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Old 11-03-2013, 05:21 PM   #1
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19.5 vs 22.5 wheels & tires

I have a 2008 35' Winnebago on a Workhorse Chassis. It has 19.5" wheels & tires. It is my first RV and I really enjoy it. My question is what are the advantages of the 22.5" tires on similar chassis?
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Old 11-03-2013, 05:47 PM   #2
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Quote:
Originally Posted by Flanagan View Post
I have a 2008 35' Winnebago on a Workhorse Chassis. It has 19.5" wheels & tires. It is my first RV and I really enjoy it. My question is what are the advantages of the 22.5" tires on similar chassis?
The Motorhome with 22.5" inch tires has a bigger and stronger chassis frame than the one with 19.5".

I have two commercial trucks. One with 19.5" tires and the 2nd one has 22.5". The tires and wheels are not interchangeable between the two trucks.
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Old 11-03-2013, 08:20 PM   #3
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You may want to get it weighed, in your normal, ready for travel mode. You may be pushing GVWR limits (I'm guessing it is 21,200 lbs.). 22.5 inch tires would have given you a 22K or 24K GVWR. You should add your model name and number in your signature so we can give you more useful information about your MH.

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Old 11-03-2013, 08:22 PM   #4
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I'll take a stab at comparing the two

19.5
  • cheaper to buy
  • easier to store a spare

22.5
  • more expensive to buy
  • difficult to store a spare
  • larger load carry capacity for larger coaches
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Old 11-03-2013, 08:31 PM   #5
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Just a thought, if you were to change it would be expensive. you would have to change the hubs if that is possible on the model you have. Calibrate the speedometer etc. My opinion is that the 22.5's will be more stable and carry more weight. They are more expensive but you get what you pay for.JMHO. Jim
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Old 11-03-2013, 09:03 PM   #6
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Quote:
Originally Posted by Infinityrver View Post
The Motorhome with 22.5" inch tires has a bigger and stronger chassis frame than the one with 19.5".........

The tires and wheels are not interchangeable between the two trucks.
SORRY, but this is simply not true for the W series workhorse chassis.

Regardless of which tire/wheel option,the chassis rails are the same. It is true that the W series chassis are "bigger & stronger" chassis than the P32 chassis that preceded the W, but the W could have either 19.5" OR 22.5" wheels, depending on what the coach builder ordered.

Changing to the 22.5" wheels is generally not feasible because the coach wheel wells and other dimensions were not designed for the larger tires. Ed
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Old 11-03-2013, 11:15 PM   #7
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In theory, the comparison is this:

22.5 have a larger rolling radius than a 19.5. Therefore, they should offer a smoother ride.
22.5 have more surface area than a 19.5, therefore they should have more carrying capacity (load limit).
22.5 will turn fewer revolutions per minute at a given road speed than a 19.5, therefore they should wear at a lower rate and possibly operate at a lower temperature.

IMHO, 22.5 is superior for a motorhome.
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Old 11-03-2013, 11:24 PM   #8
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Also, just changing tires and wheels will not increase the legal carrying capacity of the RV. That can only be done by the complete vehicle manufacturer.
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Old 11-03-2013, 11:57 PM   #9
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Koop, I think you said it best. I have driven many coaches with the smaller wheels and my new bounder has the 22.5's and it rides as smooth as glass. Not sure if it can all be attributed to the wheel size but I would et it accounts for lot of it
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Old 11-04-2013, 02:43 AM   #10
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The contact area of your tire has nothing to do with wheel size. It is the size of the tire you put on a wheel that makes the difference. The 22.5 tires are generally rated for a higher load capacity than 19.5's. That means a stiffer tire. The 22.5 tires will give a harsher ride on a light coach. If you decide you just have to have the 22.5's try to get a load rating as near to the 19.5's as you can get. Then weigh your rig and inflate the tires accordingly. On tire sizes, remember the first number is the width of the tread in mm. The second number represents the profile height as a percentage of the tread width. Third number, wheel size in inches.
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Old 11-04-2013, 03:07 AM   #11
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Thanks for the insight on 19.5 vs 22.5. I wasn't thinking of changing tire size but was curious about what I was missing. My Winnebago Sightseer 35j is my first RV. I didn't know then what I know now about what choices are available.
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