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Old 04-16-2019, 01:38 PM   #1
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275/80 to 295/75 tires on 05 Vectra?

Anyone switched their setup this way? We will have to put tires on the rig next year and I like to do as much research as possible. Current tires are Michelin XZE2 275/80R22.5 which is the OE size for the rig. Looking at going to a 295/75R22.5 as are a more common size that provides more choices (like Toyos) and are more reasonably priced. I ask this question because the rear tires, especially the left rear, are already pretty close to the fender opening and if I can avoid doing damage to the fender or having to do bodywork would be ideal. Overall diameter is very similar, they are just wider by about 1/2" compared to the 275/80.

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Old 04-16-2019, 02:49 PM   #2
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When I did the calculations, it appears that he 295's are .8" wider. I'd round up to 1 inch then divide that in half. Add the 1/2" to your existing tires and see if they will clear the fender. Actually I'd allow a bit more room for tire deflection. Also remember, tire size charts are not perfect. The actual tire may be larger or smaller than the chart information
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Old 04-16-2019, 02:56 PM   #3
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Quote:
Originally Posted by ElCaminoManT View Post
Anyone switched their setup this way? We will have to put tires on the rig next year and I like to do as much research as possible. Current tires are Michelin XZE2 275/80R22.5 which is the OE size for the rig. Looking at going to a 295/75R22.5 as are a more common size that provides more choices (like Toyos) and are more reasonably priced. I ask this question because the rear tires, especially the left rear, are already pretty close to the fender opening and if I can avoid doing damage to the fender or having to do bodywork would be ideal. Overall diameter is very similar, they are just wider by about 1/2" compared to the 275/80.

Thanks
I have an Itasca Ellipse (winnebago Tour) with tag. It came with Michelin XZA2's (8 of them). 295/80 r22.5. I can't complain. Beautiful tires. But at $600 a tire there must be something comparable out there. But it wasn't easy to find too many 295/80 r22.5's out there that met my price paramater. So I looked at 18 wheeler tires. And found some Iron Man 295/75 r22.5's. I'm not a tire expert but I reasoned that since I have Air suspension, and my rig Raises up 4-4 1/2 inches I have enough clearance for the 1.2" difference (295/80 and 295/75). When the rig is parked and off the clearance between the upper tire (tread) and the wheel housing (fender) is 2 1/2".
Also if you have any doubts you can always call Freightliner or whoever the maker of your chassis is.
If you find that the width will be an issue, I would look into some Truck tires (18 wheelers) like Hercules, Iron man, Cooper, power king, Samson, double coin. Uniroyal has good deals to. Just regulate the tire pressure for ride stiffness or softness. Since I have air ride suspension It wasn't really an issue to me. I love my 18 wheeler tires. LOL. Hope this helped a lil. Good luck.
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Old 04-17-2019, 05:43 PM   #4
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Not a Vectra, but I made the swap on my 03 Ultimate several years ago. I have had no problems at all with the change. I am currently running Continental HSL2s. According to my notes 275/80R22.5 is very close in size, width, etc to 295/75R22.5 BUT the two sizes should not be run in a dual pair. 295/75R22.5 is 0.25% bigger in overall diameter and circumference than 275/80R22.5. Replacing 275/80R22.5 with 295/75R22.5 would raise the vehicle by 1.25mm (0.05 inches).

275/80
Dia - Width - Spacing - Wgt Spd
40.1 11.2 12.5 110 75

295/75
Dia - Width - Spacing Wgt Spd
41.3 11.8 13.2 126.3 75
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Old 04-17-2019, 06:05 PM   #5
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My 04 Horizon is on its 2nd set of the 295s. 1st were Bridgestones, they rode and wore great. I got a good deal on Toyos for the 2nd set in June.

They clear OK, be sure you park with the wheels straight and are aired up before turning the wheel.
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Old 04-26-2019, 02:07 AM   #6
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We have the same coach so let me share my experiences when it comes to new tires:

* Next to buying batteries, I don't like buying tires at all, but if you consider how much time you spend on the road, and the fact you will only buy one set in your lifetime, then I suggest you don't go cheap... and don't wait!

* My coach came with lots of good rubber, but the date codes were approaching 10 years.

* I had Goodyear 295-75-22.5 brand tires, but found they were stiff on the road. I also have one of those fancy $10,000 HWH "Active Air" systems, but even so the Michelin tires 275-80-22.5 were superior in every respect. ...BUT as I learned the hard way, not all Michelin's are created equal.

* My conclusion: Don't buy the Michelin RV tires or so called "Multi-Energy Z". These are inferior tires in my opinion and on my coach these tires caused a humming-road-noise right at 55-MPH that drove me crazy; and for the most part it did not matter what surface I was driving on.

* So I filed a Michelin claim (which you need to do), talked with the Michelin 800# office, never talked to the sales rep who the case was assigned to; and just like that the Portland Michelin dealer at Superior Tire took off all the Michelin RV tires and replaced them with the X-line Energy "STEER TIRE"...and what a world of difference!!!

These TRUCK "STEER" TIRES were quiet on the road, and now I glide down the road. These steer tires also grip the road better and feel safer on corners and any side-to-side action... so much so that you would swear you put on an different manufacture's tire.

* Don't compare Michelin tire quotes by contacting Les Schwab. They are Toyo dealers and will up-charge you ~$1,000 over the same Michelin tire you can get from an authorized Michelin dealer.

* Try to buy your tires in Oregon where you don't have sales tax. And shop around. Montana does not have sales tax, but were $700 more expensive than Portland, Oregon.

* I paid $3,850 out the door for new stems (and everything tire related) for the Michelin RV Multi-Energy Z 275-80-22.5 at Superior Tire in Portland, OR, but then Michelin Corporate authorized the dealer to put the X-Line Energy "Steer Tires" on my RV at no extra cost. My guess is that this would have added another $100/tire, but I can't say for sure.

* And all the other Michelin quotes I got in 4 other states were in the $5,000 range... due to the sales tax of 6-8%. (So save yourself ~$300 and get your tires in Oregon.)

* And I suppose I would try Toyo if they were at least $1,000 less, but they aren't.

So get happy. Get Michelin high quality steer tires and you love the hours and hours you drive down the highway. And after 3 months of driving on Michelin's steer tires you will not want to drive on anything else.

PS I did not find my miles/gal improved; so I wouldn't buy a tire that claims your will get 5-10% better fuel efficiency. This is bunk in the 30,000+ lb weight class.

PSS I am a big fan of adding those "Equal" tire balancing bags you put in the tire (10 oz) so you do not need to add tire weights. And if discuss this with the tire dealer, maybe they will drop their price $100 since they do not have to spend time balancing the tire. (Nah!)
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Old 10-19-2019, 11:59 PM   #7
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Follow up here, I've decided to replace the steer tires this year as they're starting the infamous Michelin cracking and I'll replace the drive tires next year, helps ease the pain since we ended up buying our first house a couple months ago. While doing my late evening internet perusing and research, I discovered the 275/80 XZE2 Michelins on the moho measure out to EXACTLY the same as the 295/75 M137 Toyos. Found this past week that tiresdirect.net is running a special on the Toyos at about $50 less per tire than everywhere else I checked AND free shipping so I ordered up a pair. The tires are coming directly from Toyo so hopefully that means they'll be a nice fresh set vs ones that have been sitting at a warehouse somewhere for a year or more like simpletire seems to do. Have a shop here locally that will mount and balance them up for me for a fair price as well.
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Old 10-20-2019, 08:03 AM   #8
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I made the switch several years ago. They are not quite identical in size but they are very close. According to the charts, 295/75R22.5 is 0.25% bigger in overall diameter and circumference than 275/80R22.5. After the switch, the mh supposedly stands .05" taller. The only precaution I would give is do not run the two sizes together in a dual pair.

The 295's will likely require higher psi than the 275's for the same weight. Verify your required psi on the tire mfger's charts.
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Old 10-20-2019, 08:18 AM   #9
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I have the exact same coach as you and I bought the Toyos a few years ago. No issue, but when parked if not jacked up the passenger side on the rear just touches the fiberglass. However when on the road there is about an inch of play. I have had zero issues. Had about every other issue mentioned on the site, but no tire issues since changing.
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Old 10-22-2019, 01:04 AM   #10
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Quote:
Originally Posted by AFChap View Post
I made the switch several years ago. They are not quite identical in size but they are very close. According to the charts, 295/75R22.5 is 0.25% bigger in overall diameter and circumference than 275/80R22.5. After the switch, the mh supposedly stands .05" taller. The only precaution I would give is do not run the two sizes together in a dual pair.

The 295's will likely require higher psi than the 275's for the same weight. Verify your required psi on the tire mfger's charts.
According to the Michelin specs chart, the 275/80 XZE2s that are on it now are 40.2" tall and 11.1" wide with 22/32" tread depth when new. The Toyo chart shows the 295/75 M137 are 40.0" tall and 11.1" wide with 15/32" tread depth. The 295 Toyo is ever so slightly shorter but that's so close it's nearly a moot point. For sure like you said tho, never run two sizes in a dual pair. My plan is doing the 2 steer tires this year and then the 4 drive tires next year.

Also, both list the same 6,175lbs max load in single fitment at 110psi.

Quote:
Originally Posted by wstalker View Post
I have the exact same coach as you and I bought the Toyos a few years ago. No issue, but when parked if not jacked up the passenger side on the rear just touches the fiberglass. However when on the road there is about an inch of play. I have had zero issues. Had about every other issue mentioned on the site, but no tire issues since changing.
Good to know. The left rear is the tire that is nearly touching on mine when it airs down after sitting for a couple days. I always make sure my fronts are straight as well and the rig doesn't move until the governor cycles off at full pressure/ride height.
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