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The usual string from the dropout to the head tube, measure the gap from string to seat tube and repeat on the other side. You could also take the crank off and put the frame on a table with the rear end hanging over the edge, the BB flat and measure the height of the dropout from the floor and flip, repeat. That would be more of a pain without removing parts though
PhilDAS
came off the other week and thought bike (fairlight strael) was largely ok except for a fucked fender. i was just waxing my chain and realised the drive side crank gets VERY close (basically rubs) the chain when it is in the smallest cog at the back..... clearly something afoot here...
given the bike fell onto the right side i assume (and am hoping) the crankset is just bent inwards slightly. before buying a new rh crank is there something i can do to check it isnt the frame or something? no dings or dents in the frame... doesn't look out of plumb? has anyone observed this with a shimano crankset before?