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Old 04-24-2016, 06:43 PM   #1
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Towing with 20" tires

So I have owned my 2012 Ram 1500 sport since new and racked up about 10k towing with no issues. This has all been on the factory 20" rims and Goodyear Wrangler HP Tires.

Now I am looking at replacing my tires I've noticed that I don't think my tires were ever the correct tires for the truck. The truck is rated for 10,050lbs obviously that is without extras and me being 150lbs! which I ain't.

The load range on the tires is 123 which means 2650lb per tire. The problem I have is that if I want a higher load range (126, so 3750 a tire) I have to move up to an aspect ratio of 65 from 60. So from 275/60R20 to 275/65R20.

Would the stock tires that came with the truck not have to be rated to be able to handle what the truck is rated for? Or am I just discovering that they are under rated and should move up a tire size? I know it throws my speedo off by about 3 clicks.

When loaded my TT weighs about 5500lbs.
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Old 04-25-2016, 07:37 AM   #2
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Have you tried asking the guys at tirerack.com?
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Old 04-25-2016, 08:04 AM   #3
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What do you mean the truck is rated for 10,050lbs? You must be referring to its published tow rating because there's no way a Ram 1500 has a GVWR that high.

GVWR is the maximum weight that your truck alone can weigh, and that is one of the numbers you need to consider when selecting tires. I'm willing to bet your truck's GVWR is around 7,000lbs give or take. If that's the case then a tire rated to 2650lbs like you said is more than enough. You must also consider the rear axle weight rating. If your rear axle is rated to 4000lbs then obviously each tire must be 2000lbs rated minimum, for example. All of these weight restrictions are published on a sticker inside your driver's door jamb.

It is always a good idea to over-tire your vehicle. I run Load Range E tires on my truck that are rated for somewhere around 3500lbs each even though my truck maxes out at 7700lbs GVWR. You'll have a much more stable tow, cooler tire temps, and a better resistance to flats. If you shop around and look at different brands you should be able to find your exact tire size in a higher load rating. Heck, even Load Range C or D would be fine with what you're pulling. I always like going up a size or two in tire when I replace and I've noticed barely any speedometer discrepancy.
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