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If you're getting new rims...

Use this tool:

http://www.1010tires.com/WheelOffsetCalculator.asp

Stock width is 8 inches and offset is +40 mm. Punch in your new width and offset to see what the changes in inner and outer clearance will be.

If you're getting new tires...

Use this tool:

http://www.1010tires.com/TireSizeCalculator.asp

You can just put in the MAKE then YEAR and finally MODEL... or you can manually punch in these numbers:

For the 18" rims:
TREADWIDTH: 265 mm
PROFILE: 60
DIAMETER: 18

For the 20" rims:
TREADWIDTH: 265 mm
PROFILE: 50
DIAMETER: 20

Then punch in the new tire sizes and click on COMPARE TIRE SIZES. Remember to try to get as close as possible to stock and don't go past 3% difference in size. Also, do not mix and match different sizes front and rear if you have AWD as the AWD system will go crazy if you have 2 different sizes front and back.
 

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Re: Want new tires or rims? Look here first.

Here's one more tire/rim size calculator, but this one actually has pictures to show the comparison between two differet wheel or tire sizes. Pretty helpful for people like me who are visually oriented. :mrgreen: This is one of the best calculators I have seen.

http://www.rims-n-tires.com/rt_specs.jsp
 
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