The best choice of class for you may also depend on you size. TKM is a great class and you get quite a bit of life from the tyres but the engines need re-building fairly often when compared to rotax, but then rotax tyres don't last long! (neither do several other parts of the kart as it can be pretty rough class - TKM drivers tend to have better manners on the track lol)
if you weigh over 85kg then rotax would be the better choice as there are two weight divisions to accommodate different sizes of drivers - this is something not available in the TKM class. Formula Blue is another option but i have no experience of this class so cannot comment. as already mentioned by another, your best bet would be to come down to watch at the weekend and get chatting to people to find out what is the best class for you
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