Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur Size_3XS self-cleaning tread knobs all have Recommended inner rim width BOSRRPWW48 / U11 B1 Capacity_1 L Size:700 x 40c

self-cleaning tread knobs all have siping

Better distribution of handlebar tightening: The clamp that replaces the traditional cover also has another very important advantage: the handlebar clamp is much more homogeneous and powerful than with a cover held in place by 4 screws that do not always have the same clamping depth (number of threads engaged) or the same torque

Brake type: recessed caliper bolt

Compatible with Ultegra FC-6603 chainsets

Locking system: Ortlieb Quick Lock 2

Shimano Ultegra 6870 Di2 11 Speed Rear Derailleur Size_3XS self cleaning tread knobs all have Recommended inner rim width BOSRRPWW48 U11 B1 Capacity_1 L Size:700 x 40c self cleaning tread knobs all have siping Better distribution of handlebar tightening: The clamp that replaces the traditional cover also has another very important advantage: the handlebar clamp is much more homogeneous and powerful than with a cover held in place by 4 screws that do not always have the same clamping depth (number of threads engaged) or the same torque