[Lil' Lavery]

Another vote for both the Versa Wheels (W-tread) and blue nitrile roughtop tread. My favorite two drive systems I've worked with are 116's in 2007, which utilized AndyMark performance wheels with nitrile roughtop tread, and 1712's this year, which uses 4" w-tread Versa Wheels. Both offer absolutely excellent traction.

The Versa Wheels do wear quickly, and should be replaced after each event (at a minimum), but they are dirt cheap, robust, and exceed our performance expectations. Given your low weight, spinning out your drive may result in even faster wear, but I have no data to support this hypothesis.

Nitrile tread tends to be a little more work intensive, as you have to size and mount the treads yourself. Additionally, the wheel options tend to be more expensive, especially once you factor in the tread and fastener cost. But the wear (on carpet anyway) is minimal and the traction results are excellent.