There are several on line calculators on the inter web that show what works best. On the whole "just a little bit" in rev reduction is actually more than changing tyres or wheels will do - but that really depends on what you are trying to achieve.
Use one of the calculators and you are less likely to be disappointed.
Failing that you can quite easily work it out for yourself if you enjoy playing about with numbers.
If you go down the route of changing tyres and wheels, there are other on line calculators that will give you an indication of whether you'll have to hack out bodywork to make your chosen solution fit or not!
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