Ped90: My wheels are HPI superstar MT wheels with tamiya stadium racer tarmac tires, works great on tarmac and pavement! They do need a stronger servo though.. since theyre wider. Bought them from a local vendor but they should be available almost everywhere.
Naturefreak got some other road wheels (page 57), check them out or visit your LHS to take a look whats on the market. Just remember your LHS will charge you twice as much as a netshop.. Hope this helps! have fun with your car!