Re: Reducing Vibrations at High Speeds.
I also hear that the 70's vibrate much more than the 50's. Can't confirm though, as I've never ridden a 50. It also depends on where you get your motor from, as quality can vary.
I had straight bars and the vibration was killer. So I got some big riser bars and it was way smoother. Then the cheap bar bent so I went back to the straight bar...vibration sucks.