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2004 1500 silverado 20" tire size?

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Hello. Been running 18" rims with 265/70r18 tires during the summer. Sick of my old 17" winter tires and want to buy new summer rims. Was considering buying 20" rims and using a 275/65r20 tire. Not sure how to check tire size totality and figured I would get the best answers here. Will these fit or should I just stick with my 18" rims? Thanks. 

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