Let's Make Robots!

tires

Need sugestions on tires for my robot

Hey everyone, I am building a sumo bot and I want to make the wheels myself out of wood, now, as some of you may allready know, a sumo bot requires good traction and that is something that wooden wheels bring to the table, so here is my question, what are some good things to put on wheels that are like tires.

 

P.S I have allready thought about using rubber wristbands but as the dimensions of the wheel are 4cm diameter and 1 cm wide, this is not a possibility. 

GMPWs

does anybody want to trade a pair of yellow GMPWs for a pair of black?