I've been hunting tires to fit a Metro, and like the OEM tires from the early Honda Insight. The Citroen 2CV has some tall, skinny tires, too, and was engineered around them as the 1st radials.
As an ex-silversmith, I'd love to be beating out a nice copper bottom for a car, but for the weight, aluminum gives even more heat transfer, and you can solder it easily with zinc based rod.
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There is no excuse for a land vehicle to weigh more than its average payload.
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