Old Man Mountain 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 increases our rack's load capacity to 70lbs/33kg. Pucks provide a secure upper attachment point for the rack and attach with high strength zip ties to carbon, steel, titanium and aluminum bikes and forks. Fit Kits make it easy to swap between bikes or front and rear mounting with just a few bolts. Fit Kits include thru-axle or QR with mounting points, All necessary hardware, protective tape and pucks