I just bought 2 new sets of tires for my buggy. The Pro-Line Slingshots (paddles), and the Ofna Pulsars (knobby). The tires are made of such a soft rubber that the paddles and the knobs just fold right over. There is no way they could get traction, maybe on asphalt, but never sand or dirt. They might as well be made of paper. I don't recall the tires that came with the buggy being this soft.

Does anyone know of a way I can harden up the tires? I suppose what I want to do is age the rubber.

Thanks