TPM question - K-Bikes.com - Excellence in Motion
 
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post #1 of 4 (permalink) Old Aug 3rd, 2008, 11:08 pm Thread Starter
 
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TPM question

I recently had a new set of tires mounted for my 07 GT. My TPM for the rear immediately showed 2-3 lbs less than what was really in the tire. Yellow warning light came on. I left for Gillette a day later. Along the way the front started reading lower also. Red light finally came on and both tires were supposedly 5lbs low, but three different gauges showed correct air pressure. I asked two different BMW dealers along the way about the problem. One said the sensors were probably damaged, the other said the TPM needed to be re-calibrated with their official service computer. Has anyone else experienced this problem and what was the fix??
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post #2 of 4 (permalink) Old Aug 4th, 2008, 8:48 am
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The TPM read out is temperature compensated, so if you are checking your tires hot, the TPM will not agree with your gauge. Mine has always read a degree low even with the tires cold.

James
Central Texas
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post #3 of 4 (permalink) Old Aug 4th, 2008, 6:19 pm
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Quote:
Originally Posted by JamesM
The TPM read out is temperature compensated, so if you are checking your tires hot, the TPM will not agree with your gauge. Mine has always read a degree low even with the tires cold.
What he said. A 5 psi increase is about right for a hot tire if you're not being aggressive, so if you've got 40 lbs in it cold, you should read 45-ish when it's hot. Sounds like a bit more air is warranted, and check again when the bike is cold.
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post #4 of 4 (permalink) Old Aug 5th, 2008, 6:54 pm
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My TPMs (front and rear) match the various cheap pressure gauges that I have, but they are 3 psi lower than the gauge in the local dealer's service area. The service manager swears that it is well calibrated.

In addition, I notice that the TPMs increase about 2 psi between when I start riding, and when the tires are warmed up, even though they are supposed to be temperature compensated.
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