Tamiya Mini 4wd 15187 Light Sp. Ratio Gear for Sp. FM TZ
These are re-releases of popular Grade Up Option Parts.
Usable Chassis below:
15053: Type 3 Chassis.
15132: Type 5, Zero, and Super 1
Chassis. Gear ratio can also be changed to 3.5:1(Kit is set at 4:1)
15187: Super FM and Super TZ Chassis.