Shim/Spacer KitOur stock setup with no shim is designed to work for the vast majority of riders. By popular demand here is a shim kit for those who want to experiment with different setups. 6 Shims are included, 3 Positive (+0. 25, + 0. 5, +1. 0) and 3 x negative ( 0. 25, 0. 5, 1. 0), these can be stacked to achieve a variety of angles. Adding a Positive shim (we call it positive because it is increasing the angle between front and back wing, usually achieved by