The everyday wheel for the performance cyclist. 23mm x 50mm profile provides fast aerodynamic rim. Aluminum Carbon Construction (ACC) rim combines 6061 alloy with UD carbon optimal tire support in a lightweight construction. Stiff 15mm rear axle with sealed bearing hubs and 3 pawl drive mechanism for quick dependable engagement. 18 front 24 rear DT aerolite spokes with Alpina locking alloy nipples. Includes Bontrager internal-cam skewers and alloy presta valve extenders. Compatible with both Shimano and SRAM 9/10 spd cassettes.