This tracked chassis from Dagu Electronics makes a great base for building a small tank-like RC vehicle or autonomous robot. The chassis includes a battery holder and two DC motors, with an independent drive train and a quadrature encoder for each tread, so all you need to add to make a complete robot is a robot controller and the sensors of your choosing. A unique mechanism allows you to configure the clearance of the chassis by adjusting the angle of the gearbox assemblies.
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Rover 5 datasheet
Datasheet for the Rover 5 tracked chassis.