Originally Posted by
Koyote
What is the impact (albeit momentarily) of a hard jolt on effective psi? And will that matter in the real world?
During last weekend's gravel race, at one point on a descent I hit a rock so hard that my front tire bottomed out on the rim. I was worried about the tire, but it held air just fine for the remaining 110 miles. If I'd been on hookless rims, would the tire have blown off? It seems (to my non-physicist brain) that such a momentary force could effectively spike the psi beyond the safety threshold. In that case, I would very much prefer hooked rims.
Regardless of the pressure change (which might not amount to much considering how you compressed a few inches of a tire with 80" of circumference), that disturbance of the bead seal with hookless' decreased surface area could have badly burped the tire.
But an added +10% pressure from bottoming out seems unlikely.