NPC 2212 Motor This is a great mid-size motor. The 2212 has a dual shaft design so you can run it with two wheels for dual traction, or cut off one side shaft for single wheel drive.
NPC-41250 Motor This powerful motor is a popular choice for middleweight robots. The keyed 1/2 inch output shaft is compatible with many standard wheel hubs.
NPC-T64 Motor One of the most popular combat robot motors out there! This is a great solution for large robots and mobile applications.
NPC T74 Motor A longer, more powerful version of the T64, it is a little faster and a lot more torque than the T64. This motor is a great choice for drive systems of a heavyweight or superheavyweight robot. 1.469" diameter stub shaft with four mounting holes.