|
Chiming in per my experience.
I was fortunate to be at a track event with Bridgestone. Their calibrated system measured my best gauge to be < 1 psi off. That is my reference point albeit that test was 2-3 years ago.
My other gauges were 2-3 psi off that one so I no longer use them.
My TPMS seems to be close maybe also within 1 psi. Keep in mind it only measures once driving and may read a bit higher than the cold pressures. As temps rise, so do pressures. Some iDrive versions recommend a pressure based on the temp. If 35 is recommended cold, it may recommend 37 hot. If you only read 35 psi then, it may be too low. Although I've not see this in my M2C. Only actuals.
Also as noted, with temps getting cooler, I often set mine 1-2 psi high to allow for the really cold mornings approaching.
PS: With cooler temps now, my tires were reading 32-33 cold. I set them to 35, and quite a difference was felt.
__________________
2020 X3M non-comp, Alpine White over black : Exec Pkg, ventilated M Sport seats, 20"s
2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims
Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i
|