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Old 04-13-2013, 09:15 PM   #1
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22.5 vs 19.5 Tires

What are the advantages of a motorhome with the bigger tires. Do you get a better ride etc?? I know some manufactures went to a bigger tire and was wondering why?
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Old 04-13-2013, 09:23 PM   #2
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I would think the main difference is load capacity.
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Old 04-13-2013, 09:24 PM   #3
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I have a 38' gasser with 19.5s don't know if it rides any different than 22.5. But I do know its time to replace tires and I am glad I have the 19.5s they seam to be cheaper. You should change to new tires after 5 to 7 years even if there not worn out a couple bucks here and a couple there all adds up
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Old 04-13-2013, 09:25 PM   #4
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I want to hear the results of this one too.

My thoughts are that with the larger tire you would increase your weight capacity and get a smoother ride.

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Old 04-13-2013, 09:32 PM   #5
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Same concept as automobiles. A little better ride but mostly for weight of the Vehicle. A bigger tire carries more weight.
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Old 04-13-2013, 09:54 PM   #6
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My coach was available with two chassis options: Ford with 19.5, and Workhorse with 22.5. From researching and driving both:

Larger tire:
  • Greater weight carry capacity
  • Maybe smoother ride (other variables apply of course)
  • Larger tire chassis had another step at the entry
  • More difficult to find space carry a spare
And of course cost more when it comes time to replace.

YMMV
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Old 04-13-2013, 10:07 PM   #7
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19.5 tires/wheels look to small and 22.5 tires/wheels look better.

You always get a smoother ride with larger tires plus more load capacity. The larger tires on a gas chassis typically do not turn as sharp the smaller tires.
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Old 04-13-2013, 10:49 PM   #8
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...if your coach came with 19.5's your rear end ratio is around 4.30,however,if the coach came equipped with 22.5's originally,the ratio will be much lower such as 5.30....tires and rear end determine the final drive ratio...I would think it would be better to stick with original equiptment size! ...just my .02 !!!....safe travels!
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Old 04-13-2013, 11:40 PM   #9
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I really could not tell you for sure since ours has 24.5's. I do know we have a large amount we can carry even with a 200 gallon fuel tank full and we can tow a lot too.
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Old 04-14-2013, 06:53 AM   #10
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Quote:
Originally Posted by Mody n Domy View Post
I have a 38' gasser with 19.5s don't know if it rides any different than 22.5. But I do know its time to replace tires and I am glad I have the 19.5s they seam to be cheaper. You should change to new tires after 5 to 7 years even if there not worn out a couple bucks here and a couple there all adds up
you should read more about who recommends that "change" interval and stop preaching it like its gospel. That is nothing more than fear mongering... michelin has put in print that their tires can go 10 years. And that info is available on the internet... just like the made up 5yr life span of rv tires.

As for cost... its like $50/tire... x 6 so barely the cost of 1 low end 19.5 tire for the 22.5. There is a dramatic difference in a 19.5 chassis versus a 22.5. Those are facts... not speculation.
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Old 04-14-2013, 06:55 AM   #11
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Quote:
Originally Posted by tuffr2 View Post
The larger tires on a gas chassis typically do not turn as sharp the smaller tires.
really?
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Old 04-14-2013, 07:12 AM   #12
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Puzzled.

Does not make sense to me to go up or down in tire size, unless you are considering getting another rig?
I know I dont have room for an upsize to 22.5.
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Old 04-14-2013, 07:36 AM   #13
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No one has mentioned the increase in unsprung weight with the change to 22.5 from 19.5. Is it not as important as in the much lighter weight passenger car suspensions? Would the weight difference be negated if you went with alloy wheels/22.5s? Hmmmm
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Old 04-14-2013, 07:54 AM   #14
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Quote:
Originally Posted by tomrx1 View Post
...if your coach came with 19.5's your rear end ratio is around 4.30,however,if the coach came equipped with 22.5's originally,the ratio will be much lower such as 5.30....tires and rear end determine the final drive ratio...I would think it would be better to stick with original equiptment size! ...just my .02 !!!....safe travels!
im not to sure that is accurate with F53 chassis. My first motor home had 16" tires with a 5:30 ratio, my current motorhome has 19.5" tires with a 5:30 ratio and a motorhome I just worked on has 22.5" tires with 5:30 gears. That one cruise at a few hundred rpms less than mine at the same speed. I believe the larger chassis 24K and 26K chassis have the 22.5" tires with a 6.13 gear in them.

The 4:30's I think are limited to the E class motorhome.
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