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Old 12-31-19, 10:58 AM
  #100  
noodle soup
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Originally Posted by Cypress
Given Schwalbe's recommendation od 100 psi for a 25mm tire provided by Sy Reene , the following can be mathematically provided for a wider rim.

My 25mm GP5k's measure out to nearly 30mm on my HED Plus rims, so I used 30mm as the final diameter for simplicity.

25mm cylinder volume: 1033289 ml

30mm cylinder volume: 1516918 ml

Applying Boyle's Law, the final pressure can be given by P1V1 = P2V2, or this fun screenshot I took for conveniences sake:



If your 25mm Schwalbe opened up to 30mm on a wide rim, your final pressure would be 68.12 psi for a comparable ride quality.
So for a 30mm tire, that actually measures 31.54mm on a 23mm inner width hoop? I weigh 185#
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