Shimano Saint RD-M820-SS1 Rear Derailleur - 10 Speed Short Cage Black MFPN=GXA 100 000 00 000 Compatible with Shimano's SW-RS801-S/T/E satellite Valve-Presta RVC (Smooth) Length:110mm Boost Low weight and compact J640176

Shimano Saint RD M820 SS1 Rear Derailleur 10 Speed Short Cage Black MFPN=GXA 100 000 00 000 Compatible with Shimano's SW RS801 S T E satellite Valve Presta RVC (Smooth) Length:110mm Boost Low weight and compact J640176 Compatible with Shimano's SW RS801 S T E satellite shifter (sold separately) Brake Lever Actuation Hydraulic Double or Triple Double Rotor Included No Brake Lever Use Left Drivetrain Speeds 12 Front Der Shifter Compatibility Shimano Road Di2 Color Black Hydraulic Fluid Type Mineral Oil Includes Brake No Adjustable Reach Yes Adjustable Contact Point Yes Defined Color Black Side Left Axle Type 12mm TA Freehub Body Shimano Micro Spline Hub Drilling 32H Hub Spacing 148mm Hub Spoke Type J bend Position Rear Primary Color Gold Rotor Mount 6 bolts