Original Porsche alloy wheels however use a This is when the surface of the bolt that touches the wheel is straightĪnd tapers in towards the thread. Touches the wheel is slightly curved or bowl shaped. ![]() This is when the surface of the bolt that Wheel nut) can be either a tapered or radius seat. Thread Size and PitchĪre either 12mm (M12) or 14mm (M14). A lot of wheels come complete with bolts (or nuts), but this is not a guarantee that they are suitable for your car. PCD and Offset are correct for your purpose, then you’re ready to order a newĪnother thing to watch out for is the type of bolt you are going to use. A wheel with negative offset (-) will push the wings outside of the wings away from the bodywork.ĮT is commonly used when talking offset, this is from the German “EinpressTiefe” which translates as insertion depth. ![]() A wheel with positve offset (+) will tuck the wheels inside the front wings and closer to the bodywork. Mounting surface is even with the centre line of the wheel. Mounting surface is toward the back or brake side of the wheel (deep dish). Mounting surface is toward the front or face of the wheel. Offset is measured in mmĪnd results in a positive, negative or zero offset. Hub mounting surface to the centre line of a wheel. The top bolt to the lowest point of the arc in a circle. Measure as the bolt holes are opposite each other. So a standard late Beetle steel is a “4 x 130” for example. The PCD is referred to as the amount of holes x the diameter, Wheel PCDĭiameter and is the diameter in mm of a circle drawn through the centre of The wheel PCD and Offset so that you know they are going to fit your car. Wheel may foul on the bodywork or stick out too far outside the wheel arch. Match the PCD of the hub, the wheel bolts will not line up. ![]() When fitting aftermarket or non standard wheels. Offset is theĭistance of the hub mounting surface to the centre line of the wheel, see below Holes in the wheel and the width apart of the mounting holes.
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