Sorry, 30 tooth transmission pulley! I thought that by changing the pulley the bike will actually go a bit slower than the speedo shows (about 4 miles if I remember some of Doc's posts).csoday said:I may be wrong about this (I'm not at home to check)but I believe the speedo signal is picked up at the tranny output shaft. So your reading should be correct. Wait a minuet, which sprocket did you change. Comp sprocket or belt sprocket. If you are talking drive belt drive sprocket, you did change but there is a way for the dealer to re-cal the speedo.