I am 6'-3" and the Corbin seat was such an improvement over the stock seat, I can't remember if it moved me forward or not. The bottom line is that the Corbin seat with the adjustable backrest is awesome. Keep in mind that it will take a while to break in, they are VERY firm. Once the seat is broken in (at least 1,000 miles) you will love it. I can go the limit of the fuel onboard without stopping and have ridden 8 hours in a day without a problem. I would have to sit on a stock speedmaster to be sure, but the ergonomics did not seem to change at all with the seat.
