Think I've posted on this thread before ..
WORM run a Rallycross championship for micro's indoors on polished floor and carpet, running Mini's and Mk2 Escorts .. and its flippin ace
Usually we use foam tyres but the best racing is when using inner tube donuts stretched over the foams = no grip !!! kinda has the feel of running a powerful group B rally car on gravel ..
This what we run ...