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how much can I put in a 1.5" tyre?
Too much.
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If Stans rate their Crest to 39psi with a 2.2" tyre and 36psi with a 2.5", how much can I put in a 1.5" tyre?
60psi
https://www.engineersedge.com/material_science/hoop-stress.htm
Hoop stress is directly proportional to the product of pressure and cross section diameter. Hoop stress is the main thing trying to break the sides of the rim off the bed.
Howard
gbj_tester
@umop3pisdn
If Stans rate their Crest to 39psi with a 2.2" tyre and 36psi with a 2.5", how much can I put in a 1.5" tyre?