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Old 02-23-2014, 09:14 PM   #1
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New Tires for TV

So, a few weeks ago I purchased new tires for my 2011 1500 Suburban. Michelin P275/55/20 LTX MS/2 The Discount tire folks recommended that I run them around town with 35lbs of air. I immediately realized an extra 2 to 3 mpg and a very smooth ride!. They also recommended that I increase the pressure to 42 lbs while towing. I tested it this week with a trip to the Texas Hill country. I was not happy with stiffness of the ride and my miles per gallon actually dropped to 9.5 from 10.5. The information on the sidewall indicates that each tire will carry 2300 lbs at 44 lbs of pressure. I understand that I should increase the pressure while towing. But to what? Is 44 recommended regardless of the weight? Is it necessary for me to give up the wonderful ride I get at 35lbs? Your opinions are greatly appreciated.
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Old 02-23-2014, 09:45 PM   #2
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My current tow vehicle (2008 Jeep Grand Cherokee) has 17" wheels with P245/65R17 tires.

New Grand Cherokee Overland's come with 20" wheels with P265/50R20 tires. I am concerned that the lowere profile tires on the larger rims will not be acceptable tires for towing.

Does anyone have information on the importance of sidewall height for towing.
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Old 02-23-2014, 10:43 PM   #3
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No strong technical info here, just an opinion, but I probably would not want to tow with tires that have a profile below .65. I definitely would not want 20" wheels with a .5 profile tire.

Dan
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Old 02-23-2014, 11:18 PM   #4
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Quote:
Originally Posted by Grand Master View Post
My current tow vehicle (2008 Jeep Grand Cherokee) has 17" wheels with P245/65R17 tires.

New Grand Cherokee Overland's come with 20" wheels with P265/50R20 tires. I am concerned that the lowere profile tires on the larger rims will not be acceptable tires for towing.

Does anyone have information on the importance of sidewall height for towing.
I had similar concerns when I bought an F150 with 20" wheels and P275/55/20 Pirellis. However they worked fine and got 44K miles out of them, 25K of that towing. No sway or poor handling. Just changed to an XL tire that has a higher load capacity. A taller sidewall will give a softer ride but the low profile seems to be more stable. Door sticker says 35lbs but I run at 41 when towing.
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Old 02-26-2014, 09:20 PM   #5
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I tow with the max psi listed on the tire regardless of brand. On my F-250 that means 75 lbs on my E rated tires. I expect yours are either C or D rated which run a considerable less psi, but if I were you, I'd still run the max psi when towing whatever that is.
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Old 02-26-2014, 11:10 PM   #6
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We have the factory 20" wheels/low profile tires on our 2012 Ram 1500 truck and they are very stable, handle nicely with or without the trailer. As good as can be expected for a solid rear axle truck.

We use 35 psi normal use as indicated on the door sticker. The tire max is 44 psi which is what we use when towing using a good weight distribution hitch (ProPride 1400).
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