Rear A-Arms for ARRMA Big Rock, Senton and Granite 4x4's Steering Arm HPI SF-20 Servo Gear Set

HPI SF-20 Servo Gear Set

Gearbox and Transmission

Model car fuel (20-30% nitro recommended)

monster trucks and rock racers running up to 4s LiPo and weighing up to 6

Rear A-Arms for ARRMA Big Rock, Senton and Granite 4x4's Steering Arm HPI SF-20 Servo Gear SetRPM A arms for the 4x4 3S BLX versions of the Granite, Senton & Big Rock are the answer to the questions you didn't know you had. Are you looking for more adjustability? Check! How about better durability? Got that covered too. How about lightweight? Yup, no problem! Adjustability: RPM has added a second shock mount to both front and rear A arms to the outside of the stock shock mount, adding adjustability and improving trackability. RPM's outer shock