In the US, trikes usually mean recumbents and tricycles are heavy, slow industrial movers such as Worksman There are quite capable of carrying heavy riders. In the UK we still have high performance upright trikes in racing, touring and MTB styles. One of the best builders is Longstaff with their Cyclone model at £750.

Uprights trikes generally use smaller wheels, esp in the rear. 26" MTB wheels are ideal for this purpose and there is no advantage in using 29".