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I will try to make test to put 155/80R14 tire to 5.5" wide rim. Purpose is to get better aero. At least on my Lupo 3L 145/80R14 Bridgestone B381 ecopia vs Nokian hakkapeliitta R 175/70R14 the narrower tire is much better even the Hakkapeliitta R has better LRR factor (is lowest with Michelin XI2)
Wider tire gives much more drag than the RR can give benefit. I will also test 155/65/R14 Hakkapeliitta R later this winter so I know is the aero really the problem or something else. (rims have little bit different ET and are heavier etc...
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