Editing How to run Ford wheels on a Chevy wheel pattern (section)
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==Bolt Pattern Adapters== Bolt pattern adapters normally fit between the rotor and the wheel. The adapters usually come with pressed in lugs for the new bolt pattern, with a lug length of about 1.5". These can be found on eBay for relatively cheap ($30-50USD per wheel+ shipping) in various materials and thicknesses. Note that you'll need to consider the offset/backspacing of your wheels, and factor in the adapter spacing. Like using non-stock wider wheel rims that have additional negative offset to fit wider tires, when you change how far the wheel centerline is away from the hub, you can (adversely) change the handling of your car. This changes the geometric relationship of the tire's contact patch to the suspension's king pin angle. If the centerline of the wheel rim is too far out, bump steer can become more noticeable and the life of your wheel bearings can be affected. Match the adapter thickness to your wheel backspacing to your intended suspension geometry. The adapters currently on the market range in thickness from 20mm to 3 inches. [http://www.ebay.com/sch/i.html?_nkw=5x120+5x4.5+adapter&_sacat=0&_odkw=5x120+5x114.3+adapter&_osacat=0 5x120 to 5x4.5 adapters on eBay] One thing to consider with really thin adapters (20mm and 1 inch) is that the existing lugs on your hub may be longer than that. If the wheels you are putting on have hollow space in between the lug holes, the existing lugs may protrude into those holes (that's OK). If they don't have space for the old lugs to protrude into, you may have to shorten the lugs by cutting or grinding off the appropriate amount. If your are using thicker adapters, this should not be a problems since the old lugs will be completely covered by the adapter. Because using bolt pattern adapters compromise wheel rim to hub mounting strength, they may not be legal for use in some forms of automotive racing. Some aftermarket wheel manufacturers make wheels having what is commonly called a 'unilug patten' which have elongated lug nut slots, requiring no adapter and allowing swapping between many popular bolt patterns.
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