Quote:
Originally Posted by Andy1991
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So will the existing range of wheels for E9x fit on F25?
Is the centerbore the same?.. I am really confused about the centerbore thing I only know it's different from X5/X6.
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The X3 uses a 72.5/72.6 mm center bore diameter. The X5 uses the 74.1mm size. Most aftermarket wheels have a large center-bore and use reducer rings to fit various size vehicles. You can't put a X3 wheel on a X5, but you can go the other way if you get some reducer rings.
The mounting surface offset (ET) is important and changes with the width of the wheel. X3s typically need an ET of 43 (8 inch wheels) to 48 mm (9 inch wheels). You can often get away with a slightly different "ET" but if it's too high you can have contact between the wheel and (typically) the brake caliper, or tire contact with a spring, and if it's too low the tires may interfere with the fender when the springs are compressed. Incorrect offset also produces an off-center load on the wheel bearings that can cause premature wear. Keeping the offset within 5 mm of the factory spec is wise, and using an offset that's more than 10 mm from the factory spec is possible, but certainly is to be avoided if you can.