Box Four Prime 9 Rear Derailleur - 8-Speed, Wide Cage, Black Rotor Size_No Result high-quality black no-see-um mesh with

high-quality black no-see-um mesh with 2100 tiny holes per square inch

The double-butted design optimizes the spoke's strength-to-weight ratio

and endurance rides on long climbs

Fitted with a 180 bearing model

The robust stainless steel platform ensures stability and longevity

Box Four Prime 9 Rear Derailleur - 8-Speed, Wide Cage, Black Rotor Size_No Result high-quality black no-see-um mesh withUpgrade your bike's drivetrain with the BOX Four Rear Derailleur an 8 speed, medium cage derailleur designed for superior performance, durability, and precision shifting. Engineered with advanced Prime 9 technology, this derailleur delivers less derailleur travel and a refined chainline for smoother gear changes, increased lifespan, and enhanced efficiency on every ride. Constructed with high quality materials such as forged inner and outer cages, die