Dear Andrew & "1560",
at least in the current traditionals the speedometer is easy to re-adjust to the actual tyre-circumference. Just hold the reset-button pressed before & whilst turning on ignition. Then the odometer will read sth. like "021200". Now the first digit will start to flash.
The digit flashing can be set by repeating pressinf the odo-reset button.
The flashing will automatically go through the digit-line then. After having set the last digit the digitrow will jump back to odometer (mls).
For example you will end in "022800" & have a testride, comparing the odometer with a GPS to match.
I´d hope procedure is similar with your Aero´s....
2015 Roadster 3.7
