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Discussion Starter #1
I recently bought new tires and they are a lot smaller then the ones my truck was tuned for i had 37/13.5/r20 now i have 305/55/r20 and i was wondering if i can just plug in my tuner and change the revs per mile and be good to go or if i need a whole new tune
 

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Just change the rev per mile.
 
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