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Old 12-19-2014, 07:36 AM   #15
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We have as standard equipment on our F350 6.7 Diesel a set of five 20" Michelins. So far no issue and I don't notice a difference from the 18" we ran on the F250 6.7 Diesel we had. The 20" are E rated as were the 18". In fact I have a set of four 18" Ford Stock chrome wheels 18" Michelins E rated from our old truck I might use or sell. Only have 4,000 miles on the tires before I replaced them with new wheels and tires, then sold the truck.
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Old 12-19-2014, 08:08 AM   #16
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20" wheels in and of themselves are not bad at all, but the OP is talking about getting them as an option on a new GM 2500, and the ONLY TIRE MADE in the only size that will fit on the GM truck is the Goodyear Wrangler SRA (in my first post I had a brain fart and said BF Goodrich which was wrong).

Anyway, the Wrangler SRA does not have a good record in the size that fits the GM 2500 truck. They separate and fail. Have a friend that replaced his wheels in order to get Michelin 18's because the Goodyear Wranglers kept failing, and there is no other tire manufacturer that makes that size tire in a E load range. I believe they are 265/60X20E. And a larger 20" tire will not clear on the GM truck.

20's on the 1/2 tons work great, but they're not the Wrangler SRA's.
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Old 12-19-2014, 08:15 AM   #17
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As you all know, I have driven quite a few hd2500s TVs. I have had both 18s and 20s on my demos. I note no noticeable difference in tow quality (ie. sidewall "waddle" etc.), but as Steve says, there are many more options with the 18"ers.
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Old 12-19-2014, 11:25 AM   #18
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Get the 18's. There are no 8 or 10 ply 20" tires on the market that I am aware of.
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Old 12-19-2014, 12:25 PM   #19
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Quote:
Originally Posted by m.hony View Post
Get the 18's. There are no 8 or 10 ply 20" tires on the market that I am aware of.
There are several 20" E rated tires built, but the only size that will fit the original poster's considered GM 2500 is the Goodyear Wrangler SRA. No other tire manufacturer builds it, and that IMHO is the problem.

Dodge Ram uses a larger Firestone tire that I have not heard anything bad about, but it may be too soon, but that tire will not fit the GM 2500 as it's too tall.
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Old 12-19-2014, 12:34 PM   #20
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Stick with the 18's and put the extra money in your wallet. Good valid points made in the previous posts.
I have 18's on my 08 2500HD. Taller rims means smaller sidewalls, stiffer sidewalls, harder ride, and usually less tire life.
Larger rims looking better is a matter of personel preferance.
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Old 12-19-2014, 12:39 PM   #21
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Nitto Terra Grappler AT tires come in 20" D(XL) 8 ply and E 10 ply. I currently use them on both (XL) my F150 and Touareg (18's) for towing and they handle well. A 20" tire has a lower profile and generally has better handling due to the "firmer" sidewalls. The 18" tire/wheel in the same diameter will have a taller profile with more sidewall for a softer ride and better for off road use. But the difference is not that great so it all depends on what your intended use is and what pressure you set the tires at. Both will work for towing.
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Old 12-19-2014, 12:46 PM   #22
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So far, my only whine about 20" wheels is that Ford recommends not using chains on them. I'll move heaven and earth to not tow an Airstream on snow again, but I would like to have chains for emergencies. My suspicion is the only issue is scratching of the rims.

I think I will buy some tire socks instead of chains.
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Old 12-19-2014, 01:43 PM   #23
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Quote:
Originally Posted by SteveH View Post
There are several 20" E rated tires built, but the only size that will fit the original poster's considered GM 2500 is the Goodyear Wrangler SRA. No other tire manufacturer builds it, and that IMHO is the problem.

Dodge Ram uses a larger Firestone tire that I have not heard anything bad about, but it may be too soon, but that tire will not fit the GM 2500 as it's too tall.

I guess I should modify my post to say that I can't find any load range E 20's in the size that is on my Tundra.
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Old 12-19-2014, 05:24 PM   #24
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Quote:
Originally Posted by dznf0g View Post
As you all know, I have driven quite a few hd2500s TVs. I have had both 18s and 20s on my demos. I note no noticeable difference in tow quality (ie. sidewall "waddle" etc.), but as Steve says, there are many more options with the 18"ers.

Thanks on experience. I doubt tire sizes on trucks will go down. That said, 19.5 LR-F and greater truck tires aren't going away I'd bet. Maybe 20 is where the thing will come to a rest.

I'd sure like to have the same tires on truck and trailer. But even 17's are too big to fit the TT.
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Old 12-19-2014, 05:39 PM   #25
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It is possible to have the same size tires on the truck and trailer if you have an older truck with 16's.
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Old 12-19-2014, 05:53 PM   #26
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Yeah, I think Bluto might be able to do that with Michelin XPS rib on his rig. All steel tire. I'd want to ask our tire engineers about a rotation schedule between vehicles; if such is feasible or advisable. But you have to admit it sure is attractive. Eight down and two up as spares.
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Old 12-19-2014, 06:41 PM   #27
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We do that with cargo trailers and 2007 Classic and earlier 2500HD Silverados and Sierras. Firestone TransForce HT 225/75R16's on everything- not the best tire, but $145-$165 each on our national account-
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Old 12-19-2014, 06:51 PM   #28
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18" vs 20" Wheels

Premium tire bought in fives every five years.
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