Tyre pressure measurements cold/hot

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jml
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Tyre pressure measurements cold/hot

Postby jml » Tue Dec 16, 2014 5:26 pm

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:



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paulm
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Re: Tyre pressure measurements cold/hot

Postby paulm » Wed Dec 17, 2014 11:17 am

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



jml
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Re: Tyre pressure measurements cold/hot

Postby jml » Wed Dec 17, 2014 11:33 am

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



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paulm
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Re: Tyre pressure measurements cold/hot

Postby paulm » Wed Dec 17, 2014 11:38 am

No worries. :D



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Re: Tyre pressure measurements cold/hot

Postby bgradesherco » Sat Dec 20, 2014 9:15 pm

In Qld I have found it varies by as much as 1 PSI F&R after one lap.



jml
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Re: Tyre pressure measurements cold/hot

Postby jml » Sat Dec 20, 2014 9:36 pm

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.



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Re: Tyre pressure measurements cold/hot

Postby bgradesherco » Sat Dec 20, 2014 11:40 pm

I generally set 4 front & 3 rear cold then dont worry about checking them again :wink:



jml
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Re: Tyre pressure measurements cold/hot

Postby jml » Sun Dec 21, 2014 7:33 pm

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



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Re: Tyre pressure measurements cold/hot

Postby Harry C » Tue Dec 23, 2014 6:27 pm

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




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