Tire size "size matters"?

[BlueBoy]

My Bluebird has 275 80 22.5 (front and rear the same) I had a chance on getting tires with more tread but they were 295 80 22.5
Ok so 295's are a little taller and wider. Should I have gotten the bigger size and not worry about the speedo and torque on the engine?

Eventually I will need to get some "newer" tires, just wondering price-wize is there a difference?
Would a more common tire be cheaper?
If yes, then what size is more common?

Thanks

[Albatross]

I think the 11R 22.5 (or something like that) is the most common tire size on buses... And on many other heavy vehicles.



And yes, the more common sizes are cheaper, because there are more of them, everyone has multiple kinds, and everyone is competing with each other. The last time I did anything with tires was several years ago, on my ranger, and I saved $100 and got a significant upgrade in quality by going from the stock tire size to a "full-size truck tire, despite them only being a little bit larger and wider. I told the guy what kind of tire I wanted to put on, and he quoted me at $800/set for the stock size, but when I told him to quote me on a full-size tire, it dropped down to $660 and change, and that was including a nitrogen-fill, which is more stable. Granted, bus tires are usually more along the lines of $800/axle, but the point is the same.

[s2mikon]

Did you check the weight ratings of the tires and compare it to your actual front axle weight? 295/80 r22.5 is close to a 12r 22.5. Weight ratings matter a lot for safety.

[BlueBoy]

So what is this telling us?
From what I can tell the tire size should be 255 80 22.5
And the tires on the bus now are bigger than what came on it from factory.
95 PSI cold
GVWR 29,000 is that what the tire should be rated at?
What is 10000 and 19000?
I'm not sure of the other stuff on there.


https://www.skoolie.net/forums/attac...1&d=1733106978

[desrtdog]

10,000 and 19,000 are the front and rear axle ratings, respectively. Yes - originally spec'd at 255 for tire width, so if you've got 275's then they are probably about 1.2" taller than the original.

I have 255 70R22.5's on mine and am pretty certain I could not put a taller tire on and still maintain clearances (on the rear, in particular), so that might be the same for you if going to 295's...

[BlueBoy]

Trying to find recommended tire width for the wheel width

Found this nifty tool

https://tire-calc.com/comparison/255...oogle_vignette

[BlueBoy]

And this so far.
https://www.wanderlodgeownersgroup.c...O%20WHEELS.pdf

[Albatross]

So it seems that you don't understand how tires are labeled.



Most tires are in metric sizes, first off. The first number is the width of the tire, in mm. The second number is what percentage of the width that describes the height of the tire from the rim to the outer edge. The "R" is used to denote a radial construction. The third number is the size of the rim, in inches; because 'Murica.


When it comes to tires, the things that really matter would be mating the tire's rim diameter to the wheel rim diameter; trying to fit an R17 tire onto a 16" wheel will not work, for example. The next thing is probably your tire's weight rating, compared to how much weight the vehicle is going to put on the thing. Beyond that, you'll also need to consider the speed rating of the tire, for passenger cars, although most heavy tires are generally not expected to be pushed beyond about 75-80 MPH. Lastly, then would come the clearance you have in your wheel wells, although changing tire size slightly generally won't cause too many issues, you'll rarely see some problems with low-clearance tires, or when you're trying to lift a jeep and throw some 35" tires on it.

[s2mikon]

Front steer tires are NOT a good place to cheap out. A tire failure at highway speeds can be disastrous for both you and other motorists. It's worse on a bus or motor home than an 18 wheeler. If you have a blow out on the rear you will damage stuff for sure but your chances of tipping it over are slim. You must know your actual axle weights to properly inflate your tires. All manufactures produce charts for loaded inflation pressures. Michelin has always stated that they need to be set at plus or minus 7 psi to get your best out of your truck tires. Their best tires have a speed rating of 75mph. I have some Chinese truck tires on one of my trucks with a speed rating of 81mph. I don't trust them over 60mph. Here in the oilfields the truck companies buy Chinese truck tires because of cost and the fact that most get wrecked by rocks and off road use. But they don't use them on the front. Fiberglass hoods are costly to repair.

[BlueBoy]

I was trying to find out what the maximum tire width I can use on a 7 1/2 inch wheel. 12” or 295mm is too big. And what’s on the bus is already one size bigger (or thereabouts) than what came factory so going bigger is probably not a good idea. Even if there is enough clearance to except a taller tire, if it’s too wide for the wheel it’s not going to wear evenly and/or have stability issues.

What is confusing is the aspect ratio changes and seems like there’s no rhyme or reason to what tires come in. They’re probably is but I’m not seeing it.

I have Goodyear tires on everything I drive.
My bus is going to be no exception. At least as far as quality goes.

[s2mikon]

Here is Michelin's page. I bought Continental's version, 295/80r 22.5. https://rvtires.com/catalogue/53962/...h-z-29580r225/ I hope this helps.

[nikitis]

Originally Posted by s2mikon

Here is Michelin's page. I bought Continental's version, 295/80r 22.5. https://rvtires.com/catalogue/53962/...h-z-29580r225/ I hope this helps.

Those continentals better be able to send your bus into space for $951 a tire.

[s2mikon]

Here is a link from Simple Tire listing today's price. When I bought mine in late 21 or early 22 they were 1000 bucks and change for 2 with mounting plus taxes. Look at the specs and you can see it is very good tire. They run very smooth and are quiet. Load range H (16 ply) and an 81 mph speed rating. In the oilfield they have been very resistant to chipping and sun rot and make a good front steer tire. Those tires take a real beating. And as per Conti. an 8.25" rim width is fine.

[BlueBoy]

Originally Posted by nikitis

Those continentals better be able to send your bus into space for $951 a tire.

Roads? Where we’re going we don’t need roads.