SRAM Red eTap Rear Derailleur B-Bolt and B-Screw ModelNumber=E4680 EC44/40 upper/lower lower stack 12mm

EC44/40 upper/lower lower stack 12mm color black weight 53g

If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention)

two-axis system provides maximum lateral transmission and control at every stride

Color Black Number of Chainrings No Rings Included Crank Length (mm) 170 Crank Intended Use Mountain Weight 418 BB Included No Pedal Spindle 9/16" Spindle Interface Type RaceFace/Easton CINCH Chainring BCD Direct Mount CINCH Chainline/Hub Compatibility 135/142 MTB Hubs Chainline/Hub Compatibility 141/148 Boost Hubs Chainline/Hub Compatibility 150/157 DH Hubs Defined Color Black keyword search RF136

Centerlock Rotor Lockring - External Spline

SRAM Red eTap Rear Derailleur B-Bolt and B-Screw ModelNumber=E4680 EC44/40 upper/lower lower stack 12mmSRAM Red eTap Rear Derailleur B Bolt and B Screw. Upper Bolt and Spring kits for SRAM rear derailleur maintenance and repairs.