If you're looking for a base for your next robot, look no further than the Rover 5.
The Rover 5 uses 4 independent motors, each with a hall-effect quadrature encoder and gearbox.
The entire gearbox assembly can be rotated at 5 degree increments for different clearance configurations.
You can even replace the tank treads with traditional wheels.

This isn't a wimpy or flimsy robot base.
Weighing in at over 1.2 kg without batteries, this base is heavy duty and can drive over quite a bit.
Check the manual below for dimensional drawings.

Features:

• Adjustable gear box angles
• 4 independent DC motors
• 4 independent hall-effect encoders
• Thick rubber tank treads
• 6x AA battery holder
• 10Kg/cm stall torque per motor

Documents:

• Manual
• Datasheet (Motors)
• Quadrature Encoder Example
• Remote Control Tutorial