Single-ring AM/DH 1x10sp crankset M640: 68/73mm shell (for 50.4mm chainline) Durable, strong aluminum arms with anodized chainring for increased power transfer and impact protection Integrated spindle, wide-stance bottom bracket with outboard bearings offer increased rigidity Includes HT2 bottom bracket for 68/73mm BCD (rings): 104mm (36T) Color: Black