HOW TO MEASURE!The widest point of your tire and wheel combination is usually the outside diameter of the tire sidewall. Using a ruler with the straight edge flush with the face of the tire, measure the gap between the outer face of the tire to the inside lip of the fender as shown in the diagram. This will determine the thickness of the spacer you will need. 5MM = 0.197 INCH / 8MM = 0.313 INCH 10MM = 0.393 INCH / 12MM = 0.473 INCH 15MM = 0.590 INCH / 20MM = 0.787 INCH 25MM = 0.983 INCH / 30MM = 1.181 INCH 38MM = 1.496 INCH / 50MM = 1.968 INCH
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