The Nightster was one of the Sportsters I was considering but from what I have read has a horrible harsh ride and too small a fuel tank for any amount of distance riding and the other I was considering was the Roadster which was just about right except I probably would have had to lower it for my wife to ride comfortably, it now has a larger fuel tank for 08. I'm hoping the seat height on the Speedmaster will suit us both, she is 5'5" and I'm 6'2".
