here is a good caculator that you can compare the factory wheels/tires and others
Rim & Tire Size Calculator. Custom Offsets - Wheel-Size.com
or
http://tiwing.com/wheel-offset-calculator/
The wheel width and of set should be cast into the wheels. It may be around the valve stem
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
Last edited by JayG; 11-03-2015 at 06:33 AM.
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