READ­ING OFF­SETS

NZ Performance Car - - Guide Wheel -

There are two dif­fer­ent meth­ods for mea­sur­ing wheel off­set, the back-space method and the cen­tre-line method, which is the most com­mon. This takes a mea­sure­ment from the wheel’s true cen­tre line to the hub mount­ing face, giv­ing you ei­ther a neg­a­tive or pos­i­tive mea­sure­ment. If you’re lucky there will be a set of stamp­ings on the in­side of the wheels in­di­cat­ing the PCD (ex­plained be­low) and the off­set. The off­set with be a num­ber ac­com­pa­nied by ei­ther ET, P or just the mea­sure­ment (as shown) to in­di­cate a pos­i­tive off­set. Al­ter­na­tively, a neg­a­tive off­set is shown by -ET, N or (-). These mark­ings are com­mon on one-piece wheels, but on two- or three-piece wheels you will likely have to mea­sure it your­self.

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