offset calculator?

[mndsm]

Anyone know of a good way to calculate offset, or a formula I can use to determine how big a wheel/tire combo I can stuff under my car? I'm hoping to get a set of wheels this spring, and in my crazy pursuit for being a PITA and doing things the hard way, I want to step down to a set of lightweight 17's. They're generally cheaper, a lot lighter than the cast 18's that came stock on my car ( 07 ms3 for those interested) and I can run way more tire with the clearance I'll get. Just trying to figure out/juggle some numbers and see how wide I can go before I run into rubbing issues. I know I've talked about it enough, and I wanted to put it into a thread, in case anyone else ever thinks like me.

[dmention7]

search noob! :D

http://www.mnmazda.com/forum/showthread.php?t=1283&highlight=wheel+calculator

[Slim]

For figuring out tire sizes from stock to aftermarket this one is a great tool as well. You get a good visual idea of tire selections compared to stock and there impact on speedometer etc.

http://www.miata.net/garage/tirecalc.html

[Workdawg]

http://tinyurl.com/6n53xa

[dmention7]

Bah, if you're going to LMGTFY someone, at least get the search terms right :p

[spek1098]

MSF tire-wheel-calculator thread (http://www.mazdaspeedforums.org/forum/mazdaspeed-3-6-wheels-tires/262-tire-wheel-calculator.html)

[YSOSLO]

Thanks for putting up that link Jurgen, but now I'm obsessed with playing around with different wheel and tire sizes which is probably going to convince me I need bigger (read: more expensive) wheels and lower profile (more expensive AGAIN) tires. I wonder if Tom has figured out how to get 20s on his car yet...lol