We have found on the Rocket III that Triumph has built in calibration error in the ECU for the speedometer. It is our experience that the speedometers will read about 7% higher than your actual speed. I know that mine does it.
My question to the forum is does the EFI models of the America/Speedmaster have that same built in calibration error? If the speedo shows that you're running 60 mph, are you really only going 54-55?
We have an older bike with a mechanical speedo and it is spot on with my GPS but my Rocket is not. I haven't had a chance to take the new Speedy out with the GPS to see.
