[RogerR]

<R13>

Robot wheels, tracks, and other parts intended to provide traction on the playing field ("traction devices") may be purchased or fabricated. In no case, will traction devices that damage the carpet or other playing surfaces be permitted. Traction devices may not have surface features such as metal, sandpaper, or hard plastic studs, cleats, or other attachments. Anchors, i.e. devices that are deployed/used to keep one’s robot in one place and prevent if from being moved by another robot, cannot use metal in contact with the carpet or other playing surfaces to "stay put." Gaining traction by using adhesives or Velcro-like fastener material is not allowed.

i don't see anything in the rules that outlaws wooden wheels, but you might want to put some sort of soft "tire" around the outside of the wheel just to be on the safe side.