Mainly just for looks and better tires overall. The stock 245's just look way to small on the truck. Most have 285's some have 265's. THen you have the guys with the H2 rims and/or tires. Those require a little bit of work to fit if you keep the stock h2 tires.
I haul a 3700# loaded camper and the stock 245's with 80psi looked like they were going flat. I went to 265's rated at 3415# load each, which handle the camper much better. Sometimes even they look a little stressed. I would like to go with 305's with a load rating of 3525# each, but I don't want to cut up the fender wells.
As for the 265's they look much better than the 245's, but they still don't fill the fender wells. My speedometer seems to be right on with the 265's, according to the roadside radar trailers. I really did not notice a power loss with them. I get 16.5 Hwy and 11 hauling/towing. When the truck was new it got 17 Hwy with the 245's.
If I wasn't hauling and towing big loads at times, I would just go for 285's. They look the best with the truck leveled.Edited by: GMCsteve
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