SRAM Rail 50 10-Speed Rear Wheel UST compatible lightweight aluminum rim with asymmetrical TAPER CORE 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: 1690g (26in), 1750g (27.5in), 1830g (29in); Wheel pair in lightest configuration