- Stiff, lightweight 7050 aluminum arms updated with narrower 176mm Q-Factor - Revised preload collar without the 2mm hex bolt on earlier collars - Future-proof CINCH System allows you to quickly switch out chainrings - 136mm wide spindle: 52mm chainline on bikes with Boost 148mm rear spacing - 143mm wide spindle: for bikes with Super Boost 157mm rear spacing - Backed by a lifetime warranty, includes pedal washers - *Bottom bracket cups/bearings sold separately - 515g (170mm)