Upgrading to 18" truck tires

I did it, 265/70-17 to 275/70-18 and I could not be happier. I found a set of 18" alloy Big Horn wheels from a 2014 on Craigs list for a good price. I went ahead and had the wheel size reprogrammed as the speedometer difference irritated me and I hear the shift points would be affected. I picked up almost 1000 lbs of capacity over the stock wheels and the extra safety margin makes me feel better when I run heavy.

I did it, 265/70-17 to 275/70-18 and I could not be happier. I found a set of 18" alloy Big Horn wheels from a 2014 on Craigs list for a good price. I went ahead and had the wheel size reprogrammed as the speedometer difference irritated me and I hear the shift points would be affected. I picked up almost 1000 lbs of capacity over the stock wheels and the extra safety margin makes me feel better when I run heavy.

Actually, "truck" tires are 19.5", not 18". Rickson tires will sell you the wheels, and a variety of 19.5 truck tires, as well as programing your computer to compansate for the larger tires. They claim 8 plus years on a set of tires!

Price? That would be a deal breaker for me. I doubt other than bling you will gain anything worth while.

There are lots of 18" tire options out there these days. Should be no issue with the diesel going larger diameter tire. Your speedo will now be off by a couple MPH at hwy speed. Best to check it with a GPS.

I went from 17" to 18", but my originals were 265/70-17 and I went to 275/70-18, and it was on a Ford. Brand doesn't matter, but point is you are starting out smaller than mine. (just saw your edit on size - so you would be making the same size jump as I did)

On the positive side, you get a higher load rating, a tire that fills the wheel house better (looks) and more ground clearance.

On the negative side, you might have bed height issues under your fiver. Wheels - I found take-off OEM 18" wheels, which are hub centric. If you go with aftermarket wheels, I don't think there are any that are hub centric. They are all lug centric. Even though they are rated for the weight, I would hate running lug centric wheels under heavy loads. Fuel mileage - it will probably suffer a little bit. Power - it will suffer a little bit, but the CTD has plenty to spare. Tires will cost more. Not as good a selection in 18".

The pro list is shorter than the con list, but I'm happy that I did it. The added load capacity alone is worth it to me.

Correction to my original post.....the current tires are 265/70/17.