[dougwilliams]

Is the plan to rely on the weight of the wheel to keep the wheel in constant contact with the ground? I was looking for some sort of spring device for that purpose. Even without binding as noted by nuclearnerd, I would be concerned with it "skipping" and sliding along the wheel direction rather than rotating.

But it is a nice design, our team had considered some way of using a tracking wheel for measurement last year and didn't go through with it. We were accurate enough on Mecanum wheels, and timing alone (with gyro angle corrections) to do a 3-stack autonomous.