Porsche Boxster Owner's Manual page 153

f Select "Continue" and push the operating lever
forward.
f Select the appropriate tire size (17, 18 or 19
inch) and push operating lever forwards. A dis-
play for confirming the selected tire size ap-
pears.
Note
This menu is displayed only if the tire pressures
are different for the approved tire sizes.
f Select "Continue" and push the operating lever
forward.
Instruments, On-Board Computer, Warnings
151