[BDG]

I ran a tuned Blackbird at Bruntingthorpe and the speedo would show 205 to 210mph but through the timing lights the best was a genuine 186mph.

Same story with Kwak ZX9R, ZZR1100 and even a Honda VFR800 indicated nearly 170mph! which was a true 156mph.

All the speedo's that day were roughly 10% over.

Just to compound matters i had an ST4 that rarely showed more than 130 when other people would be showing upto 160mph. Speedo's on ST4S and 996SPS always seem to read less than friends bikes so maybe Ducati speedo tell fewer lies.