This instructable describes how to make custom silicone tires for a robot, connected together with an axle.
Materials for two tires, connected by an axle:
2 Dry Erase Markers (to use as a mold for the size of the tire)
Paper (for wrapping around the marker to prevent sticking)
Tape (needs to be removable, painters' tape will work well)
Popsicle Sticks (for molding and fashioning)
1 Axel (depends on the drive system of your robot, probably a wooden dowel will work)
Step 1: Prepare the 'mold' for the tire
Cut a paper strip to wrap around the marker.
Wrap the paper around the bottom of the marker, then wrap the tape around the edge of the paper.
This will create a mold to use for the tire and spoke shape, and prevent the Sugru from sticking to the marker.