Cold Setting A Bike Frame (126mm to 130mm Hub Spacing)

I show how to expand the rear triangle of a steel bike frame to allow a newer wheel with wider hub spacing (ie a 67 speed rear wheel on a road bike is typically 126mm wide, and a 8, 9, 10 speed wheel is 130mm wide). The process is called cold setting and should only be done on a steel frame (not aluminum, carbon fiber, titanium, etc). The process involves expanding the rear triangle beyond where you want to be. And then when relaxing the tension, the frame becomes set at a new wider width between the dropout