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Old 01-07-2007, 09:57 PM   #15
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All, thank you for posting to this thread -- I appreciate the information you have provided.

Ponder: Since several tire manufacturers sell 245 and 265 R 70 19.5 tires, and since said tires require rims wider than 6 inches, it seems to me that out there somewhere is a company that makes a wider 19.5 inch rim.

How would one go about finding that company?

BTW, I already found Alcoa -- but $500.00 per rim is out of my price range.
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Old 01-07-2007, 09:58 PM   #16
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Thanks, Terry. Are P30 chassis front wheels lug centric or hub centric?
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Old 01-08-2007, 07:34 AM   #17
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Quote:
Originally Posted by Taxman
All, thank you for posting to this thread -- I appreciate the information you have provided.

Ponder: Since several tire manufacturers sell 245 and 265 R 70 19.5 tires, and since said tires require rims wider than 6 inches, it seems to me that out there somewhere is a company that makes a wider 19.5 inch rim.

How would one go about finding that company?

BTW, I already found Alcoa -- but $500.00 per rim is out of my price range.
The 19.5" qwheels I told you about are steel, and $75 each. At the Navistar dealer.
I think they are lug-centric, pull off a single lug nut. If it is flat, or has a washer at the base, it is hub-centric, if the nut is beveled on the base, like a wedge, it is lug-centric.
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Old 01-08-2007, 10:55 AM   #18
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Thanks -- off to find a Navistar dealer!
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Old 01-08-2007, 12:48 PM   #19
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My wheel wells come equipped with fuel filters for my diesel, so I guess its skinny tires for me.
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Old 01-08-2007, 03:21 PM   #20
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My wheel wells come equipped with fuel filters for my diesel, so I guess its skinny tires for me.
Why not move the filters? If you put them inside the engine compartment, you will have less trouble with the fuel waxing during winter rallies.
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Old 01-08-2007, 05:59 PM   #21
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Terry,

Thanks for the info -- I have located a local Navistar dealer. He needs to know if my wheels are hub-centric or lug-centric. Also, the Navistar wheels have a 6.4" wheel offset, vs (I believe) a 5" wheel offset for the stock wheels.

I went to the Accuride web site and found what I believe are replacement 6x19.5 steel wheels for the P30. Accuride indicates that the wheels are hub-centric, and shows them installed with a "clamping plate" and 90 degree cone nuts.

Here is my question -- what was the type of MH you installed the Navistar wheels on, and was there a problem with the wheel offset? Did they bolt right on with no problems?

Is my supposition (actually, the info came from the Accuride web site) that the standard P30 front wheel offset is 5" correct?

I'd really like to take advantage of the low profile tires available today, but the cost involved ($150.00 per wheel, BTW) compels me to move slowly and have as much good information available to me as I can before I commit!

Frank
1990 33' LY; Banks; GV; SuperSteer Bell cranks; Roadmaster sway bar kit; Bilsteins.
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Old 01-08-2007, 07:24 PM   #22
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It was a '77 Argosy motor home. 5" was the stock amount, but since you are going wider, you need to take the wider wheel into consideration, so you don't rub brake hoses and upper control arm.
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Old 01-08-2007, 07:55 PM   #23
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Unless I am grossly mistaken, the wheel offset will move the wheel 1.4" toward the center of the coach -- I'd prefer that it move the wheel toward the outside of the coach.

IOW, less wheel offset is a good thing, for my purposes. Actually, with a 7.5" wheel, I'd prefer roughly a 4" offset. 4.25 would be better, if my thinking and calculations are correct, thus evenly splitting the difference in wheel width.

I'll have to get out the old tape measure and carefully measure the wheel wells -- I don't think these wheels will work.
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Old 01-09-2007, 07:35 AM   #24
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Quote:
Originally Posted by overlander63
Why not move the filters? If you put them inside the engine compartment, you will have less trouble with the fuel waxing during winter rallies.
I need access to them when I fill the tank to drain off the water.
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Old 03-02-2007, 10:47 PM   #25
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tires and offsets

Quote:
Originally Posted by Taxman
Unless I am grossly mistaken, the wheel offset will move the wheel 1.4" toward the center of the coach -- I'd prefer that it move the wheel toward the outside of the coach.

IOW, less wheel offset is a good thing, for my purposes. Actually, with a 7.5" wheel, I'd prefer roughly a 4" offset. 4.25 would be better, if my thinking and calculations are correct, thus evenly splitting the difference in wheel width.

I'll have to get out the old tape measure and carefully measure the wheel wells -- I don't think these wheels will work.
If my memory serves me correctly there used to be people who could widen wheels, at least i seem to remember it being done for dune buggies. there may be no one able or willing to do so in today;s litigous world but if there were you could retain the present postive offset while increasing track and tire width. hope that doesn't sound to dumb. i also distinctly remember flipping the rims on a vw bug for the visual effect. sounds kind of dumb now but back then we thought it was cool.
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Old 03-03-2007, 06:52 AM   #26
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Try Alcoa

I believe that I saw 19.5" rims to fit theh P-30 on their web site last time I was there.
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Old 03-03-2007, 08:09 AM   #27
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Make sure

Quote:
Originally Posted by Taxman
Unless I am grossly mistaken, the wheel offset will move the wheel 1.4" toward the center of the coach -- I'd prefer that it move the wheel toward the outside of the coach.

The offset of a wheel is what locates the tire and wheel assembly in relation to the suspension. More specifically, it is the me
asured distance between the hub mounting surface and the center line of the rim. Below is an explanation of the various types of offsets.

Positive Offset
A positive offset occurs when the hub mounting surface is on the street side (the side you see) of the center line of the rim. Most factory rims will have this type of offset.

Zero Offset
When the hub mounting surface is centered within the rim, it is known as a zero offset.

Negative Offset
If the hub mounting surface is on the brake side of the center line of the rim, it is considered a negative offset or "deep dish".

Note that extensive negative offset can potentially cause increased steering wheel kick-back and place additional stresses on the vehicle's entire suspension.

Now, the way I read this, if you got a wheel with 4.25' positive offset, you would only be getting a total 4.5 wider front,(assuming the present offset is 5"" all the while achieving more tire patch contact.
If you had a 3.5" positive offset, you then would have 6" wider from outside to outside, yet still have the tires mostly inside the mounting centerline to keep the stress on your components as low as possible.
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Old 03-03-2007, 02:57 PM   #28
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wider tire

I went to Firestone Transforce HT LT 275 x 175 x R16 on the front and after 5k miles, I'm happy.
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