Lean angle, chicken strips and tire pressure - Page 3 - BMW S1000RR Forums: BMW Sportbike Forum
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post #21 of 24 (permalink) Old 08-20-2019, 08:40 AM Thread Starter
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Originally Posted by speedfinn View Post
Note also that tyre pressure changes 0.1 bar per 10 C deg, 1.45 psi per 18 F.
So if you measure or adjust tyre pressure on cold morning/ bike has been sitting in a cold garage, or hot day/ after you have been riding on the streets/ tyre is hot, it will make a difference.
Of course. Because of this, many/most TPM systems temperature normalize the display of pressure. Regardless, it's a standard practice to measure pressure when tires are cold so the measurement is inherently normalized.

My guess is that a lower-pressure tire will tend to warm faster because it will have more flex in the carcass and the flex-friction produces heat.
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post #22 of 24 (permalink) Old 08-20-2019, 09:42 AM
Elk
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You are correct; a tire with lower pressure both heats faster and will reach a higher temperature. It will, up to a point, also provide better traction.

'15 S1000RR
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post #23 of 24 (permalink) Old 08-22-2019, 03:31 PM Thread Starter
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You are correct; a tire with lower pressure both heats faster and will reach a higher temperature. It will, up to a point, also provide better traction.
How much of the benefit is the sidewall flex as a minor suspension surrogate to maintain better traction over bumps when leaned over (akin to some frame flex for the same reason)?
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post #24 of 24 (permalink) Old 08-22-2019, 04:58 PM
Elk
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A fun question. I do not know. Certainly the tire's ability to deform helps.

I do know from experience and objective information that grip increases fairly continuously with temperature/lower pressure until a certain point is reached and then grip decreases rapidly.

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