New answers tagged rims
No. That indent or wear groove is to indicate the amount of wear on the rim. If you can no longer see the indent, it means the rim is worn and should be replaced. Sheldon Brown's take. It's similar to if you no longer had tread on a tire. You couldn't re-indent the tire to make new tread.
The wheel should run true radially (up/down) axially (sideways) and should not be twisted (as each spoke applies force at its eyelet, a weakened rim might twist, and this twist might not be noticed whilst truing out axial deflections). The form of the bead interface should be consistent, no dents in any direction (unless the rim is for tubular "stick-on" ...
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