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Old 03-19-2015, 01:53 PM   #51
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I don't think it is ground breaking to suggest that the weight rating of traditional truck tires with a normal sidewall is higher than a low pro tire with a smaller sidewall. Maybe I'm wrong, but that is all I was getting at. When I see 18 wheelers with low pro tires I might change my mind. More sidewall = higher weight rating. But I don't claim to be all knowing, just seems logical to me
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Old 03-19-2015, 01:56 PM   #52
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Dealer called this morning before 8 to let me know my VIN has been created and to expect mid April. Can't wait even after being a die hard diesel owner for the last 15 years.



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Old 03-19-2015, 02:19 PM   #53
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Originally Posted by Semperfi24 View Post
I don't think it is ground breaking to suggest that the weight rating of traditional truck tires with a normal sidewall is higher than a low pro tire with a smaller sidewall. Maybe I'm wrong, but that is all I was getting at. When I see 18 wheelers with low pro tires I might change my mind. More sidewall = higher weight rating. But I don't claim to be all knowing, just seems logical to me
Here are the load ratings for typical 18" and 20" tires. Keep in mind that P rated passenger tires have a 10% lower capacity than stated when used on trucks.

275/65-18

Load Range 113= 2282 (2535 x.9) Total= 9128 (4 tires @ 2282 each)
114 (stock Goodyear rating) 2341 (2601 x .9) Total = 9364
116 (some SL and XL) 2480 (2756 x .9) Total = 9920

275/55-20

Load Range 111 (SL rating, standard from factory) = 2163 (2403 x .9) Total= 8652
117 (XL load range) = 2550 (2833 x .9) Total = 10,200
115 (LT LRD tire, so no 10% reduction- what I run) = 2679 Total = 10716

Basically what I'm seeing is that stock tires in either 18" or 20" have a higher load rating than the trucks GVWR by a substantial margin, so I see no reason to believe they would need to downgrade the rating on a 20" wheel option truck. I also found it interesting that the SL load range has a higher rating on the 18" (113-116 versus 111) than the 20", but in the XL rating, the 20" has a higher carrying capacity (117 versus 116). Of course, you can step up to a load range E in either and have substantially more carrying capacity than the stock load range. I wanted to stay with stock size and went with LRD tires as LRE aren't available in 275/55-20, but have 10,716 total carrying capacity even with those.
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Old 03-19-2015, 02:38 PM   #54
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I went with 285/55-20 for E rated. I also wanted some traction for snow. They are larger by amount a 1 inch. I was told the rims are capable by both dealer and tire dealer. He ran the same on his F 150. Next truck will be 18 inch wheels as I will want summer tow tires and winter snow tires. I can get a set of stock take offs tire and wheel for $1,000.
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Old 03-19-2015, 02:40 PM   #55
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Wish I could remember where I had gotten that info about 18 versus 20 with regard to payload. If I remember correctly it was approx 400lbs difference. But it may have been an apples to oranges comparison of it was using different load range for the 18 than for the 20. Interesting numbers regardless.
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Old 03-19-2015, 03:05 PM   #56
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Wish I could remember where I had gotten that info about 18 versus 20 with regard to payload. If I remember correctly it was approx 400lbs difference. But it may have been an apples to oranges comparison of it was using different load range for the 18 than for the 20. Interesting numbers regardless.
That is close to the difference you will see on a MaxTow versus non MaxTow. Maybe that is where the difference was and not because of the wheel/tire size???
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Old 03-19-2015, 03:06 PM   #57
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I went with 285/55-20 for E rated. I also wanted some traction for snow. They are larger by amount a 1 inch. I was told the rims are capable by both dealer and tire dealer. He ran the same on his F 150. Next truck will be 18 inch wheels as I will want summer tow tires and winter snow tires. I can get a set of stock take offs tire and wheel for $1,000.
My plan exactly. I paid $1K for the 20's when I could have gotten a set of take offs with brand new tires on them for ~$1400 and had an extra set of wheels and tires to boot.
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