Its a groove of maybe <1mm but affects the way my wheel sit. I used to run the frame with quick release as I converted it into a road bike. But now Im using the frame as a single speed with traditional single speed wheelset (nut tightened). I only observed this after taking off my wheels today to change my freewheel with a different teeth counts. should i be worried? it affects my tensioning;too much slack or too tight, and its very annoying. Is the dropout done? should I file the dropout to an even surface? Its a steel frame
by Kachawali