Calibrating tyre pressure gauges

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Bouncing Buck

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Hi everyone I've been checking my tire pressures which are spot on, 36 & 42 psi but the bikes system is reading 40 and 44 psi, does anyone know how to calibrate the tyre pressure monitors?
Cheers in advance
 
Not sure how to calibrate them, but it does say in the manual that the pressures shown on screen are adjusted for a baseline temperature of 20C (or something like that). No idea why having that baseline is good, would have thought you'd want to have consistent pressure regardless of ambient, but there you go...
 
Not sure how to calibrate them, but it does say in the manual that the pressures shown on screen are adjusted for a baseline temperature of 20C (or something like that). No idea why having that baseline is good, would have thought you'd want to have consistent pressure regardless of ambient, but there you go...

Bizarre, pressure is pressure surely.
 
Yeah, but the pressure in tyres is usually made up of air, which is affected by temperature. That's why some fill their tyres with nitrogen, which won't vary.

All gas pressure varies with temperature (proportional to absolute temperature in a fixed volume). Nitrogen absorbs far less moisture.
 
The bikes tyre pressure monitor is out by approximately 5psi

There?s no doubt that the pressure transmitters will require periodic calibration, but this could only be achieved by accurate measurement of the pressure and temperature and then standardising this to BM?s chosen 20 deg C. Be interested to know if BM have this on their service schedule. Gas measurement?s useless without standardisation - imagine setting track pressure with a stone cold tyre then adjusting again immediately after a session? Appreciate that experienced riders may well know what numbers to expect but for most others it?s a minefield. Apologies for rambling.
 
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