Ideal for automobiles built with little diameter tires like the Fully Cowled Mini 4WD. Provides the littlest gear ratio, 3:5:1, for greater top rates.
They're re-releases of popular Grade Up option Parts.
Useable Chassis the above gear sets.
15053: Type 3 Chassis.
15132: Type 5, Zero, and Super 1 Chassis. Gear ratio can also be changed to 3.5:1(Kit is defined at 4:1)
15187: Super FM and Super TZ Chassis.
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