Tamiya 69909 3-Speed Clear Crank Axle Gearbox STEM Kit  [69909]

Transparent 3-Speed Crank Axle Gearbox by Tamiya 69909

Designed for makers and educators, the Tamiya 69909 3-Speed Crank Axle Gearbox provides three selectable gear settings to explore mechanical tradeoffs between speed and torque. It works well in classroom experiments, small robots, and custom model builds where gearing choices matter.

Visible Construction and Compatibility

The unit uses a clear ABS resin case so students and hobbyists can observe gear motion and shaft engagement. Left and right 3mm hex output shafts are supplied for easy connection to many Tamiya construction frames and accessories.

Powertrain and Practical Uses

Supplied with a Type 130 motor, the gearbox delivers steady drive for educational projects and DIY mechanisms. Attach the included crank arms to create reciprocating motion or drive bespoke linkages for simple automation tasks.