Zumo Robot Kit for Arduino No Motors
 

The Pololu Zumo chassis kit contains the components necessary to build a small, high-performance tracked robot platform that is compact enough to qualify for Mini Sumo competitions.
Each side of the chassis has an idler sprocket that spins freely and a drive sprocket that connects to a micro metal gearmotor (not included).
The main body is composed of ABS plastic and has sockets for two micro metal gearmotors and a compartment for four AA batteries (not included).
The battery compartment terminals protrude through the chassis and can be accessed from the top side. A black acrylic plate is included with the chassis.
This plate holds the motors in place and can be used for mounting your electronics, such as your microcontroller, motor drivers, and sensors.
Assembly instructions are available in the user’s guide under the resources tab.
 

Required Accessories not included

• Two micro metal gearmotors.
  These gearmotors are available in several power options and a wide variety of gear ratios,
  allowing for a customizable combination of torque and speed.
  The Zumo Shield can deliver enough power for all of the micro metal gearmotors we carry, including the high-power (HP) versions.
  Note that some gear ratios are better suited for the Zumo than others;
  please see the Zumo chassis kit product page for specific motor suggestions.
• Four AA batteries. The Zumo chassis works with both alkaline and NiMH batteries, though we recommend rechargeable NiMH cells.
• An Arduino. The Zumo Shield works with both the Uno and the Leonardo.
  It is not compatible with the Arduino Mega or Due, but it can be used
  with older Arduinos that have the same form factor as the Uno, such as the Duemilanove.
   

Motors (not included)

The Zumo chassis uses two motors, one for each tread.
The ideal motors for your robot depend on your desired torque, speed, and current draw, so motors are not included with the chassis.
We generally recommend using HP versions of our micro metal gearmotors since the tracks require a decent amount of torque to move effectively
; higher gear ratios of the non-HP motors might work if you want lower current draw, but they will be slower and offer less
control. Specifically, we recommend the 50:1, 75:1, or 100:1 HP motors for use with this chassis. The following table summarizes the key specifications of these three gearmotors.
The first four columns are specifications of the motors themselves,
while the last column is the measured top speed of a Zumo chassis loaded to a weight of 500 g and driven with these motors.
Note that the specifications are for 6V operation, which is approximately the voltage you would get with four alkaline batteries; four NiMH AA cells will typically provide less than 5V.