Originally Posted by
elcruxio
I looked at the hookless ETRTO test and it's basically that a tire on a hookless rim must withstand 110% of the indicated max pressure (max 5 bar) for 10 minutes without blowing off to be deemed safe.
With regular clinchers I remember reading somewhere that the tire must withstand 150-200 % of the indicated max in order to be deemed safe.
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.