Quote:
Originally Posted by Blue Bomber Man
Capri:
On the research that I have read the best range for low RR tires is around 15-16 inches in general. However the best documented tire I could find was the B381 Bridgestone, which was a 14 inch tire
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On a practical basis, most low RR will appear in the smaller tire sizes. That's because vehicle manufacturers are targeting the "fuel economy" segment with small cars and they specify tires with lower RR. Obviously larger cars are heavier and less fuel economy comes along for the ride - and this has a major affect on overall fuel economy - much more than tires as a vehicle component has an effect.
However, if you look at the sizing aspect by itself, larger load carrying capacity has a minor effect compared to the tread compound itself, but larger tires are directionally better.