Alan, Re-setting the rear dropout spacing is not without some risk. In the early '90s I had a custom steel frame re-set from 120mm to 126mm to make the big jump from 5 speed to 6 speed. This was done by a local, professional frame builder. I rode the cross country Trans Am tour that summer and the frame snapped at the dropout on a climb in the western Appalachians. I can't help but suspect that the stress of the re-set, only 6mm, caused the failure. (By the way, a garage mechanic in Boonevile, KY welded it back together and I completed the trip!)