Originally Posted by
TimothyH
That a 38 mm Gravelking on a 15 mm inside width rim would burp and deflate when dropping off a curb doesn't surprise me at all.
Blowouts aside, an Ultegra wheel isn't designed for curb dropping. A heavier wheel is needed.
-Tim-
A "heavier " wheel would do little to prevent the pressure spike that could be caused by a curb drop. The more likely culprit is a poorly executed curb drop or a bad tire or both. If you hit the ground with all the rider weight, the pressure will go up significantly. And it sounds like the curb drop was made with significant speed. I drop curbs all the time on road bikes, mountain bikes and even loaded touring bikes but I never have enough speed to crash.