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Old 07-26-2014, 08:30 AM   #1
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Tire sizing

I have a 2004 40 foot inspire. My current tire size is 275/70 r22.5 Goodyear. I would like to buy all new tires and had indication that my current tire size was a little undersized. I have a good price quote for Continental 275/80 r22.5 HSR 2's. I fount a tire comparison chart that indicates the larger tire size would make me 1 inch taller and make my speedometer read a few mph off.

Has anyone went up in tire size on a similar rig? And what is your advise?

2004 Inspire number 51034

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Old 07-26-2014, 09:46 AM   #2
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Jim, check your owners manual for the recommended tire size and buy that size tire. If you have a Allison 3000 transaxle then the gearing is to the size of tire as recommended by the chassis builder.

If you change tire sizes and increase the size, you'll experience a loss of pulling power, more stress on the transaxle and as stated, an incorrect speedometer.

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Old 07-26-2014, 05:08 PM   #3
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I believe the recommended tire for your 2004 Inspire is the same as my 2005 which is 11R22.5, check the sticker on the inside of the vanity mirror. If that is the case, your current tires are likely undersize. I found that 295/80R22.5 tires are the same diameter as the 11R22.5. I'm running 295/80R22.5 Bridgestones and am very happy with the performance. The increased load rating of the tires over the 11R allows me to run less air pressure (per the tire specific chart) to handle the rated axle loading which results in a better ride.

Our motorhomes do not have trans-axles, they have transmissions and differential third members.
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Old 07-26-2014, 05:16 PM   #4
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If I recall properly, although the tire may have the same numbers the size of the tire varies by manufactuer. A one inch difference in size equals only a half inch so to me it would not be a problem.

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Old 07-26-2014, 05:25 PM   #5
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Most tire manufacturers have charts that include the number of revolutions per mile for a given tire. For example, the Toyo M154 295/75R22.5 that I run is listed as 514 revolutions per mile. The Toyo M154 11R22.5 is listed as 500 revolutions per mile - a difference of about 3%.
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Old 07-26-2014, 05:31 PM   #6
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Down by the driver's seat you should have a sticker that shows what the factory recommended tire and inflation pressures are. I would recommend you stay with that size tire. Check your maximum axle weight, and make sure the weight rating on your tires meets or exceeds the maximum axle weight. Some tires come with different load ratings that will allow you to stay with the same size tire, but with a higher load rating.
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Old 07-26-2014, 05:32 PM   #7
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My recent research with tires revealed a few "comparisons" between std 22.5 sizes--not withstanding manufacture claims. For example: an 11r and a 295 80r about the same diameter; a 275 80r is about the same dia as a 295 75r [which came on my 03 Alpine]. Over the last few years, I have run both 295 80rs and 11rs on my coach--both being about an 1" larger in dia than the original 295 75rs. Result--slightly lower RPMs at speed; 5% less on odometer reading and 3% less on speedometer; no difference in apparent power or torque. Guessing the diff between a 275 70r and a 275 80r is about the same....
Dont know much about Continental but recommend you also look at Bridgestones, and also Michelins under the FMCA deal.
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Old 07-28-2014, 02:02 PM   #8
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My coach came with Good Year 295/80R22.5 and I went through FMCA and got a new Michelins all around save around $225 per tire.
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Old 07-28-2014, 06:56 PM   #9
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Originally Posted by 2 Stroker View Post
My coach came with Good Year 295/80R22.5 and I went through FMCA and got a new Michelins all around save around $225 per tire.
2 stroker

2 Stroker, I see by your profile you have a 2006 40 foot Inspire, mine is a 2004 and it came with 275/70 R 22.5's and my info on plate by drivers side says tire size should be 275/70 R 22.5's. I have heard that CC was using these smaller size in the 2004 era and it was causing problems, I just can't verify that for a fact and needing to buy new tires. just hate to make mistake on sizing. I have seen price list for FMCA plan. I am not member but maybe should be.


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