Step 1: Measure the wheel gap of your vehicle.
The wheel gap is the amount of space between the inner fender lip and the outside edge of your wheel tires or rims, for example, 12mm. That means you can add 12mm wheel spacers (or below) without rubbing.
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Step 2: Measure the PCD & CB of your vehicle.
The bolt pattern(PCD) refers to the diameter of an imaginary circle formed by the centers of the wheel lugs, for example, “5×112 mm”. The center bore(CB) refers to the diameter of the hole in the center of the vehicle hub and wheel, for example, “66.5 mm”.
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Step 3: Figure out the thread pitch of your vehicle.
Make sure the thread of the bolts fits your vehicle. Giving an example, if your vehicle use M14x1.5 bolts, then choose spacers with M14x1.5 bolts. If you need extended bolts, then the thread lenght should be the thread length of stock bolts + the thickness of spacers.
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By measuring the wheel gap, bolt pattern, center bore, and thread pitch, you can figure out what size of wheel spacers do you need. Giving an exampe, wheel gap = 12mm, PCD&CB = 5×112 & 66.5, thread pitch = M14x1.5, then you should buy 12mm 5×112 66.5 wheel spacers with M14x1.5 wheel bolts. Hope this guide would help you.