Yellow Rubber Wheels with a diameter of 3.7cm.

Kit Chassis Romi from Polulu. Ideal for those who want to develop a remote controlled robot car, line follower, fire engine, etc.

Bracket Pair for Sharp GP2Y0A02, GP2Y0A21.

The Chassis for Robot from 5" RRC04A is a Chassis from Acrylic of 1/8" that provides a base for our 42x19mm gear motors, brackets and wheels. The Chassis of the Robot has many mounting holes that allow you to mount a variety of components on it. With a diameter of just five inches, this Chassis made of Acrylic is great for building robots capable of navigating tight spaces.

Pololu Wheel 60×8mm Pair - White

This acrylic expansion plate lets you mount a variety of components to your Rover 5 tracked chassis. The 3 mm wide slots covering the plate support many configurations of sensors and other robot components.

Tamiya’s steel-ball caster is a good way to give a “third wheel” to a small robot powered by a differential drive. The kit comes with enough parts to make two casters, either 25 mm or 35 mm in height.

Do you find the world of robotics interesting? It's very easy to create a robot! With this 2WD Round Chassis for Robot Cart, a microcontroller (Arduino), some sensors and programming you will be able to develop the robot of your dreams!

RobotFrog

2WD 2+1 Wheels Robot Chassis Kit for the Arduino platform. Ideal for those who want to develop a remote controlled robot car, line follower robot, fire truck, etc.

Shield Bot is an easy-to-use, entry-level robotics platform that helps you get into the world of robotics. With this kit you can build a line follower robot in a few minutes using the library and code provided.

The Shadow Chassis is a marvelously durable and modular robot platform from RobotZone. 

Kit Tank Tracks DIY Chassis. Ideal for those who want to develop a project with Arduino.