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The REAL issue on trucks and larger tires was pointed out by Frank Lee at the very begining:
Final drive ratio.
(shame op didnt even understand that he had gotten his answer on the first reply)
To determine if this mod is correct for a specific truck, the owner needs to walk thru the following:
What was the stock size (maybe the last owner already upsized and you will go too far!)
What is the Current rear ratio
Current rpm at 50, 60, 70
What do you REALLY use the truck for (if you really do tow or haul, the lose of the smaller /original size might hurt performance)
How much time on the road at 'cruzin speed'(as opposed to intown/city)
Compound difference in tire rubber (as Racer discusses so well)
visuall appeal.
"Typically"......if you upsize from the stock size and stay w/ a 'road' tire. ANd rpms are above around 2-2500 (w stock), then upsizing might make sense.
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