Wheel Arch Height

Park the vehicle on a level surface.
Empty the vehicle so that it is at "curb weight". (Empty the luggage compartment, load the spare tire, jack and service tools, and fill up the fuel tank.)
Set the steering wheel in a straight-ahead position, and stabilize the suspension by moving the vehicle in a straight line for 5 m (16 ft) or more.
Suspend a thread from the wheel arch (point "A" in the figure below) and affix at a position directly above the center of wheel.
Measure the distance between the point "A" and the center of wheel.

Fig 1: Measuring Distance Between Point "A" And Center Of Wheel
Courtesy of SUBARU OF AMERICA, INC.

Wheel arch height specification mm (in) (Tolerance: ^{+12 mm}_{-24 mm} (^{+0.47 in}_{-0.94 in} ))
Tire size	P205/60R16 P215/50R17	P225/50R17 225/45R18	P225/60R17 P215/70R16
Front	403 (15.9)	395 (15.6)	469 (18.5)
Rear	392 (15.4)	387 (15.2)	474 (18.7)