[EricH]

Some teams buy pneumatic wheels and modify them to interface with AndyMark or IFI sprockets. 330 goes through several sets a season, just because they drive them so much. Figure 2 sets of pneumatic caster tires per season, for competition only, and a third set in the offseason. And that's only the competition robot! Then again, that's better than blue nitrile, which may have to be replaced once a competition at minimum.