Changing Tire Size

[2puttchuck]

Has anyone switched from a factory tire size of 275/80R22.5 to 295/75R22.5. Tire sizes almost identical only about 3/4" wider. My only concern is the dually spacing of the rear wheels. Thoughts?

The reason is I need a 'H' rated tire and moving to a 295 really opens options.

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Thanks

[tropical36]

2puttchuck wrote:

tropical36 wrote:
Why is all this necessary and has the coach manufacture not provided the proper tire, for carrying the rated GvWR?
Possibly for wanting to carry the given weight, running lower pressures or what?

Monaco did their part...kind of, it's an H rated tire which does fine for the GVW, however in the size they put on there I only have two tire choices both of which I don't feel like the cost/value is there.

Gee, I thought there were quite a few manufactures out there with that size and one that seems to be pretty popular these days.
Also with many years of having a good reputation in producing a good product.

[2puttchuck]

An update; I found a Uniroyal RS20 in the 275/80R22.5 that is the "H" rated and got them for $340.00 each. I'm going to give them a whirl on the drives and see what happens. Will report back if less than stellar.

[mike2wheels]

Our Endeavor came from the factory with 275, but had 295 on it when we bought it. I was concerned when I learned of the switch, but I've checked the clearances and everything seems to be working ok.

[2puttchuck]

tropical36 wrote:
Why is all this necessary and has the coach manufacture not provided the proper tire, for carrying the rated GvWR?
Possibly for wanting to carry the given weight, running lower pressures or what?

Monaco did their part...kind of, it's an H rated tire which does fine for the GVW, however in the size they put on there I only have two tire choices both of which I don't feel like the cost/value is there.

[rgatijnet1]

In some cases, going to a higher load rated tire may actually cost less per tire, depending on the quantity manufactured. If you have had your coach weighed and know the proper tire inflation pressure, going to a higher load rated tire will still keep the inflation pressure the same.

[Bruce_Brown]

tropical36 wrote:
Why is all this necessary and has the coach manufacture not provided the proper tire, for carrying the rated GvWR?
Possibly for wanting to carry the given weight, running lower pressures or what?

You must have missed where the OP said

"The reason is I need a 'H' rated tire and moving to a 295 really opens options."

In our case it was my opinion our engine was turning too many RPMs, and according to the Cummins engine calculator an upside looked to be a good option. Our MH had an abundance of power, I'd gladly give up some power for the projected increase in MPG. 2 years later I'm 100% pleased with our choice.

[wolfe10]

The 275/80R22.5 to 295/75R22.5 is a VERY common substitution.

The 275/80 is pretty unique. Most other manufacturers only have the 295/75.

I agree, very little chance of interference with the small additional width. BUT, for those who have "fine tuned" their cut angles (easily adjusted on Sheppard steering boxes) they may need to make minor adjustments. Been there, done that.

[tropical36]

Why is all this necessary and has the coach manufacture not provided the proper tire, for carrying the rated GvWR?
Possibly for wanting to carry the given weight, running lower pressures or what?

[Bruce_Brown]

You should be able to find the minimum dual spacing information on a tire chart somewhere. That would completely answer your question.

A few years ago we went from 275/70/22.5s to 11R/22.5s. The 11Rs are a bunch taller so there was a lot of researching done before we made the move. Fortunately there is a lot of info out there, although sometimes it takes looking in a few different places to put it all together.

[2puttchuck]

Scott, same issue with the XRV tire.

As always the collective knowledge here is like no other. Appreciate it guys!

[wa8yxm]

Can not address the spacing however they do make a special "Spacer" (Washer) that may fix it if your lugs are long enough and you have the fender space.

That's about all I can say.

[LaTriker]

I changed last year from Goodyear G760 275/80R 22.5 to Toyo 295/75R 22.5 Load Range H. New tires were not wide enough to cause any issues with duels. Changed my odometer v. GPS by one mph at 65 mph. Have not had any tire issues over the past year.

[FIRE_UP]

2putt,
I'd seriously surprised if there were any interference problems with that little of size change in tires. With such a small amount of increase in any of the dimensions, I'd bet my house you're gonna no issues at all. A while ago, as in this time last year, I was in need or new tires. I had the junk Michelin 255 80R 22.5 XRV tires and they were cracked and shot. So, I wasn't about to make the same mistake the previous owner did and, I started shopping around and looking at what else I could use.

Well, long story short, I came up with some 265 75 22.5 Yokohama RY-103 tires and, like your comparisons, the size difference in any and all dimensions, was minute. I've had them on for almost a year now and, couldn't be happier. Not one single bit of clearance interference anywhere, at any time.
Scott

[wolfe10]

Chuck,

Yes, a common interchange.

Do check that you have the clearance for the slightly wider tires on full front cut angle. I would be surprised if this was a problem, but you need to verify that you have adequate clearance with the current tires to accommodate the added width.