I have a b17 and a B17 Flyer (sprung) I prefer the straight B17. When you hit a bump with the flyer You move up and down 3-4 times at about 1/2 second cycles and it messes up my cadence.Doesn't matter which bike I put it on. Also you have to adjust the nose down so that when you sit and compress the springs it is level. So when you sit down you have to slide back each time to get the correct for and aft position.