http://forum.vectra-c.com/showthread...570#post374570 should help. It should be stamped on the back of the wheel. May have something like 7.5Jx18 ETxx 7 being the width, the 18 the wheel size and ET the offset.
EDIT: Beat me to it Jamie! I was looking for that exact pic as I recalled seeing it in another thread - but couldn't find it.
Are they definitely 18s? (daft question maybe), they just don't look like 18s in the pics - could just be a visual thing due to the style of them.
What are the tyre profiles e.g 225/40/18 etc.
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