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Old 05-24-2011, 02:05 PM   #1
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Alcoa Alloy wheel Spec?

Was offered a set of Alcoa wheels, but I now know they were not right...
What is the size and width for future reference?
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Old 05-24-2011, 05:40 PM   #2
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The early P-30 is 19.5"x6". The lug bolt circle is 7.25" and the center hole is 5.25" and off set is 5.08". The rear axle has 10 lug nuts and the front has 5 lugs. I'm not sure what the tag uses.

If you run across a set you don't want, I'm looking for some.

Cheers, Dan
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Old 05-24-2011, 08:22 PM   #3
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The Tag should use the same wheel as the drive axle.
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Old 03-14-2013, 03:45 PM   #4
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I know this sounds wacky at first, but finding 19.5" Alloys is too darned hard... yet 22.5's are pretty common.
Now, the 22.5's are not available with our 7.25 PCD...
Anyone ever seen an adaptor?

Oh, and before anyone says it...
A 225/70 R19.5 and a 225/70 R22.5 tire is pretty close on rolling diameter

About 2 revolutions per mile difference.
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Old 03-14-2013, 04:54 PM   #5
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Quote:
Originally Posted by Keyair View Post
I know this sounds wacky at first, but finding 19.5" Alloys is too darned hard... yet 22.5's are pretty common.
Now, the 22.5's are not available with our 7.25 PCD...
Anyone ever seen an adaptor?

Oh, and before anyone says it...
A 225/70 R19.5 and a 225/70 R22.5 tire is pretty close on rolling diameter

About 2 revolutions per mile difference.
Try these guys. Rickson Wheel Manufacturing

This is the spec. and they have them.
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Old 03-14-2013, 07:06 PM   #6
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I think Rickson wheel sold out to another company, that doesn't offer aluminun wheels any longer.
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Old 03-14-2013, 07:13 PM   #7
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I think Rickson wheel sold out to another company, that doesn't offer aluminun wheels any longer.
I don't know about that but the web site is still up.
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Old 03-17-2013, 07:25 AM   #8
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Keyair

You may need to check your math the 22.5 is 3 inches larger. With the same width and aspect ratio that makes the overall diameter 3 more inches. The real problem you will likely run into is Clearence. The 22.5" wheels are also wider than the standard 19.5's. After 3 blowouts in 3 trips I looked at this option but found it would be impossible without major body modifications.
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Old 03-17-2013, 12:00 PM   #9
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Hi Oliver!
Wow, a 370 owner!
Impressive!

I agree width could be an issue, but here are the specs for a 225/70 R19.5 tire and a 225/70 R22.5 tire.
Bob Dickman Tire Center - Motorhome Tires Tires by Size

Both sizes quote a 6 to 6.75" rim width too.
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Old 03-17-2013, 05:01 PM   #10
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Keyair, I thought your 345 all ready had alloy wheels on it? I've been looking for some time and haven't been able to locate any either.
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Old 03-17-2013, 05:07 PM   #11
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Nope, just steelies with chrome covers...

Interesting news is that I called a place friday who say they are tooling up for a steel adaptor for this conversion. They said later this year production will start.
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Old 03-17-2013, 06:07 PM   #12
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I think that may be a mistake. To My knowledge the lowest profile 22.5 is a 255/70r22.5. That tire is @ 37" in diameter the 225/70r19.5 is @ 32". If you do find a 33"-34" 22.5 let me know because I have 10 new 22.5 Alcoas ready to put on.
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