[Kevin Ray]

We've used pneumatic tires in 2002 and several other years but those were the best tires/wheels yet. They were small so there was little bounce, yet great traction. The fact that they were pneumatic also lent itself to correct for leaning and imperfections in the carpeted surface--four wheels were always gripping. That was the year when 71 Hammond Beatty had the crawler which dragged the two goals with the opponents kicking and fighting to the other side of the field--so traction was paramount.

Here's a link. At the time everyone made their own hub mounting plates. The following year, FIRST came out with hubs in the KOP. Two large fender washers with the holes bored out with the use of standoffs sandwiched in between worked well for many teams.

http://www.skywaywheels.com/products/caster/index.html