RE: Moulding Tyres
Another alternative to molding.
In the past I have taken black boat roller's, you can get them up to 3 1/2" and turn them on a lathe to make the tires. The compound works very well and is easily manulipated on a lathe. You can find the roller's at any local boat supplier.
When you are done put the tire in a bowl of water put in the microwave for 1:30 min this will soften the rubber to put them on . Wear some kind of glove's it will be hot.
I like the ideas in this thread and thought I would share one of mine.
Tim D.