Hope Pro 4 Rear Disc Hub 24H 12x142mm Black Equipped with stainless steel bearings Taller Flanges than the Pro 2 Additional end caps sold separately Convertible to QR 135mm, 10mm Thru Bolt x 135mm, 12mm Thru Axle x 135mm, and 12mm Thru Axle x 142mm with end caps Features a 9-11 road and mountain compatible alloy Shimano Freehub, includes spacer for use with 10-speed road cassettes and 11-speed mountain cassettes