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A carbon super leggero. Either I left a buckle undone on my alpkit or more likely I over tightened it (because it's swaying was really annoying) and it popped.
Anyway, the strap got caught around my rear hub, did a few turns until it was really tight and then it yanked hard on the bag destroying both the bag and the post.
It was a very odd sensation as the seat disappeared from under me. I thought the wheel had collapsed or something.
Utterly gutted. Had to abandon on Flatlands 600 as I managed to snap my seat post. So now I have to do a hilly one