Originally Posted by ksisler

Reddog3; Re a compass for wheels... A cheap, more practical, easy to fold/store, and entirely old-school tool to just use a push pin at the axle center and add a length of string looped around your pencil and then around you go. Remember to twirl your pencil as you good around to keep the line on center. But imho, nothing beats using the specific rim you will later build into the wheels for the specific bike you are building. This can really help with getting canti studs and brake bridges just right as you can visualize the rims specific braking surface.