A very good wheel for robotics applications. I have used this wheel in many of my designs which have won numerous competitions. These wheels are very durable and can take a serious beating. They also provide great traction and are easily modifiable. I would note though that the wheel surface is not perfectly flat, the middle is somewhat higher than the edges. The middle is 2" but the edges are slightly less than 2" so keep this in mind if you need a precise diameter.

Just what I was looking for and at a great price. I did have to modify them slightly to accommodate the casters I was working with, but that is on my end. I've found my Colson wheel resource. Thanks again.