Just in case it's any help at all but remember I'm no expert...
My car runs on 16" wheels from an XJS, with 225/60/zr Pirelli tyres and drives smoothly and quietly with plenty of grip and nothing fouls anywhere. Speedo is pretty accurate too so overall diameter can't be much different.
The wheels still look quite small though so I may even go up to 17" rims (found some that are sort-of styled along the lines of the old Avon safety rims) and even lower profile, but no wider than 225, tyres.
M.P
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