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If you went from 15" wheels to 16" wheels some of your added weight from that.
________________________________________________________________________________ I know that a 16" tire and rim will weigh more than a 15" tire and rim. My point is that the 5 Michelin's all weigh the same while the 4 Carlisle have a 2.5 pound difference in weight. And what's really eye opening (to me) is that the one PowerKing that was left of the original 5 only weighed 52Lbs! The Carlisle and PowerKing were the same size and load rating... I would think they would be closer in weight.