I posted the link to d/l my spreadsheet for a reason. After I went +2 I needed a correction factor of -12.479 to get my speedo/odometer back on target. Its pretty damn close now.crash gordon said:
If I add 2 teeth to the rear sprocket how much is this likely to knock my speedo out?
I imagine it will be over-optomistic to begin with so am I likely to be out by much?