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I have just got a set of TSW alloys for a song, complete with bolts and 2-off spigot rings, 2-off thin spacers. Running a W/B 155 2.0 16v, currently 6.5Jx15 ET37. New wheels are 7JJx15 ET30. My basic maths tells me 1/2 inch = 13mm(ish), therefore ET37-ET30 being 7mm from that 13mm, the inset should be almost the same, so no clearance probs??? If so, would the spacers have been on the rear or front?? If only 2 spigot rings are they front or rear??
FYI will still be running 205/50 tyres. Seeing as many owners have changed to 16s and 17s, I wondered what problems had arisen. I am aware the 2.0 16v w/b has a different track to 1.8 and V6. (just changed the wishbone.....)

 

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Many thanks for reply, you are 100% right and I have located (sic) the other rings - albeit fitted inside out........ Also as for spacers I reckon they were because the wheels were originally fitted to an integrale 8v, which had an offset of ET30. Anyhow, after all this, I may not be using the wheels after all, seeing as I have hit a lean patch. See classified section.