I'm 5'11" /32" inside leg.I was more comfortable on my GS12 with the Cast Wheels and the Std seat on Low Setting.However,i now have 17" Wheels on the Bike and the seat on the High Setting.A decent Dealer will have a Demo Bike for you to try,get them to set the seat on the Low setting and try it.It's easy enough to raise the setting while you are out and you'll get the feel for which set up suits you best.I know it sounds obvious,but wear the kit that you would expect to wear if the bike was your own.You will really get the feel for how it suits you.