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I know, I know some threads cover some of my questions....sorry!

My 05 CC has had 275 70 18 Continentals since I bought it. I need new tires and want wider tires for sure. I know the 275 70's are heavier than stock p-rated tires.

A guy at Discount said 285 65 18's will kill my power and obviously the 305 or 325's will be even worse. I had a cummins and it didn't mind tire size too much......are the Titans really this bad?

How much power will I realistically lose and more importantly, how much will mileage suffer with Dynapros or Nitto Terra Grapplers?

Thanks!
 

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I think the 285/65/18s are 32.6" they are the same size in diameter as the stock tires on titans which are 265/70/18, but they are a little wider; the 275s are 33.4", and the 305/65/18 are 33.7" and 325/60/18 are 33s; none of these tires should mess with anything my dad has the 275s and it feels the same to me when I drive his truck, u might notice a little extra weight on the 305s and 325s but they wont kill performance at all, just remember he works at Discount Tire and knows jack squat about whats gonna hurt performance on these trucks (I mean these guys thought my GT was messing with the TPMS sensor light, it wasnt)
 
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