Well, I spent some more time with the wheel. This is a curious injury: there is a "dent" in the rims on both sides, as one would expect were the damage caused by running over something (though one would also expect a pinch flat), but in this case the dents are in the same direction - 'in' on one side and 'out' on the other! - so that the spread between the two rims remains nearly constant. (The long pads never 'notice' the innie - only the outie.)

My talented imagination has come up with no scenario that could cause this. :confused:

Anyway, the hammer wasn't the answer. The mill file was. Thanks BCRider.


FastJake, I didn't try reversing the wheel (probably won't have worked in this case), but I'll keep the trick in mind.