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Old 10-21-2014, 06:30 PM   #1
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Best tire size for towing

Tried using the search function for my question, but it returned a wide variety of topics. So I'll just go ahead and ask.
Needing to buy new tires for my new to me 2500 Yukon xl which currently has 265/75/16 LT Michelins on the stock rims. I like the looks of the 265s but it came with 245/75/16s. I was informed by a tech at a tire shop that while the 245s were on it stock, towing wouldn't be as stable as the 265s. Now I'd like to go back to the 245 series if I could, but I made the decision to get the 2500 Yukon for stability purposes and I don't want to lose anything that I've gained by going back to stock. Also, there was a good deal on some 235/85/16s. I saw in a post that SmokeyWren was running those. Any thoughts on that size?
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Old 10-21-2014, 07:52 PM   #2
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The truck will work fine with any of those 3 tire sizes. The only thing that will change is the gear ratio. The taller tire will take a little bit of your low end power. The 235/85/16 is the tallest. You may gain some weight capacity with the 265's and 235's Im not sure how much. It will also throw off your speedo. I have 285's (same height as 235's) on my 2500 and when the speedo reads 60 Im actually going 63mph. not a big deal.

If you have the 4.10 gear ratio I would say put what ever ones you like the best. If you the 3.73 I would stick with the stock 245's to keep the low end power.
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Old 10-21-2014, 08:19 PM   #3
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I have the 3.73s. Thanks for the info!
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Old 10-22-2014, 09:37 AM   #4
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Have always found that increasing tire size hurts towing. Also burned more fuel.
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Old 10-22-2014, 12:20 PM   #5
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Quote:
Originally Posted by dcarver View Post
Needing to buy new tires for my new to me 2500 Yukon xl which currently has 265/75/16 LT Michelins on the stock rims. I like the looks of the 265s but it came with 245/75/16s. Also, there was a good deal on some 235/85/16s. I saw in a post that SmokeyWren was running those. Any thoughts on that size?

I have the 3.73s
LT245/75R16E weight capacity 3042, revs/mile 683

LT235/85R16E weight capacity 3042, revs/mile 657

LT265/75R16E weight capacity 3415, revs/mile 655


The percentage difference in revs/mile will be the percentage difference in effective axle ratio, speedo, odo, and trip meter accuracy. The standard 245s are slightly shorter than the other two, so your speedo should be accurate when running that size. The 235s and 265s are 4.3% taller than the 245, so your 3.73 axle will "feel like" a 3.73 minus 4.3% = 3.57.

The 245s should result in slightly more power/torque for dragging a trailer up a grade. But if you are happy with the towing ability with your 265 tires, then you'll be happy with either the 265s or 235s.

With 265s or 235s, your speedo will be slower by 4.3%. That's 3 MPH at 70 MPH, so an indicated 70 MPH would be 73 MPH on Officer Bob's radar. That's assuming your speedo was accurate with the stock-size tires. But most factory speedos are slightly fast, so the taller tires may correct the speedo instead. Any decent GPS or navigation system will tell you the actual MPH you are making, so it's easy to determine speedo accuracy.

My favorite 16" truck tire is Michelin XPS. Expensive but worth it. But they are limited in sizes available. With traction tread, only the 235s are available in your three sizes. With rib tread, 235s and 245s are available, but not 265s. For my use if I wanted 245s, I would put Ribs on both axles. I put around 100,000 miles on mine with ribs on both axles. But if I wanted tractions on the rear or both axles, then I would run the 235s.

http://www.tirerack.com/tires/tires....l=XPS+Traction

http://www.tirerack.com/tires/tires....eModel=XPS+Rib

LT265/75R16E is not available in the all-steel XPS design. So if you want to stick with that size, then I would go to Michelin LTX M/S2. Less expensive than the XPS, but still an excellent tire.

http://www.tirerack.com/tires/tires....del=LTX+M%2FS2

Quote:
I was informed by a tech at a tire shop that while the 245s were on it stock, towing wouldn't be as stable as the 265s. Now I'd like to go back to the 245 series if I could, but I made the decision to get the 2500 Yukon for stability purposes and I don't want to lose anything that I've gained by going back to stock.
That tech didn't know what he was talking about. There is no difference in stability in those three tire sizes provided the tires are inflated to the PSI required by the TRA load/inflation table. The only difference in "feel" when towing will be the slight difference in effective rear axle ratio caused by the difference in revs/mile (i.e., diameter) of the tires. The 235s and 265s will feel identical. The slightly shorter 245 will have slightly more power and torque for climbing hills and mountain passes, but won't be noticeable most of the time.
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Old 10-22-2014, 05:47 PM   #6
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Thanks for the response. That's was very informative and exactly what I needed to know!
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Old 10-23-2014, 07:56 AM   #7
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The only legal tire size for your vehicle is identified on the sticker inside your door jamb.
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Old 10-28-2014, 09:38 AM   #8
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The only legal tire size for your vehicle is identified on the sticker inside your door jamb.
Legal??
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Old 10-28-2014, 09:42 AM   #9
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265 for load and bigger footprint. Aspect ratio 70 for correct gearing and stability. Wheel size 16 is unchanged.
The 265 75s are the wrong size if it came with 245 75.
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Old 10-28-2014, 11:14 AM   #10
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265 for load and bigger footprint. Aspect ratio 70 for correct gearing and stability. Wheel size 16 is unchanged.
The 265 75s are the wrong size if it came with 245 75.
Yes, but the 265/70R16 is also the wrong size when you compare revs/mile. Plus almost all tires available in size 265/70R16 are P-Series tires that don't have enough weight capacity to replace the LT245/75R16E stock-size tires. There is one LT265/70R16 tire available on Tirerack.com in a common brand, the BFGoodrich AllTerrain, but it is a load range D tire, not E.
LT265/70R16 117/114S D
Max weight capacity 2835 lbs.
Max PSI 65 psi
Tire revs/mile 675 compared the stock-size revs/mile of 655. IOW, the BFG 265/70R16D is shorter than the stock size 245/75R16E by about 3%.

TireRack doesn't carry all brands, so I also checked Toyo and Cooper tires. Nope, they don't make an LT tire in that size either.
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Old 10-28-2014, 04:05 PM   #11
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Ok, Michelin LTX 255/70-16 then. That's actually a better size anyway as far as specs to stock. Available in E.
They are only a half inch shorter overall. You won't see much difference, but it will feel better.
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Old 10-31-2014, 06:08 PM   #12
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I used to like bigger tires on truck but as I get older ad more into RVING instead of towing race cars and boats I ted to stick with stock tire sizes. It creates new issues when you raise a truck up with bigger tires and if you don't stick with load range E tires you are not gaining anything.
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Old 11-08-2014, 04:34 PM   #13
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I was talking to the manager at Costco about the Duravis R250's I was buying. He said they sell a few sets a year to put on one ton dualies with utility beds and cranes.

He said that he sells far more Duravis R500's for personal use street trucks. He's seen some with 100K miles before being worn out.

It's hard to believe that such a heavy, gutsy tire with two steel belts bead to bead is in the same weight class as the other E rated tires like my Toyo Open Country A/T's on my SuperDuty. Duravis' are a seriously heavy duty tire.
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