Actually some aluminum rims are heavier than steel rims. Aluminum is a bit more than 1/3 the density of steel (.1 lb/in^3 vs .28 lb/in^3) So if an aluminum wheel is 3 times as thick as a steel wheel it will be heavier. Most of the cast aluminum wheels are pretty thick, and heavy. Steel wheels vary in thickness quite a bit too. I run steel wheels.
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