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Another JR

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  1. Another JR
    I'm about to order a 2021 3500HD SLT CC LB SRW, so I've been using the GMC build and price page quite a bit and looking at options. Regardless of the wheels you order, the provided spare is 275/70-18, same as the standard wheel. According to on line tire size calculators the diameter of a 275/70-18 is about 33.2 inches, and the diameter of the optional 275/65-20 is about 34.1 inches, for about a 2.8% difference.
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