I changed the rear two 3 teeth lower than standard (ie 42 teeth from the standard 45) which is the same as going one up on the front.

Acceleration is affected a small bit but not much really. Before the standard gearing would at 70mph indicated only be around 64-65mph on gps, where as now with the non standard gearing at 70mph indicated it will now show around 68-69mph.

Before changing the gearing i couldnt sit at 80mph indicated due to vibs etc etc but not i can sit at an indicated 80mph which is really around 78mph no bother, the vibs are still there but not as much as before.

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Plough on