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99 Elise

S1 Elise, can I use 205/45 R16 87W on the rear?

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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

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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.

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Most now run the 111’s tyre setup.

front 195/50/15

rear 225/45/16

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