Quote:
Originally Posted by CapriRacer
So focusing on that one chart - RRC by tire size - it says that small tires (and here I am using "large" and "small" to mean load carrying capacity) have worse RRC than larger tires.
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Plain & simple :
Car manufacturers that make "eco" versions of cars, use
thinner wheels than usual.
Example : VW electric up!
One some cars over here, you couldn't get different optional (read: wider) rims because that'd increase the CO2 output beyond the limit that made the car qualify for a government sponsored discount.
On dedicated eco-vehicles,
thin wheels are used - period.
Examples : VW 1L / BMW i3 / Renault Zoe
They've known it all along ...
Remember VW's Beetle had jolly big, narrow rims.
Wider tyres also scrub more when cornering - and you pay for it in fuel use.
If wider tyres would give a fuel consumption benefit, they'd be used on those dedicated eco-vehicles or more economical (or ecological) versions of "standard" vehicles.
But that just ain't happening.