I have zero idea of what dimensions the alloys are. Running 18s at the minute but thinking of picking up some 17s for track days. What are the key numbers I need to know when I go ask the man about a set? Follow up, what size tyres suit the 17s then that won't mess up my speedo?
Have a look on Clio197.net to see if there's any OZ Ultraleggera for sale. They're 17"x8" and ET55 you'd need 225/45R17 tyres (nice common/cheaper tyre size than some too which is good.)
I run 17x8 ET55 OZ Alleggerita HLT with 235/40/17 If you're going to keep the 18s for the road I'd get some 235/45/17 DZ03G for track tyres. That size is closest to the standard 235/40/18