Speedo recalibration

[Flash Gordon]

I changed the sprockets on my bike, does anyone know how to correct the speedo?

[MET]

Other then a yellow box or new calibrated face plates checked against a GPS unit no. You may be off furter with new gears or closer. What ratios are you using?

[Flash Gordon]

I went 1 down in the front and 2 up in the rear. The worst thing about it is the odometer counts faster too.