I have been told there is a way to adjust the tyre size in VAG Com so that the speedometer is accurate. I have recently changed my 17" alloys (225/45) to 15" steels (195/60). My mechanic told me the steps, which I tried this morning with no luck. Could someone help? many thanks

Depending on the car you can alter the distance impulse number but that is not something I would recommend as you may have an accurate speedo then but the counted mileage may be off.