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Thanks for the replies.
RE: "...you are trying to keep a similar rolling diameter so as not to alter the gearing?" Yes. But now that I think about it, the car has relatively tall gearing after changing the diff (3.9 changed to 3.3) so 14s with a 50 aspect ratio tyre could help lower the gearing.
RE: "Can you buy lighter rims?" Yes, that is an option. (Comes at a cost of course.)
Something else I just thought of is that there are still a few choices in 15" semi slicks but not much choice in 14s. Nankang make the AR-1 in a 14, but only as 185/60 x 14.
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