As in the title really, been looking into wheel offsets etc for a while now and there are a lot of links and websites around, but found this one which does for those , inc myself, who find the whole subject a tad perplexing, make it a lot clearer, inc spigots rings etc etc. maybe old news for those in the know but thought it may help us mear mortals. attached is the info and the weblink at the bottom of this thread. rob http://www.rimstyle.com/pages/alloy_wheels_explained.html
I use this site which is quite good when comparing a new wheel to your existing ones http://www.willtheyfit.com/
Will They Fit is super useful. I'm sure I use it at least once a week when constantly looking at new wheels