Originally Posted by
Chuckk
Flip the wheel over and that will tell you if it's the wheel or the frame (if it's the wheel, the offset will move to the other side).
If it's the frame, use Sheldon Brown's technique for spreading the rear to center the stays to move the dropouts over.
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I'm so waiting for someone to crimp a ST doing that. And flipping the wheel doesnt always work, if one of the dropouts is more open the wheel can sit canted in the dropout.