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Run flat tire weight.
Having switched back and forth from my stock 161 wheels with the run flat Potenzas, and my Beyern five spokes with Michelin Alpins, I've noticed the stock wheels are much heavier. BMWfan.info shows the 161 rim weighing about 22 pounds. Could the run flat tires be contributing a significant amount of the unsprung weight?
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328i Sports Wagon in Monaco Blue, Sports package, everything but naviagtion. BMW performance intake, BMS powerbox, currently running Michelin Alpin snow tires on Beyern 5 spoke rims.
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