Direct Passenger/Truck

This is the most popular OEM option for trucks. At first glance it seems like a good option, but the market segment which can actually use it is limited. The limitations of these built-in systems will always be the reasons why very few trucks will have a TPMS system as OEM equipment.

 

Pros:

• Precise readings. There is a sensor giving the exact pressure inside the tire

• Immediate response. There is no delay between the sensor in the tire and the receiver in the cab

 

Cons:

• Cannot be accessed by maintenance personnel unless they can get into the cab (which is often locked) and turn on the ignition (often even the main switch has been disconnected).  This would require the maintenance personnel to carry every vehicle’s keys with him, which is extremely impractical.

• Only the driver will have information about underinflated tires. The system relies on the driver to report any under inflation

• Does not show the tire pressures of the trailer. There is no connection availability between the trailer and the tractor.

• Batteries inside tire. All transmitters are battery powered. If the batteries go out, the tire needs to be removed from the rim to access the batteries

• Sensor inside tire, in steel belt or by valve stem. This is doubly a problem:

  • The first issue is that if the transmitter is faulty or needs to be tested, the tire needs to be removed to access the transmitter.

  • The second issue is that the sensor is fragile and will often be damaged during tire removal or installation.

• Transmitter needs to be transferred. The transmitter needs to be transferred to another rim if the rim is exchanged. Many fleets are changing rim/tire packages in the field while the tire company is doing the tire work in their shop. This cannot be done with this type of system

• Damage by balancing beads. Some fleets are using balancing beads to keep the wheel balanced all the time. These beads normally will "beat up" the transmitter regardless of if it’s installed by the tire valve or on a strap around the rim.

• Pickup sensors by each wheel require hard wiring of the vehicle. If installed as aftermarket, the installation is very involved and expensive.

• Time consuming to program. Most systems requires additional equipment (handheld devices) to reprogram after tire rotations or during maintenance

• Expensive as OEM and very expensive installation as aftermarket