Wheel Arch Height

Park the vehicle on a level surface.
Empty the vehicle so that it is at "curb weight".
NOTE: Empty the trunk or luggage room, 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.

Courtesy of SUBARU OF AMERICA, INC.

Model	Tire size	Wheel arch height specification mm (in) (Tolerance: ⁺¹²^mm -24 mm (⁺⁰⁴⁷ⁱⁿ -0.94 in))
Model	Tire size	Front	Rear
WRX model	235/45R17	375 (14.76)	367 (14.45)
WRX model	245/40R18	370 (14.57)	361 (14.21)
STI model	245/40R18 245/35R19	370 (14.57)	362 (14.25)