The Pro 4 Rear Hub QR Axle from Hope is the benchmark for a disc compatible rear hubs. With Hopes proven reputation for bullet proof quality you have the security that this will be the heart of a strong and reliable wheel. It runs on sealed stainless steel cartridge bearings with a QR axle and a 4 pawl ratchet system with 44 tooth engagement for near instant power transfer. The hub shell is machined from forged aluminium billet with standard 6-bolt disc mount and a large diameter flange. Available in Black Orange Red or Purple with 32 spoke holes.