The RC18 fits into the 1/18th category next season and you are only allowed to run micro wheels in 1/18th.

You can run Rally Blocks on a RC18 at club level but you need 1/10 wheel adapters. To be honest, the wheels and tyres together are too heavy for the car so I wouldn't bother. For club level I'd just get some trued down Gecko's in 35 shore variety which is perfect for that car but you still need 1/10th wheel adapters.

I know Much-More do some 1/18th tyres- http://www.muchmoreracing.com/store/...ex&cPath=36_37 but since the RC18 hasn't run at a national for a while, do we know what tyres are going to be good?