Offset is the distance from the centerline of the wheel to the mounting surface of the rim that contacts the hub. An offset of zero would be a rim that has the inside mounting face exactly on center with the centerline of the wheel. A rim with positive offset would have the mounting face positioned towards the outside of the wheel. The stock rims on our cars have a positive offset of 46mm. This means that you could take a wheel off your car and measure from the center of the wheel to the mounting face and it would be 46mm.
Now, if you decide to buy an aftermarket rim, the offset of the rim would tell you how far inboard/outboard the wheel will be when mounted on your car. For a VR4 model, most aftermarket rims that fit the car have a smaller offset than stock (30mm - 40mm). This puts the wheel a bit further outboard than stock and is usually done to keep the "
spokes" of the rim from hitting the brake calipers.
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