Triumph motor cycles in the 1960's and 70's were always reckoned to have the most accurate speedos,typically reading less than 1 mph slow at 60 mph, probably due to Triumph supplying the Saint [Stops Anything In No Time] 650 to police forces wordwide, if you rode a Guzzi Le Mans [I wished I did] at an idicated 80 mph you wouldn't qualify for a speeding ticket in a 60 zone!
