Specifications: Arm material: Forged aluminum arm, machined alloy spider Chainring Material: Machined alloy rings Weight: 857 g (GXP 172.5 mm 52x36 BB not included) Compatibility: SRAM RED® 22, Force 22 & ; Rival 22 Yaw front derailleurs / SRAM PC 1170 & ; PC 1130 chains Recommended chain: SRAM PC 1130 chainTechnology(ies) featured: X-GlideR chainrings / Hidden bolt configurationTechnology:BB30: In addition to significant weight savings, this bottom bracket design also reduces the Q-factor, clears the pegs, increases bearing durability, and strengthens the crank construction.GXP®: The GXP® Gutter Seal design reduces friction and weight, improving feel and performance.PressFit: A variation of the GXP external crankset, PressFit reduces weight by up to 40 grams and makes installation easier by allowing you to press the bearing cups into the frame instead of screwing them in. It requires no modification to the length and diameter of the crank axle. Pressfit 30. This i...