The BBMULTI-SHIM kit adapts Shimano or similar 24mm cranks to virtually any BB30/PF30 frame, including mountain bikes, 2x10 systems, narrow-shell road bikes, road triples, etc. For use only with bottom bracket shell widths from 68mm to 83mm. Simply tap the adapters into the 6806 bearing in the BB shell or cups, then install the cranks using the included spacers to adjust chainline, or to take up any side-to-side movement in the crank. Includes 2 adapter shims and a 14-piece assortment of left and right side spacers. Machined engineering-grade Delrin.