A motorcycle tire pressure monitoring system (TPMS) uses a small sensor in or on each wheel to read air pressure and warn you when a tire is low. Some bikes have TPMS from the factory, and you can add an aftermarket kit to almost any motorcycle. It is a useful early warning for slow leaks, but it does not replace checking your tires with a gauge.
Here is how motorcycle TPMS works, the types you can buy, what to watch for at tire changes and what it typically costs.
How a motorcycle tire pressure monitoring system works
There are two broad ways a vehicle can monitor tire pressure:
- Direct TPMS puts a pressure sensor at each wheel. The sensor measures pressure (and usually temperature) and sends it by radio to a receiver.
- Indirect TPMS has no pressure sensors. It estimates low pressure from other signals, such as wheel speed from the ABS system. It is generally considered less precise.
Motorcycle systems are almost always direct. Two wheels give an indirect system very little to compare, and riders want actual numbers.
A typical setup has:
- A sensor on each wheel, either inside the tire or on the valve stem
- A receiver, often built into the dash on factory systems
- A display or app that shows pressure and triggers a low-pressure warning
Many sensors sleep while the bike is parked and wake up when the wheel starts turning, which saves battery. That is why some dashes show dashes or blanks until you have ridden a short distance.
Is TPMS required on motorcycles?
No, not in the U.S. The federal standard for tire pressure monitoring, FMVSS No. 138, applies to passenger cars, multipurpose passenger vehicles, trucks and buses with a gross vehicle weight rating of 10,000 pounds or less. Motorcycles are not on that list.
For cars covered by the rule, the warning light must come on when a tire drops to 25 percent below the maker's recommended cold pressure. Motorcycle makers who fit TPMS set their own warning thresholds, so check your owner's manual for what triggers the light on your bike. Aftermarket kits usually let you set the alarm point yourself.
Types of motorcycle TPMS
| Type | Where the sensor sits | Pros | Cons |
|---|---|---|---|
| Factory internal | Inside the tire, on the rim or valve | Clean, integrated with the dash | Sealed batteries; costly to replace |
| Aftermarket internal | Inside the tire, usually valve-mounted or banded | Protected from theft and weather | Needs a tire to be dismounted to fit |
| Aftermarket valve-cap | Screws onto the valve stem | Cheap, fits in minutes | Adds weight at the valve; easy to steal or knock off |
| Phone-based (Bluetooth) | Either style | No extra display on the bars | Phone must be mounted and connected |
Valve-cap sensors
These are the easiest to add. You screw them on in place of the valve cap, pair them with a display or app and ride. The downsides are a small amount of weight at one point on the wheel, possible clearance problems with brake rotors or calipers on some bikes, and the chance that someone unscrews them.
Valve-cap sensors also put extra side load on rubber valve stems at speed. Many riders switch to metal, bolt-in stems when they fit them. Our guide to tube vs tubeless motorcycle tires covers valve stem styles on different wheels.
Internal sensors
Internal sensors sit inside the tire, so they are protected and invisible. Fitting one means the tire has to come off the rim, so most riders add them at the next tire change. Some are valve-stem sensors, and some strap to the rim with a band.
Battery life and sensor replacement
Most direct TPMS sensors run on batteries, and those batteries limit how long a sensor lasts. On most factory-fitted sensors, the battery is sealed and cannot be swapped. When it dies, the whole sensor is replaced, which means breaking the bead on the tire.
Practical tips:
- If a sensor is several years old, consider replacing it while the tire is already off.
- Valve-cap sensors often take a replaceable coin cell. Use the size listed by the maker and check the O-ring seal when you close it.
- A sensor that drops out intermittently is often a weak battery, not a leak.
Corrosion and valve stem care
Valve-stem sensors can corrode, especially where metal stems meet different metals and road salt. Metal valve caps can seize onto aluminum stems through galvanic corrosion, and forcing a seized cap can snap the stem and ruin the sensor.
To avoid that:
- Use the cap type the sensor maker specifies, often plastic
- Replace stem seals and nuts when tires are changed
- Don't overtighten the valve nut; use the specified torque
Tire changes with TPMS
Tell the shop your bike has TPMS before they start. Breaking the bead in the wrong spot can crush an internal sensor, and banded sensors need to be found before the tire is levered off. A good motorcycle tire shop will mark the sensor's location, fit new stem seals and confirm the sensor reads correctly afterward.
Some bikes need the sensors re-registered or relearned to the dash after a replacement. That may take a dealer tool or a specific riding procedure in the owner's manual.
What TPMS costs
Costs vary by bike, region and shop. Rough ranges:
| Item | Typical range |
|---|---|
| Aftermarket valve-cap kit (2 sensors + display) | $40 to $150 |
| Aftermarket internal kit | $100 to $300 |
| Factory replacement sensor (each) | $70 to $200 or more |
| Labor to fit internal sensors without a tire change | About 0.5 to 1.5 hours |
| Labor at a tire change | Often small or included |
Combining sensor work with a tire change saves labor. If you are due for new rubber, our breakdown of motorcycle tire replacement cost shows what that job typically runs.
Reading TPMS warnings on the road
A low-pressure warning is not something to ignore on two wheels. Low pressure makes a bike steer heavily, heats the tire and can lead to sudden failure.
- Slow down and find a safe place to stop.
- Look and listen. Check for a nail, screw or bulge, and for hissing.
- Check with a gauge if you have one. Compare it to the TPMS reading.
- Inflate if you can, then watch the reading. A pressure that keeps falling means a leak.
- Don't ride far on a tire that won't hold air. A temporary plug is a get-home fix at best.
TPMS readings rise as tires warm up, so a cold reading in the morning and a hot reading after an hour on the highway will differ. Set pressures cold, using the numbers covered in our guide to motorcycle tire pressure.
When to see a mechanic
See a pro if:
- A tire keeps losing pressure, or the TPMS warning returns after you top it off
- A sensor stops reading after a tire change or wheel removal
- A valve stem is cracked, bent or corroded, or a cap is seized
- The dash shows a TPMS fault rather than a low-pressure warning
- You see a bulge, cut or object in the tire
Stop riding if the tire is visibly low, bulging or damaged. Our motorcycle repair directory can help you find a tire shop near you.
Frequently asked questions
Are motorcycles required to have TPMS?
Not in the U.S. The federal TPMS standard covers passenger cars, multipurpose vehicles, trucks and buses. Some motorcycles come with it from the factory, but it is not mandated.
Can I add TPMS to a motorcycle that didn't come with it?
Yes. Aftermarket kits use valve-cap sensors or internal sensors and a small display or phone app. Check that the sensors suit your wheel type and valve stems.
How long do TPMS sensor batteries last?
It varies by sensor and how much you ride, but many last several years. On most internal sensors the battery is sealed, so the whole sensor is replaced when it dies.
Does TPMS replace checking tire pressure with a gauge?
No. It is a warning system. Keep checking pressure with a good gauge, especially before long rides and after temperature swings.
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