Gear Options Mechanisms such as flywheels and arms do not need large external gear ratios when the driving motor is already outputting a targeted output speed or torque. Therefore, changing internal gear ratios to fit specific needs allows more efficient and compact mechanisms to be designed. Use the clear window of the V5 Smart Motor to identify one of three user-changeable colored gear cartridges: 36:1 (100 RPM)- High torque, low speed. Great for robot arms and lifting heavy objects