I forget the exact numbers but it's around 12mph give or take. If you watch PP3D in action both in the arena and on our test drive video via our youtube channel you will see what kind of speed they give us on 10 inch wheels running on 8s (around 32v).

As far as bolting wheels on, it's easy. When you buy them if you also buy the aluminium adapter plate that robotmarketplace have then this allows you to use standard sack truck style wheels as one of the outer bolt patterns lines up with the 4 bolts that most sack truck wheels have. Just remember that the threads on the motor are imperial but you can get bolts the right thread form on ebay.

We are moving away from the sack truck wheels as they can't take the abuse that our weapon throws back through the chassis but for a hydraulic crusher or similar they should be more than adequate.