The Kyosho MZ6BK-09 Pinion Gear Set contains three 9T pinions meant to keep Mini-Z MR-03 cars well serviced. These gears help preserve smooth power transfer and predictable handling on indoor circuits.
While optimised for the MR-03 chassis, the pinions also work with MR-015 and MR-02 models. They are a straightforward replacement for damaged or worn pinions and are commonly kept as pit spares for quick roadside repairs.
Use this set during routine checks or when gearing feels imprecise. The 9-tooth ratio is a reliable baseline for general running, and swapping takes only a few minutes if you carry the right driver.
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