Tamiya 70103 Universal Gearbox Assembly Kit Gear Ratios: 101:1 269:1 719:1 Motor: FA-130 Theoretical Speed and Torque output @ 3 Volts: 101:1, 128 RPM, 469 g-cm Theoretical Speed and Torque output @ 3 Volts: 269:1, 48 RPM, 1248 g-cm Theoretical Speed and Torque output @ 3 Volts: 719:1, 18 RPM, 1500 g-cm