1-piece carbon fiber arm/spider design, beveled for maximized clearance with insert-molded aluminum pedal and spindle-interface reinforcements Narrow and efficient 156mm Q-factor with a 49.5mm chainline and a drive-side integrated GXP/BB30 bottom bracket spindle for increased stiffness *GXP (Giga X Pipe) external, sealed bearing bottom bracket cups sold separately (use: TV-2111 for GXP-BlackBox ceramic or TV-2122 for GXP-Team steel) *BB30 (MTB) cartridge bearing set with clips/shields/washer sold separately (use TV-2102 for hybrid-ceramic bearings or TV-2103 for steel bearings): BB30 cranks will also fit PressFit-30 once BB set available Chainring combinations specific to function with 13/14/15t common-denominator, enabling perfectly timed shift-point engineering 4-arm 2x10sp, 6mm 7075-T651 tungsten grey hard-anodized aluminum rings with optimized X-Glide shift pins/ramps, 1-piece alloy 7075-T6 Torx-T25 chainring bolts (bolts thread into spider or big chainring), alloy M15 self-extractor crank/spindle bolt, and pedal washers 750g (GXP) / 690g (BB30)