Tire Size Difference between wheel diameters
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5th Wheeling
Joined: Mar 2007
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Tire Size Difference between wheel diameters
Im in the process of ordering a Lariat and trying to figure out if I want the 18" or 20" Bright Machined wheels and noticed the tire sizes on them. The 18" wheels have two inch shorter tires on them, then the 20" wheels. This seems somewhat idiotic on Ford's part by running little pizza cutters on the 18" wheels.
Cargo Master
Joined: Jan 2015
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From: Boise
You can get the 275/70/18 which are roughly 33.2. Then you can get 275/65/20 which are roughly 34.1 tall. Today, there are more tire size options in the 18 and they generally cost less vs. the 20". Go with what you like the look of best.
Elder User
Joined: Aug 2016
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Actually the 20's are 33" and the 18's are 33.2" so the 18's are taller. For ride comfort the 18's have a 7.6" side wall and the 20's have a 6.5" side wall. The circumference of the 18's is 104.1 and the 20's are 103.6, so the 18's are a bigger tire but "look" small because of the look of the 20" rim.
Here is a site for you to check out: https://tiresize.com/calculator/
That all said, for me, I went with the 18's IMHO they were right for me, as I was looking for a slight edge on ride comfort with a taller size wall.
And last when you are in your truck driving down the road, you would not know the difference between 18's or 20's.
Lets us know what you go with.
Here is a site for you to check out: https://tiresize.com/calculator/
That all said, for me, I went with the 18's IMHO they were right for me, as I was looking for a slight edge on ride comfort with a taller size wall.
And last when you are in your truck driving down the road, you would not know the difference between 18's or 20's.
Lets us know what you go with.
< Samantha...my Co-Pilot
Joined: Dec 2001
Posts: 768
Likes: 11
From: Fallon, Nevada
Actually the 20's are 33" and the 18's are 33.2" so the 18's are taller. For ride comfort the 18's have a 7.6" side wall and the 20's have a 6.5" side wall. The circumference of the 18's is 104.1 and the 20's are 103.6, so the 18's are a bigger tire but "look" small because of the look of the 20" rim.
Here is a site for you to check out: https://tiresize.com/calculator/
Here is a site for you to check out: https://tiresize.com/calculator/
Elder User
Joined: Aug 2016
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I stand corrected I put in 275 60 not 275 65 which is 34.1 inches tall.
That said, I believe it comes down to the individual like of the "look" of the tire. Ride wise I believe it would be hard to tell the difference between the two size tires.
That said, I believe it comes down to the individual like of the "look" of the tire. Ride wise I believe it would be hard to tell the difference between the two size tires.
Logistics Pro
Joined: Jan 2013
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your best bet on tire true sizes is to go direct to the mfg for the tire(s) you want to run, I assure you they are different from mfg to mfg.
example: https://www.goodyear.com/en-US/tires...ViewSizesSpecs
example: https://www.goodyear.com/en-US/tires...ViewSizesSpecs
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5th Wheeling
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According to the website the 18" wheel size is a 275/65 not a 275/70. If it is a 275/70 that makes more sense.
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Senior User
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275/65 is the standard AS 18 inch tire. 275/70 is the AT option or the high capacity option, depending on how you look at it.
Last edited by gbkeith; Sep 5, 2016 at 12:03 AM. Reason: mistyped 60 instead of 65
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Elder User
Joined: Aug 2016
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On my order for the F250 Lariat mine are listed as 275/70/18's
Cargo Master
Joined: Jan 2015
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From: Boise
I have never seen a 275/60 from factory, only 275/65, but more often the 275/70.
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