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Old 02-17-2015, 02:25 PM   #1
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1977 20' Argosy 20
Charleston , West Virginia
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Switching Argosy 20' MH to 16" rims?

Any suggestions/advice on switching the P-30 chassis rims to 16"?

The 16" tires are less expensive and more readily available.

(The standard rim for the Argosy 20 is 16.5")

Fred H.
1977 Argosy 20' Motorhome
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Old 02-17-2015, 02:45 PM   #2
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
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The people who have the GMC motorhomes built from '73 to '78 have an Alcoa wheel which they recommend to make that 16.5 to 16" conversion, but I have no idea if it will fit the P30 chassis of the Airstream.

I made the conversion on my own GMC motorhome and it worked well, but the details are fuzzy in my mind as it was sold maybe 10 years ago.

You might join the GMC motorhome forum and ask the question there, someone could tell you I am sure.

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Old 02-17-2015, 04:17 PM   #3
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1975 20' Argosy 20
Chestfield , Kent
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I have the 16" rims on my 20ft (with the 8 x 6.5" bolt pattern), they were on it when I got it but appear to be a straight swap.

However I am considering going up to 17" as the 16" truck tires are getting harder to find (GMC switched to 17" with the same bolt pattern and used that size up to around 2004/5).

The 19.5" rims on my 28ft donor, also has the same bolt pattern so I plan to give them a try (at least see if they fit), my thinking being they will actual in crease the tire diameter by 20%, increasing the drive ratio.
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Old 02-17-2015, 05:12 PM   #4
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Martin, those 8r19.5 tires are getting a bit hard to find in certain brands. Just a heads up. Especially when trying to get a set with date stamps under a year old.
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Old 02-17-2015, 05:30 PM   #5
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Understood mayco, and I wouldn't bother apart from the fact I have the rims to try.

I think the 17" are the way forward (because they were used for so long on so many trucks) but it means investing in a set of wheels and tires just to try, and I have been searching local Craigslist sites looking for a used set but so far nothing has come up.
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