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Old 02-21-2019, 12:51 PM   #1
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Location: SW FLORIDA
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Tires for 2003 Diplomat 38 ft

We have a new to us Monaco Diplomat 2003 38 foot diesel pusher and need to replace the tires. Present tires are Michelin 275 70 R 22.5 and that is the size I understand was standard on this coach. The former owner replaced them in 2012.

If you have a similar coach and have replaced the tires with a different size tire, what size did you use and did the tires fit satisfactorly--no rubbing between duals, finder wells, motor home side, etc. ?
My research indicates that 295 75 r 22.5 is likely the best fit for replacement. I realize the tire is approximately 2 inches larger diameter and 1/4 inch wider--thus the reason for the question.

We appreciate any comments. Thank you
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Old 02-21-2019, 01:53 PM   #2
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Here is a handy tool for comparing tire sizes.
Have you looked at the FMCA tire discount program?
2008 Newmar Mountain Aire
450 HP Cummins ISM 4000MH Allison Trans.
Towing a 2014 Honda CRV with a Blue Ox tow bar.
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Old 02-21-2019, 02:44 PM   #3
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I as well as many others on here have gone with Sumitomo ST727ís in 275/70R22.5
You should able to find them locally for approx $300 each plus balancing and mounting.
They are great tires for RVís and rarely fail. Used by many trucking companies as well. You will want the H/16ply rated model, which is M speed rated (81mph). Sumitomo part number 5530596
Craig and Carol
2005 Monaco Knight 37PBD
2002 Jeep Wrangler as the TOAD
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Old 02-22-2019, 07:05 AM   #4
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I replaced mine with Firestone FS561 275/70/R22.5
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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Old 02-22-2019, 03:32 PM   #5
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We have run Firestoneís 275/75 good ride and millage
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Old 02-22-2019, 03:33 PM   #6
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Had great luck with Firestoneís
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