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Tamiya 70189 Mini Motor Low-Speed Gearbox (4-Speed) Kit

Vendor's Description: 

Tamiya’s 4-speed low-speed mini motor gearbox features a more compact 030-form-factor brushed DC motor driving a single gear train that can be assembled to have one of 4 gear ratios: 71.4:1, 149.9:1, 314.9:1, or 661.2:1. The gear train includes a self-locking worm gear.