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Old 07-19-2006, 01:00 PM   #1
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This is for all of you Winnebago/Itasca DP owners that have switched to the G670 275/70R22.5. I have a 03 36ft Horizon that has 235/80R22.5 XRV Michelin tires. When I switch I will go to the G670s in either the 255 or 275 size. I have had zero problems with the XRVs in 35,000 miles but the main reason I am going to switch is because of the experiences I have heard and read about over the years and the lack of ability to replace XRVs on the road in an emergency situation.
I have read all of the relevant threads posted over the last two years but still have one basic question. Why did you choose to use the 275 size instead of the 255? The only difference that I can see between the two sizes, other than the obvious width difference, is the weight rating. Even for those owners with 10,500 lb. front axles the 255 seems to be a more than adequate tire. When I last had my unit weighed at a FMCA rally I was 2,000 lb. below the CVWR. I was on my way home after spending the winter in the coach and and had all of the bays full of the usual stuff. I seems the 255s will give me all of the weight margin I could need.
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Old 07-19-2006, 01:00 PM   #2
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This is for all of you Winnebago/Itasca DP owners that have switched to the G670 275/70R22.5. I have a 03 36ft Horizon that has 235/80R22.5 XRV Michelin tires. When I switch I will go to the G670s in either the 255 or 275 size. I have had zero problems with the XRVs in 35,000 miles but the main reason I am going to switch is because of the experiences I have heard and read about over the years and the lack of ability to replace XRVs on the road in an emergency situation.
I have read all of the relevant threads posted over the last two years but still have one basic question. Why did you choose to use the 275 size instead of the 255? The only difference that I can see between the two sizes, other than the obvious width difference, is the weight rating. Even for those owners with 10,500 lb. front axles the 255 seems to be a more than adequate tire. When I last had my unit weighed at a FMCA rally I was 2,000 lb. below the CVWR. I was on my way home after spending the winter in the coach and and had all of the bays full of the usual stuff. I seems the 255s will give me all of the weight margin I could need.
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Old 07-19-2006, 03:08 PM   #3
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I believe the high number of Michelin failures has to do with their large market share and their poor bed side manner in dealing with people who can't accept reality' who then post their personal travesty on every forum they can find (they're the ones with a "1" in the post count column). I've had excellent luck with all the Michelins on various motorhomes and trucks. I can't stand their political stance in the world but their product is good.

I've done extensive personal study on the correlation between large rubber tires and the male hormone
testosterone. I think it's the reason I need to wear glasses.

The two tire sizes you posted have a 1/l0th of an inch difference in diamenter.

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Old 07-19-2006, 04:30 PM   #4
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I have also been a long time user of Michelin tires. However, over the past several years I have asked a number of dealers who carry the Michelin brand if they had 235 XRVs in stock and they always say no and they also say no one ever comes in to ask for them. I would think that someone at Michelin would wonder why they sell so few replacement 235s.
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Old 07-19-2006, 05:30 PM   #5
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Flier:

I chose the 275/70's after consulting with two Wingfoot tire dealers and several more experienced folks on this forum. The spec sheets I reviewed revealed that the 275 G670's were nearly identical in diameter and I thought the additional width would improve handling.

At any rate, the coach drives like a different (better) machine with the G670's. The difference was immediately noticeable after adjusting the pressures based on my actual weights.
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Old 07-19-2006, 07:32 PM   #6
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I wonder if the Goodyear RV tires will stay balanced any better the their auto tires. I've taken Goodyear tires off the last 4 new cars and tow vehicles I'v purchased within the first 6-10,000 miles because they just don't stay balanced. I've replaced them with Michelins and only balance them every 2-3 years and 15,000-20,000 miles. I currently have l7,000 miles on my new coach with XRV tires and undoubtedly not enough miles to experience any of the problems I'm reading about. Sounds like the G670s are good tires.
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Old 07-19-2006, 10:52 PM   #7
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Here is my 2 cents. The 235/80 22.5 is designed for a rim that is 6.75 to 7.5 inches wide. A 255 is designed for 6.75, 7.5 to 8.25. 275... 7.5 to 8.25.

How wide are your stock rims?

If they are not 7.5 inches wide IMHO I would not make the switch up to 275's but would try the 255's.

The 255's will be shorter by approx. .7 inches. 275's are .5 inch taller.

Michelin is a good tire. Failures were most likely caused by too low of air pressure. The 235/80 22.5 doesn't have a large safety margin, i.e. the air pressure needs to be near or at max psi and just a little loss of air in that small tire corrolates to a larger loss of air pressure compared to a bigger tire....larger envelope.
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Old 07-20-2006, 02:40 AM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">I've done extensive personal study on the correlation between large rubber tires and the male hormone testosterone. I think it's the reason I need to wear glasses. </div></BLOCKQUOTE>


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Old 07-20-2006, 03:19 AM   #9
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Used Equal balancing powder on my G670's. They run smooth, no problems at all.
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Old 07-20-2006, 08:55 AM   #10
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Since the basic question seems keep getting lost I have to wonder if anyone out there has a good answer. If you have a Winnebago DP you know that I have 7.5 rims and I am not interested in how anyone balances their tires. I would just like to have some honest justification for choosing the 275 G670s over the 255. Also, one comparison number is revolutions per mile and the 235 is in the middle between the 255 and 275. Does anyone have a good reason or did it just "feel right"? Don't mean to sound testy but there are a lot of opinions and not much fact, to date.
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Old 07-20-2006, 09:04 AM   #11
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As I indicated, my decision was based on the recommendation of the tire vendors..told them what I had, they both said replace with 275's. Review of specs. for both the Michelins I had (235's) and the G670's I wanted, including width of rims, supported their recommendation. I have checked my speedo since changing against my GPS speed...speedo is right on. I also wanted the added safety margin (weight carrying ability) of the bigger tires.

I can't see why you would not go to the 275's unless there is significant savings.
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Old 07-20-2006, 12:14 PM   #12
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What's the aspect ratio on the 255's ?
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Old 07-20-2006, 03:33 PM   #13
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I replaced my XRVs 235's with Michelin XZA-1 275/80/22.5....the reason for the 275s vs the 255s is simply that I wanted all the reserve safety room I could get....I have the 7.5 max rims and all is well...The coach drives much better than when the 235's were on...I run 100# all around....Michelin now makes a 275/70 tire but 2 years ago I could only find the 275/80 which gives me a little higher sidewall and less rpms than the 235s. RKL
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Old 07-20-2006, 04:35 PM   #14
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smlranger: I have no arguement with your choice, just trying to get smarter. I also have not checked on the price differential between the 255s and 275s. All of the critical specs for the two sizes are very close to the 235s. The main difference between the two sizes of Goodyears is load capacity. My coach's GVWR is 26,850; 9350 front and 17,500 rear. The 255s will support 11,020 front and 21,280 rear; 32,300. The 275s support 13,880 front and 25,580 rear; 39,460. I am just trying to understand the reasoning behind purchasing tires that support loads so far beyond the capacity of the coach. It would seem that if I am a vendor and the larger tire will fit I will try to sell it because of the larger overall profit. Just trying to be a smarter consumer.
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