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The wheel bolt pattern for the 2009 Chevy Impala is 5 X 115mm. If you're replacing your wheels, make sure the new ones have the same bolt pattern or they won't fit without a wheel adapter. Wheel adapters are handy for changing bolt patterns to match the hub of a different vehicle. To determine the 5 lug bolt pattern, measure from the back of one hole to the center of the next hole. Most wheel sellers provide easy-to-find wheel specifications. Some wheel packages list the center bore specs, and you can usually find this information on wheel manufacturer websites. Check there to find the center bore of your wheels.
The 2009 Chevy Impala has a wheel bolt pattern of 5 x 115mm and an offset of 47mm.