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Originally Posted by Chris Y
I would assume (perhaps incorrectly!) that a lower profile tyre would need less pressure, as there's less sidewall to support and/or flex, potentially less heat buildup, etc.
Gut feeling, rather than scientific reasoning  |
From my experience you are basically right. Most of the "core" heat in a tyre comes from sidewall flex, not from friction on the tread surface, that surface temp dissipates as quickly as it gets there!
When I went from 60s to 50s that is what I did, however, I had a hot pressure and temperature goal. With experience (wear patterns and optimising temps) I found that I could run a lower hot pressure as well.
Dtype, I think you really do need to have a hot pressure in mind, temperature requires another person to help you (to be accurate), but you can do pressure by yourself as they don’t drop off that quick (not with road based tyres, at least) If you have a good (motorsport) tyre supplier they should be able to point you in the right direction as to a goal.
With Yoko AO32’s in 60’s, for instance I can say aim for 36 to38 (psi) hot, while AO48 in 50’s around 34 to 36 does the trick. Combine that with a 70 degree C tyre temp and you will be getting the most out of them.