03-20-2014, 09:27 AM
This is one of the smoothest I4's I've owned and I have owned quite a few, three at present. I would just say the vibration, compared to any I4, is unremarkable, and definitely on the smoother side of the spectrum, especially at cruising speeds. I expect the new six-speed box to be even smoother as the RPM's are a little lower. The new Interceptor, though, might be the ticket for you as the Honda V4 tends to be very nice all the way around.
