It's a complete

yet is flexible to accommodate various electrical and battery configurations

smoothing power delivery for improved traction and drivability under the X-Maxx's massive torque

designed for the Drone Racer

This Part Fits the following

HPI Racing 87035 Gear Set 21/13/10 Tooth Reverse Module 22X-4 Parts It's a completeHPI Racing 87035 Gear Set 21 13 10 Tooth Reverse Module This is a genuine HPI Racing gear set for the reverse module, including 21, 13, and 10 tooth gears. These gears keep your reverse system engaging cleanly and transferring power smoothly, and replacing them at the first sign of wear protects the rest of the drivetrain. As factory spec replacements, they drop in place of the originals for a straightforward rebuild with basic hand tools. Genuine HPI