Grow your confidence riding hard over the rough stuff with this CUES FC-U4000-1 crankset's wide-range gearing and seamless pedaling. 52mm Chainline. 178mm Q-factor. Dynamic Chain Engagement+ special gear tip shape improves chain engagement and retention for smooth riding over rough terrain. Durable and lightweight aluminum crank arms. For frames with 68/73mm bottom bracket shells. BB-UN101 LL123 bottom bracket recommended (Sold separately). Compatible with LINKGLIDE AND HG 11-speed chains. Item Specifications: Color: Black, Rings: 32, Number of Chainrings: Single, Crank Length (mm): 170, Drivetrain Speeds: 9, Drivetrain Speeds: 10, Drivetrain Speeds: 11, BB Included: No, Pedal Spindle: 9/16", Spindle Interface Type: Square Taper JIS, Chainring BCD: Riveted, Chainline/Hub Compatibility: 135/142 MTB Hubs, Chainline/Hub Compatibility: 141/148 Boost Hubs, Designed for ebike: Yes, Defined Color: Black,