ORIGINAL: gravediggerracing
MT size means it is a "standard" Tmaxx/Savage size and accepts any Tmaxx/Savage wheel. This is what you want if you have a Maxx, Savage, MGT, etc. 30 series is another sizing method that is its own.
So I assume that the 30 would be bigger than the MT? Compared to the 40's just a size smaller?