Check to see how much clearance you will have when turning the steering from stop to stop. If you have plenty of clearance then they should work.
Now that being said beware that your speedometer will will read that you are going slower than you actually will be. You can use a GPS to verify what your speed is and make a chart to show you what to set the speedometer to for the desired speed you want.
Or you could just enter the original tire size and the new tire size into the boxes on this page and see what the difference would be. You can change the "If your speedometer reads:" drop down box to see the difference at various speeds. http://www.discounttiredirect.com/di...foTireMath.jsp
Going from 245 to 265 only changes how wide the tread profile is and not the OD of the tire. So, the speed calculation isn't really needed. BUT, it's a good link to us for other things.
My B2500 OEM tire rating is 225/75R16 Load D. I've put on 235/75R16 Load D in 2007. The tire has a slightly wider tread width. They fit without hitting anything when turning the wheel from stop-to-stop.
Changing from a 245 to a 265 will definitely change the overall diameter. if the aspect ratio of the tire remains the same (75) then 75% of 265 is greater than 75% of 245 which results in a greater diameter. The tires mounted on rims standing side by side was about 1.5".
In any case, I tried the 265's on the front and they wouldn't fit without chopping away a section of the bumper and the body at the back of the wheel well. Even with the 1.5" lift I added to the front a pothole or speed bump at full lock would have resulted in rubbing on the body. I stuck with the 245's and am running a rim with more positive offset. I also installed 1/4" spacers between the hub and rims. The front end sits nice now. A lot more balanced than the rear end jacked up look that I had happening.
changing tire size from 245 to 265
