There has been some debate on what tyres fit on what size rims.
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I am fortunate enough to have acces to the ETRTO manual, this manual is written by the European Tyre and Rim Technical Organisation and is used by all manufacturers of full vehicles, rims and tyres.
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It covers everything from earth moving equipment to space savers and from 18 wheelers to motorbikes.
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The Manual contains guidelines for fitment, which includes clearance envelopes that manufacturers use when packaging the wheel and tyre
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(these envelopes cover all known tyre deformations and fling), load ratings, speed rating, tyre and rim construction and of course what size tyres fit on what size rims.
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Of course it may be possible to stray outside these guidelines but the tyres wil not be working within their design parameters
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(same as running very low pressures for example) and a correctly fitting and functioning tyre will always give better results.
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I will post up some popular sizes for MR2's, in 15-18 inch, as well as the recommended ETRTO size combination, if you would like more information or I have missed some sizes feel free to ask, I hope its of some use!
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55 profile
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195/55 x 15
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5.5j
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- 7j
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Recommended 6j
205/55 x 15 and 16 5.5j
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- 7.5j Recommeded 6.5j
225/55 x 15
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6j
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- 8j Recommended 7j
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50 profile
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195/50 x 15
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5.5j
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- 7j Recommended 6j
205/50 x 15, 16 and 17
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5.5j
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- 7.5j Recommended 6.5j
215/50 x 15,16,17 and 18 6j
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- 7.5j Recommended 7j
225/50 x 15, 16 17 and 18 6j
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- 8j Recommended 7j
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45 profile
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195/45 x 15 and 16 6j
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- 7.5j Recommended 6.5j
205/45 x 15, 16, 17 and 18 6.5j
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- 7.5j Recommended 7j
215/45 x 15, 16, 17 and 18 7j
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- 8j Recommended 7j
225/45 x 15, 16, 17 and 18 7j
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- 8.5j Recommended 7.5j
235/45 x 15, 17 and 18 7.7j
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- 9j Recommended 8j
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40 profile
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195/40 x 16 and 17 6.5j
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- 7.5j Recommended 7j
205/40 x 16, 17 and 18 7j
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- 8j Recommended 7.5j
215/40 x 15, 16
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, 17 and 18 7j
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- 8.5j Recommended 7.5j
225/40 x 16, 17 and 18 7.5j
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- 9j Recommended 8j
235/40 x 17 and 18 8j
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- 9.5j Recommended 8.5j
245/40 x 17 and 18 8j
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- 9.5j Recommended 8.5j
255/40 x 16, 17 and 18 8.5j
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- 10j Recommended 9j
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35 Profile
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215/35 x 16, 17 and 18 7j
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- 8.5j Recommended 7.5j
225/35 x 17 and 18 7.5j
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- 9j Recommended 8j
235/35 x 15 and 18 8j-9.5j Recommended 8.5j
245/35 x 15, 16, 17 and 18 8j
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- 9.5j Recommended 8.5j
255/35 x16 and 18
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8.5j
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- 10j Recommended 9j
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If there are any more people would like or any more about ETRTo then feel free to ask.
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HTH
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PS, please make this a sticky mods, I can then add to it as people ask questions!