Fit Kit SETQRR contains all the parts to mount the rack to the rear of a road or mountain bike with a 10 x 135mm quick release hub. This kit includes: - 10 x 135mm QR Skewer - A pair of pucks - Clear protective tape - all mounting hardware - Fit Kits make it easy to swap between bikes or front and rear mounting with just a few bolts - Fit Kits protect your bike. Not all bike eyelets are meant for racks, most are only made for fenders or have very low weight limits. Axle mounting protects your frame We partner with The Robert Axle Project to supply our thru axles.