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  #13  
Old 05-06-2013, 10:00 PM
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Re: Tire pressure monitor accuracy

TPMSs are calibrated for sea level and are pretty accurate. The indicated TPMS tire pressure should be nearly the same as an accurate tire gauge at sea level.

The TPMS and PSIG reading will differ with altitude however (The TPMS is internal pressure, gauges are measuring relative pressure). At higher altitudes your tire gauge may indicate 40 psi (relative) where the TPMS indicates like 29 PSI and sets off the low pressure warning. There was a thread around here a year or two that went through the physics. A few drivers described their experience driving in high altitudes.
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  #14  
Old 05-06-2013, 10:01 PM
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Re: Tire pressure monitor accuracy

Quote:
Originally Posted by peckmv View Post
Really should be between 32 - 35.
My GY 20s are out of balance at the pressure, I need to cheat to 36 or 38 for a smooth ride.
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Old 05-07-2013, 05:53 AM
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Re: Tire pressure monitor accuracy

Mine is accurate. I compared it to two other gauges.
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Old 05-16-2013, 10:04 AM
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Re: Tire pressure monitor accuracy

Mine read 34 or 35 on the dash but my accurate gauge reads 32. I also race motorcycles and have very accurate gauges. I did notice that all of them are off by the same amount which makes it easy for me to calculate. No big deal.
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Old 05-16-2013, 02:27 PM
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Re: Tire pressure monitor accuracy

Quote:
Originally Posted by studio1930 View Post
Mine read 34 or 35 on the dash but my accurate gauge reads 32. I also race motorcycles and have very accurate gauges. I did notice that all of them are off by the same amount which makes it easy for me to calculate. No big deal.
I'm the OP and have bought 2 new gauges, both of which show about 2 psi below dash reading. I'm going with the dash shows 2 psi high and I'll just live with that. By the way my trusty old gauge reads the same as the new ones.
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