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Old 01-11-2014, 01:12 PM   #1
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Tow Vehicle Tires

Its time to change out the tires on our 2010 Ram 1500. It came with 20" wheels and P275/60R20 Goodyears.

When pulling the trailer with the current tires the back of the truck seemed to feel squirmy at times, so I would like to go with a heavier sidewall. Unfortunately there is a very limited selection of tires with a heavier sidewall for 20" rims in these parts.

As others have mentioned there is the option to going with to a 17" rim. but I didn't really want to go that route.

Looks like I'm going to go with the Nitto Dura Grappler Highway Terrain tire.
Its E load range which is probably a bit of overkill, but was the only tire available here that had a heavier sidewall and was the same size as the tires that came on the truck.

Comments I've read online from people that use them for towing, they seem to be a pretty good tire. The one major thing I read was to make sure to drop the tire pressure when the the truck isn't loaded to prevent premature wear.
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Old 01-11-2014, 01:20 PM   #2
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Better control with 17" tires.

Drop pressure to what? Below the recommended pressure on the door label?
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Old 01-11-2014, 01:31 PM   #3
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Quote:
Originally Posted by Chuckinca View Post
Better control with 17" tires.

Drop pressure to what? Below the recommended pressure on the door label?
I haven't got the tires yet and will have to check what the manufacture recommends, but the comments I read that they were using 80 psi when hauling and 50 psi without a load.
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Old 01-11-2014, 02:02 PM   #4
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My F-350 has 20 in wheels and load range E. You are correct about lowering the pressure when not towing. My brother manages a Firestone and suggests I run 55 psi when not towing. I just picked up my new 5er yesterday and it tows great with the 20s and it has a 1800lb hitch weight.
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Old 01-11-2014, 05:31 PM   #5
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IMO, you should never run 80 PSI in a half ton truck even your tires are rated for that PSI; are you rims rated for 80 PSI? Maybe not. And you don't need 80 PSI.

I've got Load Range C on my 1/2 ton. I run 40 without load and 50 with load. Works fine.

If you run 55 psi empty on load range E, be prepared for a significant reduction in ride quality. BTW, my buddy's F150 with P-metrics rides noticeably smoother than my F150 with LT's. They are virtually identical trucks in every other respect.

On the plus side, you will get a more controlled feeling while towing with LT's. We have noticed a big reduction in vertical bounce from choppy roads.

So, more comfort and control while towing, less comfort when empty. Those are pretty much the trade-offs IMO.
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Old 01-11-2014, 05:59 PM   #6
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Yes 80 psi does sound like a lot. Again I don't have the tires yet, so will have a better indication on recommended pressures when I can speak to the dealer some more.

Just been going by what others have said about these tires when reading the reviews on them.

I currently have P-metrics on the truck now and run them at 38 to 40 psi when I'm hauling the trailer. Just feel squirmy with the trailer and have read other Ram owners having the same complaint with the same tire.

Did some checking and if the information is correct, the tire bead or valve stem will fail at higher pressures before the wheel itself.

The tire dealer included a TPMS service pack, so I'll have to make sure that is a replacement stem for higher pressures. Also from what I read the 80 psi would be required to handle maximum load of the tire, which it don't think I'll ever get to with a 1500.
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Old 01-18-2014, 01:10 AM   #7
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Quote:
Originally Posted by Phil_J View Post
Its time to change out the tires on our 2010 Ram 1500. It came with 20" wheels and P275/60R20 Goodyears.

When pulling the trailer with the current tires the back of the truck seemed to feel squirmy at times, so I would like to go with a heavier sidewall. Unfortunately there is a very limited selection of tires with a heavier sidewall for 20" rims in these parts.

As others have mentioned there is the option to going with to a 17" rim. but I didn't really want to go that route.

Looks like I'm going to go with the Nitto Dura Grappler Highway Terrain tire.
Its E load range which is probably a bit of overkill, but was the only tire available here that had a heavier sidewall and was the same size as the tires that came on the truck.

Comments I've read online from people that use them for towing, they seem to be a pretty good tire. The one major thing I read was to make sure to drop the tire pressure when the the truck isn't loaded to prevent premature wear.
Phil, FWIW...

We replaced the original equipment 20-inch GY rubber with GY Wrangler Silent Armors. Ya, they're a p-metric tire but the sidewalls are considerably stiffer than the OE rubber, they weigh considerable less than a comparably sized E-rated tire and are a whole lot less pricey than that E-rated equivalent. They've been on the Dodge for two years now - really pleased with the way they've performed. Especially while towing.

Cheers
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Old 01-18-2014, 01:18 AM   #8
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Please pardon the dumb question , but what is a p-metric tire?
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Old 01-18-2014, 01:29 AM   #9
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Tow Vehicle Tires

A tire with a P in front of the numbers.
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Old 01-18-2014, 01:36 AM   #10
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Thanks, I should have gone here www.tirerack.com/tires/tiretech/techpage.jsp?techid=70, before posting.
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