I'm 6'6" with the same 38-inch inseam I had in the '60's--my '72 Combat had 6-inch-over forks installed the day I bought it new--I was tired of looking like a parade Shriner on a minibike when campaigning my '62 650SS in Africa.
The Combat now has two-inch rear-shock risers (you have to swivel the oil-filter head on its bolts slightly) and modified Harley shock-lowering forks on the footrest supports to drop the rider pegs about two inches, which keeps my knees parallel to and no higher than the top of the tank.
Normal-size riders straddle the bike with difficulty, but the current setup feels great and handles surprisingly well. I completely understand why professional athletes commission custom bikes with bigger wheels and frames to fill in the inseam and provide a decent sense of proportion
Tim Kraakevik
kraakevik@voyager.net