Alloy Wheel information and research

Hi, I already have a successful website ([login to view URL]) and I would like to include more detailed information. The site is about alloy wheels and what alloy wheels can fit what car, it includes some specifications that users can view to see if the wheels they are getting will fit their car. I am looking for a document/report that I can include on the site that explains alloys wheels, they way they are sized and why, the differences between different alloy wheels, manufacturers differences etc. Some of this information is ALREADY on the site (will need further detailing). I am looking to expand the information to make it MUCH more comprehensive and detailed and should include information about tyres (how to read them, what the numbers mean, speed ratings etc.). This should be intereting for anyone already interested in alloy wheels (EUROPEAN CARS ONLY), and be able to graphically structure and compose a great document.