mjs4x4
A2OC Donor
I have just changed the wheels on my Sport from the 17" with 205/45 tyres on to 16" with 185/50 tyres on.
I figured that the tyres will have a different circumference and so the speedo/milage recorder will now be a little inaccurate.
I measured the circumference of the two tyres (because I was not clever enough to calculate it). The 17" wheel/tyre was 74" and the 16" wheel/tyre was 72.5".
If the speedo/mileage recorder reads from wheel revolutions (as I assume it must) the readings will be 2% inaccurate - doing 98mph when reading 100mph (I wish)!
Right or wrong?
Can you use the VAGCOM to correct this - just set the computer to calculate figures on the 16" wheel/tyre combination?
Mike
I figured that the tyres will have a different circumference and so the speedo/milage recorder will now be a little inaccurate.
I measured the circumference of the two tyres (because I was not clever enough to calculate it). The 17" wheel/tyre was 74" and the 16" wheel/tyre was 72.5".
If the speedo/mileage recorder reads from wheel revolutions (as I assume it must) the readings will be 2% inaccurate - doing 98mph when reading 100mph (I wish)!
Right or wrong?
Can you use the VAGCOM to correct this - just set the computer to calculate figures on the 16" wheel/tyre combination?
Mike