The beauty of the design of Old Man Mountain racks is their modularity. Your OMM rack frame will fit your bike, your next bike, and probably your next bike. The Fit Kit is the key. Each Fit Kit contains a thru axle to replace your stock thru axle and provide a strong foundation to attach your OMM rack. Also included are all the components to secure the rack to the frame or fork and prevent it from rotating around the axle.