Page 1 of 1

Tyre pressure measurements cold/hot

Posted: Tue Dec 16, 2014 5:26 pm
by jml
Most of the recommendations for tyre pressure ranges are between 3-5 psi for the rear and 5-7 psi for the front (depending on many variables) but this left me wondering the other day about at what point should this measurement be taken? are these pressures cold pressures? Lets say that I arrive at an event and unload my bike, which has now been in the ambient temperature and exposed to the sun. Would my "cold" pressure be just before I have started to ride, so I set it to my standard 4R/6F pressure and go off riding? :roll:

Re: Tyre pressure measurements cold/hot

Posted: Wed Dec 17, 2014 11:17 am
by paulm
Unless you're doing a lot of trail/road riding in between sections I doubt it makes a whole heap of difference. Using Mt Kembla as an example - I set mine at 3 rear 5 front as soon as I haul it out of the trailer and check after one lap - no difference. Hope this helps

Re: Tyre pressure measurements cold/hot

Posted: Wed Dec 17, 2014 11:33 am
by jml
paulm wrote:Unless you're doing a lot of trail/road riding in between sections I doubt it makes a whole heap of difference. Using Mt Kembla as an example - I set mine at 3 rear 5 front as soon as I haul it out of the trailer and check after one lap - no difference. Hope this helps


:mrgreen: thanks Paul

Re: Tyre pressure measurements cold/hot

Posted: Wed Dec 17, 2014 11:38 am
by paulm
No worries. :D

Re: Tyre pressure measurements cold/hot

Posted: Sat Dec 20, 2014 9:15 pm
by bgradesherco
In Qld I have found it varies by as much as 1 PSI F&R after one lap.

Re: Tyre pressure measurements cold/hot

Posted: Sat Dec 20, 2014 9:36 pm
by jml
bgradesherco wrote:In Qld I have found it varies by as much as 1 PSI F&R after one lap.


My Dunlop D803's will rise by 1 PSI F&R also after a lap or 15 minutes of riding around. I assume the cold pressure takes into account that the tyres will increase in pressure.

Re: Tyre pressure measurements cold/hot

Posted: Sat Dec 20, 2014 11:40 pm
by bgradesherco
I generally set 4 front & 3 rear cold then dont worry about checking them again :wink:

Re: Tyre pressure measurements cold/hot

Posted: Sun Dec 21, 2014 7:33 pm
by jml
bgradesherco wrote:I generally set 4 front & 3 rear cold then dont worry about checking them again :wink:


I might need to increase my pressures after the Christmas parties :lol: too many party pies

Re: Tyre pressure measurements cold/hot

Posted: Tue Dec 23, 2014 6:27 pm
by Harry C
I never worry to much after the initial check first up as I'll never be a Cabestany, but if you want consistency in pressure then try filling with nitrogen