[Jared Russell]

We often use a box cutter or razor blade (along with a clamped-down straight edge) to cut our tread to length and width. It isn't too difficult.

Based on qualitative observations (and a few quantitative experiments), blue nitrile outgrips Colson wheels on carpet (particular with wide, small diameter wheels), but on HDPE and polycarbonate surfaces, the Colsons grip a bit better. Adding custom tread patterns to the Colsons supposedly closes the gap with roughtop tread on carpet.