Quote:
Originally Posted by CapriRacer
I'm afraid you are mistaken in this. I think the source of the misunderstanding is that you are trying to look at too big a picture.
If you imagine a tire with a given load on it - and you can change the tire, but you can't change the load carrying capacity - then narrow treaded tires work better - less volume of rubber moving = less hysteresis.
BTW, the graph posted earlier is RRC (Rolling Resistance Coefficient) and not RR (Rolling Resistance) - and that might be part of the confusion.
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That aint quite so.
RR = RRC * load
You've got a car applying a load X.
You have P215/70R15 with a RRC of roughly 0.0099.
You have P195/65R15 with a RRC of roughly 0.0113.
Both tires can handle load X.
Which tire has the lowest RR?
EDIT:
Quote:
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And since we know that rated load plays a HUGE role in RR
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Where exactly do you see rated load in the RR equation? It's the actual load, we usually never reach the rated loads.