99 Elise Posted January 22, 2019 Share Posted January 22, 2019 I've been offered some wheels and tyres from a friend, used but with good tread on them. Toyo Proxes T1-R 185/55 R15 82V 205/45 R16 87W I don't really understand tyre sizes and what's OK/not to play with. I know the rears _should_ be 205/50 R16 not 205/45. What are the issues with using these sizes? Thanks Link to comment Share on other sites More sharing options...
Lithopsian Posted January 23, 2019 Share Posted January 23, 2019 Lower profile tyres are smaller than the expected size. Geometry will be affected, but can be fixed for small differences. Speedo will be off since it makes assumptions about how far one rotation goes. In this particular case, the diameter is a little over 3% smaller, which is outside the range usually considered acceptable, and you'll be going 3% slower than the speedo says. Ride height will be lowered by about 10mm, which is definitely noticeable. Lowering only the back isn't normally a good idea. The S1 has a little lift at the rear to start with and you'd normally want to lower the front, if anything. Link to comment Share on other sites More sharing options...
99 Elise Posted January 23, 2019 Author Share Posted January 23, 2019 Ok, great, so I'll decline and look for a better option. Link to comment Share on other sites More sharing options...
jody391 Posted January 23, 2019 Share Posted January 23, 2019 Most now run the 111’s tyre setup. front 195/50/15 rear 225/45/16 Link to comment Share on other sites More sharing options...
99 Elise Posted January 24, 2019 Author Share Posted January 24, 2019 9 hours ago, jody391 said: Most now run the 111’s tyre setup. Thanks, that's what I'll be doing when I buy a set. Link to comment Share on other sites More sharing options...
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