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Message: <blockquote data-quote="Schwepps" data-source="post: 471694" data-attributes="member: 3592">As Zul says, the ETxx will be stamped on the inside of the rim, whether for originals, after-markets, imis or custom-mades. It's too important a figure for a wheel not to be there, unless it's a real backyard job.You can measure the offset manually; you'll need a long ruler and a tape measure. You'll also need to take the wheel off (you can also check for the stamping then) and dismount the tire. Here's how: <a href="http://www.ehow.com/how_5021837_calculate-wheel-offset.html" target="_blank">http://www.ehow.com/how_5021837_calculate-wheel-offset.html</a>While the wheel(s) are off, measure the hub spigot collar and wheel spigot hole diameter too. Most after-markets will have bigger spigot holes so that the wheels will fit all models that may be interested in those wheels, and to fit them, spigot locating rings may be used. Make sure that the rings (if used) are of good quality. The entire weight of the car and all the stresses of acceleration, cornering, braking and potholes is borne by the spigot and not, as many people think, by the 5 steel studs and bolts that fasten the wheels on the hub. It's a very important safety factor.</blockquote>