Tamiya 69912 Double Gearbox Kit - Clear Dual Drive 4-Speed  [69912]

Clear-case double gearbox for hands-on STEM projects

The Tamiya 69912 Double Gearbox is built for hobbyists and classroom use, letting builders study gear interaction during assembly and testing. The unit has a transparent ABS resin housing so you can watch the gear train as it runs, and its twin motor arrangement gives independent left and right control for straightforward R/C robots and small tracked or wheeled machines.

Selectable ratios and practical gearing

This gearbox provides four selectable ratios: 12.7:1, 38.2:1, 114.7:1, and 344.2:1, letting you trade speed for torque depending on the task. It is designed to work with Type 130 motors, which are commonly used in educational and entry-level R/C projects to explore power transmission and mechanical advantage.

Integration and output features

The 3mm hex output shafts make it easy to couple the gearbox to other parts and frames, and the unit integrates well with a variety of Tamiya construction and robotics kits for creative custom builds.