Thule Thru-Axle Adapter 12x135mm Shimano 20110730The Thule Thru-Axle Adapter 20110730 allows Thule bike trailers to be compatible with bicycles. Contains One 12mm Thru-Axle Adapter. On the rear of the box there is a ruler to allow you to measure your axle’s length. For Shimano 159mm or 162mm.872299045419