How to; wheel/offset/lug pattern/bore measurement info found this site that can show people how to measure lug patterns, measure for backspacing, wheel pattern info sizes and a lot more info revolving this general subject. people should click on this link and poke around the provided site for info. i suggest this to be a stickie. MRW - How to measure bolt pattern
i like cin's reference picture with waht seems to be a rota wheel, a bride and recaro seat in the background
It's not mine, but the best article concerning wheels and offset. Link is above the pic btw. It's a TE37 for Porsches, a ChargeSpeed and Recaro seat.
Here is a tool i use very often when comparing wheel widths and offsets to either what you have (or what someone else has) to what you plan to get. Wheel Offset Calculator And then same for measuring tires. When you need to know how much wider or taller a tire/wheel combo might be: Tire Size Calculator - tire & wheel plus sizing
Extra old Post but still great info here. Thanks for all the work done up front so I can be informed on my build.