I had a '70 Bonneville many years ago and it ran very well. One day on a high speed test I saw 130 mph on the speedo. Doubting what I saw I took the speedo head into the local Smiths shop ( we had an actual Smiths repair shop in Don Mills at the north end of Toronto ) and asked to have it tested at 70 and 130 mph. It came back about 5 mins later and I was told it read 70 at 70 and 131 at 130 so was accurate. Took it out for another high speed run and crouched over on the tank I again saw 130 on the speedo. I whipped the clutch in and chopped the throttle and it instantly dropped to 114 and then rapidly slowed due to wind resistance. So Triumphs vibrate!! Who knew? Of course Nortons don't vibrate due to their superior patented Isolastic system.