Throw your bike on the rack, lock it down, and get on the road with the RockyMounts BrassKnuckles Upright Mount. No more removing wheels, fiddling with thru-axle adapters, or worrying about excess stress on your precious bicycle frame. The Upright Mount features ergonomic BrassKnuckles that easily adjust to lock the bar over your front wheel and keep your bike securely in place without ever touching the frame. The Upright Mount can also be folded down when not in use to get better gas mileage.Non-corrosive aluminumMounting hardware compatible with all crossbarsErgonomic BrassKnuckles adjustabilityCompatible with 20-29 inch wheels