285/70/r17 recalibration?

[Taco4g]

I am looking at getting a new set of tires/wheels. I'm seeing that the most popular fitting here are 285/70/r17's, I'm looking to pair them up with some Method 305's. My question is, how does the speedometer read after putting on these bigger tires and are you guys getting them recalibrated? I'm thinking of getting Mickey Thompson Baja Boss LT 285/70/r17 (Load E).

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[WKTJR1]

This is something I've been wondering myself. If at all possible you would probably have to take it to the dealer.