Stock Subaru wheel offset is between +45mm to +53mm. The +48mm combined with the 8 inch width will push the wheel outside of the wheel outward about 12mm (~.5″) from the center of the vehicle.
What is wheel offset?.
• The offset of a wheel is the distance from its hub mounting surface to the center line of the wheel.
Zero Wheel Offset.
• The hub mounting surface is in line with the center line of the wheel
Positive Wheel Offset.
• The hub mounting surface is in front (more toward the street side) of the center line of the wheel.