PCD and offset

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    psbarham
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    PCD and offset

    Post  psbarham on Mon Jul 12, 2010 2:36 pm

    if you are struggeling to understand what PCD is , or offset is when you are buying new wheels then hopefully this will help you out a bit

    PCD stands for Pitch Circle Diameter
    OFFSET is often referred to as ET which stands for EinpressTieffe in German

    PCD first , wheels come with a variety of fitments for different viechles , 3 stud , 4 stud , 5 stud , and even 6 stud (this is normally 4x4's and vans)



    3 stud - Measure the distance X between the centres of 2 holes and multiply by 1.154



    4 stud - Measure the distance between the centres of 2 OPPOSITE holes or Measure the distance between the centres of 2 ADJACENT holes and multiply by 1.414



    5 stud - Measure the distance X between the centres of 2 ADJACENT holes and multiply by 1.7012



    6 stud - Measure the distance between the centres of 2 OPPOSITE holes or Measure the distance X between the centres of 2 adjacent holes and multiply by 2

    now for offset , different wheel/car combinations need different offsets to deal with suspension design etc the lower the offset is the more the wheel will stick out , but then runs the risk of shredding the tyre on the wheel arch , the higher offset means the tyre will clear the wheelarch , but is then closer to the suspension
    positive offset


    negative offset


    Most wheels in use today for passenger car purposes have a positive offset. Most 4 x 4 vehicle have zero or negative offsets. Just because a wheel from one vehicle has the same PCD and offset as the wheel from another does not mean they are interchangeable - the centre bore of the wheel and hub must also be the same to ensure centralisation of the wheel, and the shape of the spokes must ensure clearance of the brake calipers. Many manufacturers use the same wheel fitments as others, but some are unique , so take care to research carefully before you pay out your hard earned spondoolies . and as always if you don't know ASK Very Happy

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