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Originally Posted by renault_megane_dci
Stick with the 195 65 R15 wheels where I intend to have the least RR tire available (namely Bridgestone Ecopia EP001s) on the rear only (the front have some thread left)
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Those are A A rated, aren't they ?
Nokian seem to have pulled the plug on their eLine A rated tyre ... they're no longer on their website ?
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Retrofit the 205 50 R17 wheels I had previously but with 205 55 R17 for a significant (?) 4.8% increase in perimeter.
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I wouldn't go wider if you're after top FE, nor would I get bigger wheels - unless you're willing to invest serious money in very light rims.
Eco tyre availability in 205/55/17 is even worse than in 205/50/17 (which are very expensive).
You'd end up with a heavier wheel+tyre combination, and couldn't get the best rolling tyres for it.
You'd be losing FE @ both ends.
I'd stick with the 15" and get the best rated tyres for them.
If possible with a higher LI than what you actually need so the sidewalls are stiffer.