These wheels come in sets of 4 and require some basic assembly. A small hex wrench is included with each wheel set. These will mate directly with the micro gear motors. If using it with other motors, you can easily drill out the hubs to accept larger shafts.
Notes: For the best performance, there a few things you should know. The wheels might need a little lubrication to get the rollers moving well enough for lateral movement. Some basic grease works well. Since lateral motion relies on the motors moving against each other, you will get the smoothest lateral movement when the wheels are traveling at the same speed. The use of encoders (or some feedback loop) is recommended. Lastly, making sure your robot platform is balanced helps tremendously as well. Too much weight in the front or back can cause poor results.
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