Originally Posted by
hassouni
I have tried other wheels. Still off center. It has horizontal rear dropouts, but I don't know how to line up wheels in them
There should be a thumbscrew in the back of each dropout, the tip of it protrudes into the axle cutout and lets you adjust the front/back position of the axle. You adust them to center the tire between the chain stays. I just bought a bike missing the screws, which makes it a real pain.