Ok, so I have read plenty of threads about the speedo being off on pretty much every bike. My dads Harley is an exreme case, its off about 25-30%... However, my bike is dead on. Ive checked it at 35, 55 & 75mph with both a GPS and with my dad pacing me in his car. I guess its just a fluke and I should consider myself lucky?.. Just sayin.