275/70R22.5 to replace 235/80R22.5 Michelin

So it is done - changed from 235 80 22.5 to 275 70 22.5 Michelins. I got an extra 1240 lbs carrying capacity at the same ( 105) pressure. Tires now have 5 days and close to 1500 miles on them and performance is really good. Gas mileage may even have gone up slightly but a much better road feel with less steering wander and a more secure feeling. My view is well worth the $ 90 CAN extra per tire. Even got 2315 date codes so I am good for longer than I will drive this coach. No issues with clearances on an F-53 chassis.

We changed from 235 80 22.5 to 255 70 22.5 Continentals . Really happy with them ride great, higher load rating and a bigger footprint. Dually spacing not an issue.

Thanks All - good info-I had already figured out that the crappy US?Can $ exchange rate meant FMCA is not a saving for me, but I will have another look at the dual wheel spacing. My rims are 7.5 so that is not an issue. I am looking for replacement tires, not because they are worn, but because I do a Mexico trip each year and as Rob knows the roads have been worse this past year. That is why I am looking for more load capacity and I have had good experience with Michelin on my other vehicles. Additional comments still welcome.

I just switched from Michelin 235/80/22.5 XRV's to Toyo 245/75/22.5 M154 tires.
Same load rating & almost identical in size.
Also, no advantage for Canadians to use the FMCA pricing at this time with the US/Can dollar exchange rate. The FMCA price is about $400 US. A local Michelin dealer in Manitoba Canada last week priced this tire at $495 Can and installed. (not balanced). Simple Tire in the US prices the Toyo tire at $273 US but shipping has to be added.

I will never buy Michelins again. I had them on my truck & they had dry rot after 5 years.
I put the Goodyear G670's on my coach.

I upgraded from 255/80/22.5 to 275/70/22.5 and am very pleased.

You need to check some specifics before you decide to make the change.

My data is from the Michelin Truck Tire Data book, published January 2010. I have assumed that these spec's have not changed, but your tire dealer should have a current data book.

The 235/80R22.5 will have an overall diameter of 37.1 inches, turn 556 rev's per mile, and have minimum dual spacing of 10.3 inches. Approved rims are 6.75 and 7.50 inches.

The 275/70R22.5 will have an overall diameter of 38.0 inches,turn 545 rev's per mile, and have minimum dual spacing of 11.9 inches. Approved rims are 7.50 and 8.25 inches.

I think your most critical measurement will be adequate dual spacing. Measure center to center of one set of dual's and see if you have 11.9 inches or greater.

You also need to check your rim width.

The 275 will be wider. Be sure you have adequate clearance for the steer tires in a hard turn.

I hope this info helps.

Fred

Our 1998 Dutch Star Tires were upgraded by Newmar in a recall, when the vehicle was only a few Months Old .

They are 275/22.5 Tires which as stated by J Rooster are the same size used by many Semi Truck and Trailer operators.

Yes they are slightly harder compound than the RV Only Tires , but there is not enough difference to tell in My Butts opinion .

They are also much more readily available ,and in a variety of Brands compared to the Michelins, so I feel. Better knowing that I can find replacements everywhere I travel.

After 2 Michelin XRV 235/80/22.5 zipper blow outs. I changed them out for 275/70/22.5 Good Year G670's

After 10 years + they were replaced with another set of G670's
Only need to run them with 90 PSI where the Michelin's needed 110 PSI

Join FMCA and get the FMCA discount. I checked the 235s before I sold my Mountain Aire and I think they were about $400. each. I just got the set of 6 16" for my GMC MH for $950. and they were 2 weeks old when installed. I had to get the aluminum wheels separately to replace the original 16.5"

Hi,

One must consider dual tire spacing on the rear tires. You probably have space for an extra 1.5" wider tire in the front, but in the back the tires will sit about 1.5" closer together. Do you have that much extra space in the back, and still have 1" to keep the tires apart at the bottom, say when you have hit a nail, and one tire has lost 20 PSI pressure? If the tires rub against each other, you can find that you need to replace both of them!

I would stick with Michelin or go with Toyo tires. Avoid the 'cheap' brands. Also consider a vacation to Washington. The weather is great, and tire prices might be much more reasonable. It might save enough to pay for all that diesel fuel to get here.

Be sure to call the tire dealer, and state that you will not accept any tires more than 1 year old, and will be looking at the date codes. Then they will also check the date codes, and if they do not reduce the price by at least 15% for each year old, walk away from the 'deal' that will require you to replace the tires in only a couple of years. . .

Good luck,

Fred.