I know ,the sizing is the only reason that I havent ordered one so far.I would imagine that it would be approx the same as the Trance in terms of sizing,if what you say is right then an 18″ would definately be too small for me at 6ft 2…but I guess its all personal,best thing is for me to get to a shop & sit on one but you know what its like with web deals,you snooze you lose & all that !!!!!!