Originally Posted by
cyccommute
I’ll add to check the sidewall of the rim for concaveness as well. Put a straight edge on the rim from the top to the bottom. If the rim is okay, the sidewall should touch the straight edge from top to bottom. If the rim is worn, you’ll see a gap in the middle.
Andra rims have a built-in wear indicator - they start to split at a thin part in the middle of the braking surface before structural failure.
