How to Measure
4, 6, and 8 Lug Bolt Patterns
Measure from the center of one stud hole directly across the center of the wheel, to the center of the opposite hole (see diagrams) measurement should equal the bolt circle diameter.
5 Lug Bolt Patterns
Measure from the center of one stud hole, skipping the adjacent hole, to the outer of the furthest stud hole.
Wheel Size & Back Spacing
To measure wheel size and width, start with diameter (D) go from inner lip to inner lip. Width (W) is also inner lip to inner lip. Back spacing or offset (B) is found by placing a straight edge along back of wheel and measuring from center to your straight edge (see diagram)
Measuring Front Clearance
When measuring front and rear fender/body clearance first remove the wheel from the car, measure from the face (or front) of the rotor/drum to a straight line down the edge of the fender (F).
Measuring Rear Clearance
Also Measure clearance from the body to a straight line starting at the front of Rotor/drum (I). For the rear repeat measure from face of drum/rotor to straight line of edge of the fender (O).
Measuring Caliper Clearance
To measure disc brake caliper clearance (A), measure from edge of mounting surface to edge of brake caliper. To measure hubcap clearance (B), measure from edge of mounting surface to edge of dust cap.