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I run 30 in the front, and 34 in the rear. I let some air out if I going off road. What is this 10% rule?
 

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Discussion Starter #3
10 % rule

it use to be a rule that the difference between cold pressure and warm pressure would be 10% of the cold pressure,

if you started with a pressure of 30PSI on a cold tire, and you warmed the tire up and the pressure was 33PSI, then you had the correct tire pressure, basicly you were looking for a 10% percent change between warm and cold, change as required

old rule, maybe with modern technology it is no longer valide?
 

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Discussion Starter #5
Are you sure that's not reversed?

We use to do it alll the time on our roadrace bikes,

I have never used Nitrogen?

Air molecules expand with temperature increase, don't they?
 

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Oxygen Molecules expand, Nitrogen does not. Also, the Nitrogen molecules are larger and therefore seepage though the pores on rubber is minimized.
 

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I run 32f and 34r unless I'm going to be running off road for any extended amount of time.
Then I drop them both down to around 18psi..

I have a 10% rule, also.. I get 10% of the worlds bacon.. BWAAAAHAAAAHHAAAAAAAHAAAAAAA!!! :twisted:

(please ignore evil laugh)
 
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