Hayes Rear Adaptor to 51mm w/ QR Axle, 8" Rotor<br /><br />Hayes disc brake adaptors are required for all Hayes brakes with the exception of 74mm post-mount forks and 160mm rotors.<br /><br /><li>Adapter Front/Rear: Rear</li><li>Caliper Type: 74mm Post Mount</li><li>Usage: Rear 51mm I.S. frames, standard QR 8"</li><li>Rotor Size: 203</li><li>Caliper Side: Hayes 203mm/51mm I.S. Rear</li><li>Frame/Fork Side: Hayes 203mm/51mm I.S. Rear</li><li>Manufacturer Part Number: 98-15074</li>