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 > Tire size confusion?

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The Beave

Georgetown TX USA

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Posted: 01/21/12 03:20pm Link  |  Print  |  Notify Moderator

Our Beaver Monterey currently has 255/70/22.5 tires. However the wall data plate indicates the correct size is 9R-22.5.

These are apparently two different tire measurement systems. I know that the 255/70/22.5 tire is the larger of the two sizes.

So what size would the 9R-22.5 tire be if measured in the same system as the 255/70/22.5?


The Beave
30' 1997 Beaver Monterey
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wolfe10

Texas

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Posted: 01/21/12 03:35pm Link  |  Print  |  Notify Moderator

The 9R is closer to the 255/80R22.5

http://www.michelinrvtires.com/michelinrv/tires-retreads/tireInfo.do?tread=XZE#

Click on Specifications.


Brett Wolfe
2003 Alpine 38'


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Jarlaxle

New England

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Posted: 01/21/12 07:24pm Link  |  Print  |  Notify Moderator

Actually, a 265/75 or 255/80R22.5 is a replacement for a 10R22.5. A 9R22.5 is replaced by a 245/75R22.5 or a 235/80R22.5. (A 295/75 or 275/80R22.5 replaces an 11R22.5.) In all cases the metric tire is a bit (about an inch) shorter.

I'd probably keep using 255/70's.


John and Elizabeth (Liz), with 3 nutty cats
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wolfe10

Texas

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Posted: 01/22/12 08:09am Link  |  Print  |  Notify Moderator

The Michelin XZE spec page:http://www.michelinrvtires.com/michelinrv/tires-retreads/tireInfo.do?tread=XZE

Click on "Specifications".

Suggest you read through all the specs, but Revolutions per mile is one of them:

9R 543
255/80 538

10R 517
235/80 555

topflite51

In The Desert of Nevada

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Posted: 01/22/12 09:02am Link  |  Print  |  Notify Moderator

If your rim width and clearance are satisfactory on the duals I would stick to the 255/70's also. They are a little shorter and a little wider, and can be found in higher weight capacity rating. Because of the fact of being shorter, they do turn more revolutions per mile, around 20 I believe.


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TexasShadow

Spring Branch, TX USA

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Posted: 01/22/12 10:49am Link  |  Print  |  Notify Moderator

The 255x70rx22.5 is a very good choice if it meets your needs because all the truck stops that carry tires will have them. This size is used on many over the road trailers and they have a good carring capacity. I use and am very happy with this size Toyo tires.


TexasShadow
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UltraKen

Ohio

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Posted: 01/22/12 05:18pm Link  |  Print  |  Notify Moderator

The best match to the OEM 9R/22.5s I found were 275/65 R22.5s.

See my notes in my signature below for some ideas about tire selection.


UltraKen
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jgtown

SoCal

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Posted: 01/22/12 06:33pm Link  |  Print  |  Notify Moderator

As long as your rims are within the width range allowed for the tire, you don't exceed the weight capacity of the tire, and you've got proper clearance all around and in between, you're fine. Some tires are very specific about rim width, others can go on a wide range of an inch or more.

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