Resources
Tiresize.com
Wheel Offset Calculator
Use this calculator to determine the effect of changing your wheel width and offset. It will show the clearance between the inside of the wheel and the strut housing. It will also show how far the outside of the wheel edge will extend or retract.
wheel-size.com
Wheel Fitment Database
Specify the make, year and model to find matching wheels for your vehicle.
Tiresize.com
Tire Size Comparison
Compare metric or inch tire specs side by side and view with this tire visualizer. It will also display vehicle speedometer error and available alternate tire sizes.