I tried the 1:8 scale on road radial tires from Ipanema and it was awesome.
No worries about ballooning up and it grips pretty good too. I was running a OCM Evo with a 43/20 gear combo on a MMM V3, 5S Polyrc, 1515 2700kv. No more worries about the foam coming out of the tires. It cost 30.00 for a pair of tire and wheels. I highly recommend it for high speed passes.