The wheel specs should be stamped on the backside of the wheel. 20mm spacers could work depending on your wheel and tire specs though. Some people just don't like running spacers that large.
Originally Posted by Stotty
I have the Mv4 225m 19" bmw wheels not sure on the offset of these but im sure one of you bmw boffins
will know haha
On a side note, I just learned what this term meant not too long ago. I was watching an old Top Gear episode and Jeremy Clarkson called Jeff Goldblum that haha.