I'm sorry I'm late to this thread,but...the KHS Flite747 IS different from other, XXL frames.It was designed around a crankset with 200mm crankarms. These are an inch, or more, (30mm, actually) longer than "normal"(170mm) arms, and necessitate an elevated bottom-bracket, and revised geometry, in order to regain pedal clearance when cornering. Chaadster recommended you look up Lennard Zinn, I second his recommendation. Lennard designed the 747 for KHS. He has much experience building big bikes for big guys, like us. If you want a drop-bar road bike, the 747 is in a class by itself. (Or you can buy custom, $$$$). Maybe you want a mountain bike? KHS offer their BNT 29'r (Big 'n Tall). A hard-tail (rigid frame, suspension fork) flat-bar MTB, also in 2XL and 3XL. You can check it out at KHS' website( /mountain bikes/29/BNT).
I apologize if this post reads like an advertisement for KHS, but I have a 747 and like it a lot.