aussie - in Malaysia a lot of people run their 46 2Cs on a 10x6, its great for speed but it will kill the engine soon. I used to have the 12.25x3.75 but then I found that an 11x5 will give me more revs and the throttle seems more linear and the engine is more responsive. The CAP with a SA82 on 25% nitro and a 14x6 will be loads of fun!