For Discovery 3 2004-2009 and Range Rover Sport 2005-2009
Menu–Car Config–Instrument Pack–Tyre Radius

For 2010+ vehicles

Only one of the following settings will work and it depends on the car itself. Menu–Car Config–Instrument Pack–

This setting, Tyre Size MSB – IPC

Or this one, Tyre Rolling Radius (mm) – ABS