SRAM Roam 60 10-Speed Rear Wheel UST compatible CARBON TUNED unidirectional and woven carbon fiber, asymmetrical rim profile WIDE ANGLE profile: 23c, 28mm outside rim width Aluminum nipples with nylon lock ring, SOLO SPOKE design with double butted, stiff steel spokes Durable hub internals with Star Ratchet system and feature SIDE SWAP easy conversion to all axle types Weight: 1515g (26in), 1570g (27.5in), 1650g (29in); Wheel pair in lightest configuration