SRAM Rival 22 11 Speed Chainset - GXP BBSRAM has risen to the highest levels of professional cycling by giving riders componentry that inspires confidence and performs flawlessly With many of the world's top teams ‘Making the Leap’ to SRAM, there is little doubt that wins at the Classics, Grand Tours, Ironman, and Cross Worlds were due in part to the lightest, most efficient, and ergonomic road componentry ever made Features: Arm Material: Forged aluminium arms, Machined alloy spider Chainring Material: Machined alloy rings Recommended Chain: PC-X1 Bottom Bracket: GXP (Not included) Weight: 857g (172 5mm 52x36 (w/o BB)Technologies: GXP®: GXP’s Gutter Seal design cuts friction and weight—improving both feel and performance. X-GlideR Chainrings: The chainrings are designed for an optimised shifting performance with the Yaw front derailleur. The stiffer rings (5mm 7075-T6 aluminium CNC-machined) feature upshift rivets with an advanced design adopted from SRAM XX. CNC machining allows for precision control of each tooth shape, ramp, and nearly every shifting feature of the chainring. Chainrings, chain, and front derailleur are designed as a single integrated system for optimized performance Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.