Old 10-23-18, 06:19 PM
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The limitation is probably to prevent damaging the rims.
The larger the tire, the greater the outward force on the rim, at the same pressure.

I was once running some 2" tires that advertised a 65psi max on the sidewall.
After breaking the second perfectly good Mavic rim, I realized that was simply too much for the rims, and settled on lower pressures.

Lengthy discussion of hoop stress here: https://www.velonews.com/2017/03/bik...buildup_433214
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