The Tamiya twin-motor gearbox is a small (3-inch long) plastic gearbox. It contains two small brushed DC motors that drive separate 3mm hexagonal output shafts. There are two ways to put the kit together: with a high-speed 58:1 gear ratio or with a slower 203:1 gear ratio. Either way, the motors provide plenty of power to drive any small robot. For a gearbox with a similar form factor and more gear ratio options.

Specifications:

• Typical operating voltage: 3 V
• Gear ratio options:58, 204 :1
• No-load motor shaft speed at 3V: 12300 rpm1
• No-load current at 3V: 150 mA2
• Stall current at 3V: 2100 mA
• Motor shaft stall torque at 3V: 0.5 oz in 3
• Color: gray