Shimano GRX RD-RX815 Rear Derailleur - 11-Speed Long Cage BLK With Clutch Di2 For 1x 2x MFPN=16277 The 12-tooth X-SYNC pulley wheel

The 12-tooth X-SYNC pulley wheel holds the chain in place reducing bounce and chain slap

and integrated barrel adjuster

The Comp version of Ritchey's XC pedal with fixed front claw dual-sided entry and excellent mud-shedding characteristics

5 Tubeless Folding Black Dual DD Wide Trail

Shimano GRX RD-RX815 Rear Derailleur - 11-Speed Long Cage BLK With Clutch Di2 For 1x 2x MFPN=16277 The 12-tooth X-SYNC pulley wheelShimano GRX RD RX815 Rear Derailleur 11 Speed Long Cage Black With Clutch Di2 For 1x and 2x. GRX RD RX815 Di2 Rear DerailleurOperates with Shimano Di2 for digital electronic shifting Gravel tuned clutch tension provides smooth and reliable mixed surface shifting TECH SPECS Rear Derailleur Mount Type Shimano Rear Direct Mount Rear Derailleur Mount Type 10x1 Standard Rear Der Shifter Compatibility Shimano Road Di2 Cage Length Long Drivetrain Speeds 11