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I changed out my stock sierra wheels 245/70/17 ( I think can't remember now :) ) to a factory size 20" Rim on 275/55/20 tires. There is no rubbing whatsoever but these tires are heavy. The total package weight was nearly 468 pounds. That's a whole lot more then the previous wheels and tires. The ride is just as smooth in my opinion and I went with an all terrain tire. Also performance suffers slightly but I lost nearly 2 MPG if you can believe it. I went from around 13.5-11.5. Yeah it sux. What's the main reason you want to go with the factory wheels. I picked up some aftermarket for $1498.00 Including waranty,shipping, mounting and balancing. :great:
 
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