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When adding backbone stretch of 2 inches, a measurement is taken from the centerline of the rear axle (in the case of a rigid) or the pivot axle (on a bike with a swingarm). The neck is then moved 2 inches away from and perpendicular to that centerline. Next, calculations are made to determine the length and any bends that may be needed in the new backbone and bottom rails. From there, the frame is welded up in a jig as usual. View Related Article
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