Originally Posted by
bryangrizzlyohi
Tires must be a tamiya kit tire rather it be a slick radial Hal slick half radial an must be 26mm
Tires are not the problem. It is more of an issue of getting the gear ratio down into the 3.5 to 4.0 FDR for a brushless setup without using non-Tamiya parts which is not allowed according to TCS rules. Of course you can run a silver can 540J in the gt3 class and gearing won't be an issue, but you will need to run against others chassis with 21.5 brushless motors. There is no way a 540J motor is anywhere near the speed of a 21.5, a 25.5 maybe, but not a 21.5.