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.
Concaveness can vary, depending on braking technique, pad alignment, rim style, and pad service intervals.
brake type can also change it.