How to Measure Your Rims
4- Lug
5- Lug
6- Lug
8- Lug
Measure from middle of two holes directly acorss from one another.
Measure from back of hole to center of second hole.
Measure from middle of two holes directly across from one another.
Measure from middle of two holes directly across from one another.
Center bore
Width
Backspace
Offset
Measure the insides of the bore directly across from one another.
Measure the distance between the two opposing rim flanges from the inside face of the outboard flange to the inside face of the inboard flange, or bead-seat-to-bead-seat.
Lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel.
Measure the distance from the floor to the straight edge and divide by two. That calculates the centerline of the wheel. If the centerline number is smaller than the hub measurement, offset is positive; if it is larger, offset is negative.