I have not noticed any vibe patches and I have ridden up to 90mph. At 70mph you are at approx 4000 revs which when you consider the bulldog red lines at 6500 revs then the engine is as smooth as you like. Riding at 0-50 should be no problem and the bike is unbelievably economical at over 50mpg. One issue is that the bike is heavy at 230kg and this is only a problem when moving the bike within a small space etc., once on the move you do not notice the wieght.