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Posted

I have a 2021 gmc 2500 and it has the stock 17 inch wheels on it. My question is I’m going to stock 20 inch gm wheels 275-65-20. Do I need to take it in to dealership for anything? TPMS, Speedo calibration?

Posted

Yes.  ECM and the BCM will need to be flashed as you are going from a 31 inch tire to a 34 inch tire.  Dealer has to call in to GM TCSC and get a VCI calibration.  You are probably looking between $150-$250 for the dealer to do it.  

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