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I think rims are never in pure aluminium, so when it comes to rims it will either be an iron alloy or an aluminum alloy.
Or... you go mental and get some ultra lightweight magnesium racing rims...
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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