Smooth shifting by SIDE SWING mechanism
For 38-28T crankset
Chainline: 48.8mm (142mm OLD)/ 51.8mm (148mm OLD)
Chainstay Angle: 66-69 degrees
Compatible Chain: CN-M9100
Action: side swing
Cable Route Type: Front-Pull exclusive
Mount: direct mount
Speeds Front: 2-speed
Speeds Rear: 12-speed
Top Gear Teeth: 38T
Total Capacity: 12T
Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.