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Old 05-24-2015, 03:09 PM   #1
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Dumb question: Are front and rear wheels the same?

There's been lots of discussions about the merits of carrying a spare tire (I carry an unmounted spare in my basement). I've been asked why i don't get an extra wheel so I can carry a mounted spare. The reason is that I don't think a mounted tire would fit, the unmounted tire is a pretty tight squeeze. But I was thinking, are the front wheels and rear dualies even interchangeable? It doesn't look like it. Seems like another reason to not bother with a mounted spare.
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Old 05-24-2015, 03:17 PM   #2
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On an A chassis, they are different which is why you carry a spare tire instead of a mounted spare
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Old 05-24-2015, 03:49 PM   #3
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It varies. All 6 wheels and rims are identical on my MH. The inside dual is mounted the same as the front wheels, the outside dual rim is mounted facing the hub. }{
But- Some RV's with polished rims are only polished on the show side which would be a consideration aesthetically but would function okay. 3rd case is some have aluminum rims for show and a steel wheel for the inside dual..
Hope this helps. If you have roadside service they can mount an unmounted spare....Most 22 inch tires are very heavy.
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Old 05-24-2015, 03:51 PM   #4
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On any Class A and Class C I've ever owned, they're the same. Of course outer wheels are usually polished aluminum and inners on the rear are steel so the manufacturer saves a few bucks, but a mounted spare should fit anywhere.
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Old 05-24-2015, 04:21 PM   #5
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On ours, the front tires are a different size than the duals and tags.
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Old 05-24-2015, 06:34 PM   #6
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Look at the tire size on the front and rear wheels. If the tires are all the same size, I would think the wheels are too. But the best way to find out, is to call the chassis manufacturer, and ask.

My wheels and tires are all the same size, and I have been carrying a mounted spare under the motorhome, between the frame rails, just aft of the fuel tank. Is mounted to a fabricated carrier that is mounted to the rails. Never needed it, but if I ever did, the roadside service guy will have no trouble retreiving it, and putting the damaged tire back up in place.

So maybe check to see if you have room under your chassis, and do something similar.
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Old 05-24-2015, 06:41 PM   #7
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Quote:
Originally Posted by jondrew View Post
There's been lots of discussions about the merits of carrying a spare tire (I carry an unmounted spare in my basement). I've been asked why i don't get an extra wheel so I can carry a mounted spare. The reason is that I don't think a mounted tire would fit, the unmounted tire is a pretty tight squeeze. But I was thinking, are the front wheels and rear dualies even interchangeable? It doesn't look like it. Seems like another reason to not bother with a mounted spare.

Short answer is yes. Class A motorhomes will use the same wheels on all axles. There is some small possibility of a mix of wheel width if there is a mix of tire sizes but not a usual situation. On the drive axle, the inner wheel will be mounted as the steer axle and the outer wheel will be reversed so the convex sides meet.


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Old 05-24-2015, 06:43 PM   #8
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My wheels and tires are interchangeable. But, I have seen some posts on this forum that some coaches have different a sized fronts and rears.
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Old 05-24-2015, 06:43 PM   #9
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Our tires are the same size, so the wheels are the same size also. However, the inner drive axle wheels are steel, whereas the rest of the wheels are aluminum--a very common practice. If the tires are different sizes--steer and tag axle tires are a larger size on some coaches--the wheels are often wider for the larger tires.
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Old 05-24-2015, 06:59 PM   #10
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My Ford Gas chassis has the same size tires at all points. However; the 2 front and outside rear duals are aluminum wheels, the 2 inside duals are steel wheels. I started looking into a spare about a month ago and assumed an aluminum wheel would be the thing to buy. What I found out from folks on this forum is the aluminum wheels are about twice as thick at the lug area than the steel wheels . In my application using 2 aluminums on the rear duals would push the outside dual out to the point it would be supported only by the lugs and no hub contact. So in my case I am searching for a proper steel wheel, it will work at all points. Just something to be aware of before you buy, if you happen to have steel inners.
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Old 05-24-2015, 07:22 PM   #11
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I'm not going to change a tire on my coach. The guy CoachNet sends will be equipped and trained to do that. I'm told a mounted 22.5 in tire weighs about 250 Lbs. My coach lives every day at max gross weight; another 250 is not happening. For all these reasons I see no need to carry a spare.


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Old 05-24-2015, 09:57 PM   #12
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the 22.5 inch aluminum rim at 7.5 inch wide is same front and back they r marked front and back.the difference is the valve stems, one points in the other out .you have to unmounted the tire to change them.the 235 80r 22.5 tire is some times hard to find.i just searched for 2 because of cuts in them still waiting .was told anywhere from 1 week to 8 to 10 weeks.and Michelin has the marked cornered on them. luckily in no hurry
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Old 05-24-2015, 10:02 PM   #13
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Our front and tag take 365/70's on 10" wide wheels, the drive axle takes 315/80's and they're 9.0" wide. All tires are Load Range L.
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Old 05-24-2015, 10:05 PM   #14
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If you have a different size tire on the front as opossed to the rear, I would have a spare that would be the same size as the rear so they will match on the duals. In a pinch you could use it on one side on the front to get you to a tire shop.
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