P Metric
With the P-Metric system, Section Width is measured in millimeters.
To convert millimeters into inches, divide by 25.4. The Aspect Ratio (Section Height divided by Section Width) helps provide more dimensional information about the tire size.
Example:

(1) P = Certain tire type used on light duty vehicles such as passenger cars
(2) Section Width in millimeters
(3) Aspect Ratio (= section height 7 section width).
(4) R = Radial Construction
(5) Rim diameter in inches
See also:
Driver’s Control Center Differential (DCCD) (STI)
Always use the utmost care when driving. Being overconfident because you are driving a vehicle with a driver’s control center differential could easily lead to a serious accident.
All the ind ...
Warning light
Warning light
All the indicator lights will flash in the event that the driver’s control center differential has a malfunction. Have the vehicle inspected by your SUBARU dealer. For details, refer to ...
Stereo indicator
The stereo indicator “ST” (type A, B and C
audio)/“STEREO” (type D audio) will
illuminate when an FM stereo broadcast
is received. ...
