February 26, 2021

Tyre pressure – rule of thumbL hot v cold ?

Tyre pressure – rule of thumbL hot v cold ?

(Not sure if Ive asked this before, if I have apologies)



Read this a while back:



Bike Tyre Pressure Setting – 10% rule



MY manual recommends 32 PSI front solo. I run 36. I found this out by testing as follows:



Inflate tire to cold pressure.

Run the bike a minimum of 20 minutes.

Check hot pressure. It should increase 10%.

If its less you need less air.

If its more you need more air.



Do this in 2 lb increments.




I presume the pressure rise when hot comes from friction between the tyre and the road, and a degree of flexing of the carcass itself. Based on the above, it would look like you can gauge whether the tyre is working properly by the temp/pressure rise between cold and hot.



Does that ring true – could you use that to find out what pressures you should be running for your tyres, your own riding style and weight ?


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