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Tire Size

What is a good cross to metric for a 9R-22.5?
1988  40' Grand Villa Cat 3208t

Re: Tire Size

Reply #1
It would be a 9.00x22.5 tire
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Tire Size

Reply #2
Look at 255/80/22.5 or a 255/70/22.5. Rim width is important.
Jim C.
coachfree, previous 1997, 1999, 2000, and 2003 Foretravels.

Re: Tire Size

Reply #3
255/80R22.5 is a good substitution/slight upgrade.  OK on 6.75" or 7.5" wheels.

Many of us have upgraded from 9R22.5 to the Michelin 255's-- so this is from experience, not just a chart.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Tire Size

Reply #4
I replaced our 9R22.5's with 265/75R22.5's. 
Dave and Kelli
1997 U295 40' Build #5188 CSGI
1995 U240 36' Build #4621 SBID-SOLD
2006 Jeep Wrangler Rubicon

Re: Tire Size

Reply #5
Are you having trouble finding the 9R ?  I like that size for the early light coaches.

Re: Tire Size

Reply #6
Yep 9R's are getting hard to find and the dealers want a bunch for them.
1988  40' Grand Villa Cat 3208t

Re: Tire Size

Reply #7
Probably not going to get any better, as manfactures trim down the number of tire sizes available at a reasonable cost.. ideal vs economics gets skewed pretty quickly, and then throw in again the local available factor.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Tire Size

Reply #8
Simple tire shows them .

Re: Tire Size

Reply #9
I don't understand why the 9R size is stiil around. Does it offer any advantages over the newer metric size?
David and Carolyn Osborn
1995 U320C SE 40' Build 4726 Feb 1995
FMCA 147762
Motorcade 17186

Re: Tire Size

Reply #10
 I believe it was one of the first radial truck size .  Many early trucks and  heavy RV OE size,  It is about 80% tall/39in +-, and narrow for the 6.5- 8 in wheels. 
 Perfect for my Bus.

Re: Tire Size

Reply #11
I believe it was one of the first radial truck size .  Many early trucks and  heavy RV OE size,  It is about 80% tall/39in +-, and narrow for the 6.5- 8 in wheels. 
 Perfect for my Bus.
But does it have any advantages over a 255/80 size?
David and Carolyn Osborn
1995 U320C SE 40' Build 4726 Feb 1995
FMCA 147762
Motorcade 17186

Re: Tire Size

Reply #12
Supply. No body makes the 255/80/22.5  Michelin? 

Re: Tire Size

Reply #13
Available, available, available. If you have a roadside tire issue your not going to be able to wait for someone to source a tire, you are getting towed to a safe place, vs a tire service doing a roadside swap.  If you have a place to store a spare it's a different story. Or you may or may not be able to limp in with a different size. Optimum vs compromise, your roll of the dice.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

 

Re: Tire Size

Reply #14
Supply. No body makes the 255/80/22.5  Michelin? 

Yes, the 255/80R22.5 is a Michelin only size. 
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020