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:Another thing is that the rims aren't 100% aluminum, and we all know how the melting point decreases as foreign metals are introduced to an alloy...:George It depends what they alloy it with. Most of the time when something is alloyed, they do it to make the material tougher, and many times that means alloying it with a stronger metal which has a higher melting point. Many times aluminum is alloyed with a bit of titanium. In either case, the percentages are very small and the melting point won't change much.
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