The Benchmark frame jig utilizes standard bicycle frame dimensions for setup read in millimeters on the scales as indicated below. The head tube is located horizontally (X) and vertically (Y) from the bottom bracket center. The effective chain stay length and bottom bracket drop locate the rear axle.

​Angles are set INDEPENDENTLY of these values for easy adjustment. A digital angle finder (sold separately), allows quick and accurate setting of the seat tube and head tube angle WITHOUT  needing to adjust the previously set distances.