GT4 Gen 5 Receiver Control Unit
Step 2: Choose How Sensors Get Located
Auto-Locator Sensors vs. the TLM System
Both methods use the exact same wheel sensor hardware, the difference is entirely in how the system figures out which corner each sensor is sitting on.
| Auto-Locator (LOC Series) | TLM System (formerly LID) | |
|---|---|---|
| Setup | Enter sensor IDs into the OnRace software and mark which are front, which are rear | Upload all sensor IDs, no manual front/rear or side assignment needed |
| Corner detection | RCU auto-locates left vs. right by each sensor's rotation direction | One LF module per corner detects exactly which corner each sensor is on |
| Extra hardware | None, just the RCU and sensors | 4x Tire Location Module (TLM), one per corner |
| Ideal for | Standard setups where you're comfortable pre-sorting sensor IDs by axle | Cars that don't run offset (staggered) front/rear wheel sizes, crews can grab any wheel off the rack without pre-sorting it by corner |
| Required for IR sensors | No | Yes |
Sensor Hardware
TPMS Wheel Unit Sensor
30±1g · 2-season typical life
- 0–3.50 Bar pressure range, 14.7mbar/bit resolution
- 0–125°C temperature range (150°C peak)
- Fast transmit mode on rapid pressure change (≥200mbar/min)
- Compatible with hand-held LF Trigger tools
Corner Hardware
Tire Location Modules (TLM)
100g · 90 × 37 × 17mm · IP69K
- One LF antenna module mounted at each corner
- Learns a complete set of moving sensors automatically on startup
- Re-learns instantly when wheels are changed, no user interaction required
- Required to run the new Infrared (IR) sensors below
New
Infrared (IR) Tire Carcass Temperature Sensors
Now available! An evolution of the standard wheel sensor that adds real-time infrared measurement of the tire's inner carcass temperature alongside pressure. Carcass temperature is a read on the tire's bulk/mechanical grip, giving a longer-term view of tire behavior that surface temperature alone doesn't show.
- 110° total infrared field of view, sub-divided into 16 pixels
- Select 5 of the 16 pixels at build time to be transmitted in the sensor's datagram
- Same 0–3.50 Bar pressure range and fast-transmit behavior as the standard sensor
- Carcass temperature range: -50°C to +205°C
- 46±1g, 1 season typical life
Requires TLM Corner Modules
IR sensors transmit through the TLM's per-corner LF antennas — they aren't compatible with Auto-Locator-only setups. If you're planning to add IR sensors down the road, spec your system with TLM from the start.
View InfraRed (IR) TPMS Wheel Unit SensorOptional
Trigger Hand Scanner — Your Pit Lane Tool
A handheld RF + LF tool for whoever is confirming tire pressure and temperature as the car leaves or enters the pits, or right after tire mounting. No need to be near the RCU — the Trigger talks to each wheel sensor directly.
- Reads pressure, temperature, sensor ID, and battery status on demand
- View a full set of tires at once, or drill into a single sensor
- Forces sensors into permanent transmit for paddock monitoring in heating huts or tire blankets
- Rechargeable Li-ion, USB-B charging, IP65 sealed
- Mass621g
- Size200 × 120 × 40mm
- LF / RF Frequency125KHz / 434MHz
- SealingIP65
Plug and Play
We'll Terminate Your RCU With Any Connector
Every RCU harness we sell can be terminated with the exact connector your car's loom is already expecting. Tell us what's on the other end — Deutsch, Autosport, whatever your logger or wiring harness calls for — and we'll build it so it's a true plug-and-play install, no splicing required.
Have a connector spec or harness drawing? Send it our way.
Contact Us About Custom TerminationDirect Replacement
Beru BF1 Sensors — Now Available, and In Stock
OnRace wheel sensors can be built and programmed as exact drop-in replacements for genuine Beru F1 TPMS sensors — same fit, same permit list, no software changes. They're significantly less expensive than OE Beru sensors, and unlike Beru, we actually have them in stock.
F1-100-1800-002
F1-100-1521-011
F1-100-1521-010
F1-100-1521-012
- 117g lighter than the OE Beru sensor
- 2 Lighter sensor allows an aluminum valve stem instead of Beru's steel stem — 38g less rotating mass in total (71g OE assembly vs. 33g)
- 3 Same 1Hz update rate as Beru's "Pro" sensors
At 150mph on an 18" rim, that weight difference works out to roughly 168 lbs less centripetal force per wheel (145 vs. 313 lbs). Send us your current Beru sensor numbers and we'll build exact copies — no need to update your permit list.
$203.00
In Stock
vs. genuine Beru OE pricing — contact us for a comparison
OE Beru Assembly
71g
OnRace Assembly
33g
Talk to Us
Not Sure Which OnRace Setup Fits Your Car?
Tell us your chassis, body material, and wheel setup, and we'll spec the right RCU, sensor type, and connectors for you.
