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Old 04-28-2016, 08:44 PM   #1
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275/80r22.5 TO 11R22.5

Need to replace the drives on My new 1998 HR Imperial. The tread wear is 95% but the sidewalls are cracked.
Has anyone ever upsized tires to a more common 11r22.5? Yes, they are bigger in diameter(1.3") and width but so much more available.

Just thought someone here will have some real world comparisons for me. I think they will fit and I cant think of any drawbacks to the increased wheel size other than loosing the low profile look which means little to me. Coach is powered by a 325hp 8.3Cummins and a 6 speed Allison.

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Old 04-28-2016, 08:57 PM   #2
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After some research I think the rim could be to narrow anyhow. Are the 275 70r22.5 the tire for the coach from the factory? Has there been any tire size changes since 1998 in the industry?

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Old 04-29-2016, 09:31 AM   #3
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275/80r22.5 TO 11R22.5

I have an Itasca coach with 275/80r22.5 tires. On my coach, I honestly think that extra inch of diameter of the 11r22.5 tire might be a problem. When dumping the suspension, there's not much clearance to the body work. Both sizes use an 8.25" rim.

After posting, I see you have 70 series tires. They are even shorter than my 80 series tires. I would stick with the OEM size. Also, the extra sidewall on the 11.00 might make your coach handle differently.
2005 Itasca Horizon 40FD
FMCA 428291
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Old 04-29-2016, 11:05 PM   #4
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I had to replace mine a few months ago and went with the 295 75r 22.5 because of availability and were cheaper in price. They are basically the same size tire.

Bruce & Teresa
2000 Foretravel U320 4010
Cummins ISM 450hp
Allison HD4060R 6 Spd W/Retarder
Bruce & Teresa
2000 Foretravel
U320 4010
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Old 04-30-2016, 08:35 AM   #5
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Three years ago I replaced the 295/80's on my drive axle with 11R22.5's [Continental HSR2]. They are on 8.25" wheels. I am very pleased with them and would recommend them to anybody as long as the weight is within the tires max load capability. It probably will be on a drive or tag axle, but maybe not on the front (I had to stay with 295/80 on the front, which is a 14,600 lb axle).

The 11R is a taller profile than an 80 series tire. It is about an 82 or 83 profile (sidewall aspect ration).

You may also need to run the 11R at a bit higher pressure to get the load capacity you need. Check the load inflation tables for your actual weights.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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