I was thinking about getting light weight rims until I realized that with the MPG gain (which I don't think will be much) would never pay off what you paid for the rims. Once I had new tires and rims that weighed 36 pounds extra all together and I saw no real change in my MPG, they were 44psi and the others were 35psi so I think that small difference canceled out the weight gain problem. But if the rims are super cheap I would go for it.
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