Muttleyone

Is this rim shot? It is a Mavic OP ceramic rim. I think where the ceramic is missing under the P in the SUP sticker. I think the rim has been flat spotted. What do you guys think?



Thanks
Mutt

dabac

Well, the rim has seem some violence one way or another, that's for sure. Doesn't have to be flat-spotted though, it might just as well have been a sideways impact, like passing too close to a protruding rock. Spinning the wheel while looking for vertical runout is a better indicator for flat spots.
What'll happen in usage is that braking will be a bit grabby every time that spot comes around, but nothing dramatic.

bikinfool

I dented a Mavic mtn ceramic rim that chipped similarly, straightend the ding and sanded the edges of the chipped area smooth, still a bit funky but useable.

jccaclimber

I have tons of tiny dings and chips my my Mavic OP ceramic rims, and have no issues with the grabbing, although my chips are smaller. From an engineering perspective, it doesn't take much of a change in the aluminum rim to cause a chip in the ceramic surface. What that translates to is there might be significant damage to the rim, but it isn't guaranteed. Odds are if it doesn't cause you braking issues and isn't obviously bent or cracked, it's safe to ride. Do make sure though that it's true.