JamieK Posted May 25, 2011 Share Posted May 25, 2011 are tyre pressures lower when its cold? as my tyre was at 34psi yesterday but this morning its cold and its 31psi Quote Link to comment Share on other sites More sharing options...
Guest philgale Posted May 25, 2011 Share Posted May 25, 2011 yes, as they get hotter the pressure rises, not my much tho. was 34psi checked just after a ride? Quote Link to comment Share on other sites More sharing options...
Guest Posted May 25, 2011 Share Posted May 25, 2011 Yes and you should always check your tires when cold also before you go out for a blast Quote Link to comment Share on other sites More sharing options...
JamieK Posted May 25, 2011 Author Share Posted May 25, 2011 just checked what it should be so pumped up to 2.5 bar then just been out on a ride got home and it was 2.75 bar it does change a lot with the heat! Quote Link to comment Share on other sites More sharing options...
Colin the Bear Posted May 25, 2011 Share Posted May 25, 2011 Slightly higher cold pressure for winter riding. Slightly lower when it's baking hot Boyles Law isn't it? Quote Link to comment Share on other sites More sharing options...
Decor58 Posted May 25, 2011 Share Posted May 25, 2011 Bex should be able to answer this one very well PV/T = constantIf the temperature goes up & volume stays same then the pressure goes up Anyway yeah, measure pressure when they're cold! Quote Link to comment Share on other sites More sharing options...
Donnie Brasco Posted May 25, 2011 Share Posted May 25, 2011 Also what's written on your tyre is usually the Max psi pressure,best reffer to your user manual for the recommended pressure. Quote Link to comment Share on other sites More sharing options...
GaryJM Posted May 25, 2011 Share Posted May 25, 2011 I always tend to email the tire manufacturer for the recommded pressures as usually the manual are printed way before the bikes are produced. Most of the tyre manufactures whose tyres I've put on my bikes in the past are quite good and you get a reply fairly quickly.I've even had one txt me the correct pressures in the past. That was dunlop. Quote Link to comment Share on other sites More sharing options...
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