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This has been an interesting read. But I was left unsure of whether anyone has used light wheels to actually achieve a measured effect (in an urban environment) as I am thinking of changing car's alloys to "steelies" which are traditionally lighter.
I couldn't figure out why unsprung mass became a discussion point in this thread. It has a massive effect on vehicle ride/handling, spring arb choices etc but has no direct impact on fuel economy. A possible side benefit though.
Furthermore has anyone gone mad and fitted 10" wheels to reduce the wheel inertia significantly (and changed gear ratios, brakes and speedo to compensate).
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