This is the optional Robinson Racing GEN3 45T Slipper Unit

Few details say "working railroad" like drums stacked on a loading dock

Fits the HPI Savage X and Savage X Flux V2

more durable surface than bare steel

Fits the HPI Savage XL Octane RTR

Powerhobby Hardened Steel 32T Mod1 8mm Pinion Gear MOD 1 Speed Run / Drag Racing HO Rolling Stock This is the optional RobinsonPowerhobby Hardened Steel 32T Mod1 8mm Pinion Gear with 2 Grub Screws Description Fine tune your high power RC vehicles gearing with a Powerhobby Hardened Steel Mod 1 Pinion Gear. Designed for motors with an 8mm output shaft, these heavy duty pinions provide the strength and durability required for large scale RC vehicles, speed run cars, drag racing builds, and other high performance applications. Each pinion features two set screw holes and includes