Q:

# How do you measure wheel offset?

A:

To measure wheel offset, first determine the wheel's width, and use it to find the wheel's center line. Then, measure the wheel's backspace, and subtract the wheel's center line from it. The wheel offset could be positive, negative or zero.

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To measure the wheel's width, use a ruler or measuring tape to measure the distance between the inner edges of the flanges. Round the measurement to the nearest half-inch. Now, divide the wheel width by two to obtain the wheel's center line. Normally, the measured wheel width is greater than the one advertised.

To measure the wheel's backspace, place the wheel with its backside facing up on the ground. Lay a straight edge on the wheel's inboard flange so that it is diagonally across the latter. Then, measure the distance from the point of contact between the edge and the inboard flange to the point of contact between the edge and the wheel's hub mounting pad.

Subtract the wheel's center line from its backspace. If the calculation is negative, it implies that the wheel has a negative offset. This indicates that the wheel's hub mounting is nearer to its backside. If the calculation is positive, it means that the wheel has a positive offset. This indicates that the wheel's hub mounting is nearer to its front side.

If the calculation is zero, it implies a neutral offset and indicates direct alignment of the wheel's hub mounting and center line.

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