08-15-2021, 11:09 AM | #1 |
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20 inch rims
I got 20" duals on 46 3 ton. Can 8.25 tire go on where 7.5 was? I assume its just a width diff. 6" rim. Are these able to balance?
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08-15-2021, 11:29 AM | #2 |
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Re: 20 inch rims
8.25 will fit, you will actually go faster! also your speedometer will be off just little
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08-15-2021, 02:14 PM | #3 |
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Re: 20 inch rims
I find getting these balanced a real bugger
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08-15-2021, 02:17 PM | #4 |
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Re: 20 inch rims
The 1941-48 Service Bulletins shows 7.50 and 8.25 on 7" rims.
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08-15-2021, 04:48 PM | #5 |
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Re: 20 inch rims
That is one very neat old 1941 Ford Truck with Patina. |
08-15-2021, 08:42 PM | #6 |
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Re: 20 inch rims
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08-15-2021, 09:26 PM | #7 |
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Re: 20 inch rims
The '47 two ton had wider rims so I went to 8.25s. The '37 ton and a half is on 7.50 x 20s. I'm a tire guy, I vote for the 8.25s. The extra circumference is a big plus on modern roads
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) Last edited by GB SISSON; 08-15-2021 at 09:32 PM. |
08-15-2021, 09:30 PM | #8 |
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Re: 20 inch rims
And I just found another pic of the '47. I love the 8.25s
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
08-15-2021, 09:31 PM | #9 |
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Re: 20 inch rims
Watch out for sidewall rubbing on your duals with larger tires. Some stock rims do not have the spacing for the wider widths. Newc
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08-16-2021, 01:26 AM | #10 |
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Re: 20 inch rims
good advise ^^^^, can not let the sidewalls touch, makes heat, go boom. I just retired from a construction company, 5 axle dump trucks, semi's to haul equipment, never balanced any truck tires. seems wrong to me, but 30 years of drivin them...I guess it works
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08-16-2021, 08:11 PM | #11 |
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Re: 20 inch rims
Before giving an answer to this question, we need to know how the 6 width measurement is determined. Are you measuring across the rim lips, or down inside between rim lips. It matters. The National Wheel and Rim Association (NWRA) measurement standard used during the 1930s, and carried on by Ford in the Green Bible, was to measure across rim lips. In the 1940s the NWRA changed their standards to record measurements down inside across the inner base rim. Thus an early 6 rim is today called a 4.33 rim, and an old 7 rim is today a 5.00 rim. The Green Bible is the only reference I have that cites an 8.25-20 tire as appropriate for what is a current 5.00 rim. Most references cite it for a current 6.00 or wider rim. Never on a 4.33 rim. Stu
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08-16-2021, 09:30 PM | #12 |
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Re: 20 inch rims
I would follow the road Stu has paved for you. He knows this subject like no other.
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08-16-2021, 09:55 PM | #13 |
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Re: 20 inch rims
The size I gave in post #4 are the old numbers. The Service Bulletins shows
tire size 8.25x20 wheel size 5.00-S (20x7) . |
08-17-2021, 02:25 AM | #14 | |
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Re: 20 inch rims
Quote:
Thanks Owen. Stu
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08-17-2021, 09:26 AM | #15 |
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Re: 20 inch rims
A '40 1 1/2 ton I used to have had 8.25's on the front and they rubbed the fenders when turning. Replaced them with 19.5's before I sold it.
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