Details
* 1-piece forged aluminum arm/spider design with an integrated, HollowTech-II (HT2) bottom-bracket spindle for improved power transfer
* 4-arm 64/104mm BCD with aluminum outer, and steel middle/inner SG-X chainrings with pins/ramps for precise shifting
* Included SM-BB51 wide-stance bottom bracket cupset with outboard bearings offers increased rigidity (fits both 68/73mm with included spacers)
* Designed for a 50.0mm chainline and 135mm hub/frame spacing
speed: 9sp
interface: HT2
rings: 22/32/44
length: 175mm
color: silver/black