Adjustable vertical and cross bracing to eliminate side play. Bolt to your wheelie bars. Cross brace kits include clamps for 3/4" or 7/8" tubing, aluminum radius braces, allen bolts, hardened washers and nuts. To measure for verticals: locate the center point on the lower tube end to end, then measure from the top tube center down to the bottom tube center at that location. This measurement must be provided in the comment section of your order.