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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
275/60....10.8" wide and is 33"tall
305/50.....12" wide and is 32" tall just as Hammer already said. Your sidewalls will be a little bit smaller and your tires will be wider(fatter) looking at them head on. This is a smaller tire with benefits of width.
275/60 is stock size tire. It's a bit on the narrow side, but it's got the height of still leveling and not needing to go bigger.
I put 305/55/20 BFG All Terrains on my stock rims before my leveling kit and didn't have any issues. No rubbing at all. The tread measures 10.8" wide and the tire is 32.5 to 32.75" tall. It is 4wd though, I don't know if the 2wd trucks sit lower in the front. I also had 305/55/20 BFG KM2's on 9.5 wide rims on there with no rubbing, but it was leveled at that point. I am selling the KM2's if you are interested, they only have between 5000 and 6000 miles on them.
I am looking for similar information. I have an '06 Megacab and want to put bigger tires on it. I am looking at the Goodyear MT/R with Kevlar but not sure what the biggest size is that I can go without a lift. I was thinking of 315/70/17 but not sure if they will fit or not.
315's are big. I believe they are between 34 & 35" tall. My buddy has an 05 1 ton ram and had a 315/70/17 bfg all terrain test fitted and they were way too big. He has stock suspension. Not sure if Goodyear makes one, but bfg makes a 305/65/17 and those fit on his truck with no rubbing. Also, I fit 305/55/20 bfg all terrains on my 07 1/2 ton 4wd without a lift and had no problems.