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Old 12-04-2018, 07:57 PM   #1
Boxhead
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Default Wheel sizes and offsets

Hi all,

Hoping you can help me a little, i have a heap of rims with tyres ( tyres are wrecked and need replacing) for my 1942 1 1/2 tonne truck. I need to work out what is right to put on the truck so i can get them blasted and painted. I have a couple of questions,

- what sizes should the rims be to suit the truck
- are the front rims usually narrower than rears?
- what offset should the front rims be
- do the rear duals have different offsets or are they the same but outside is put on
Reversed? And what offest should the rear rims be for the duals?

Any help would be appreciated to help me work this out so i get it right.

Cheers

Corey
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Old 12-04-2018, 09:33 PM   #2
GB SISSON
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Default Re: Wheel sizes and offsets

My '47, which is the same as your '42 has 8.25s on all six rims. All rims are the same width so they are all interchangeable. That's how they make dually trucks. More common is 7.50 tires and back in the original trucks they ran them narrower, like 6.00s and 6.50s. I just like big tires and I found a set of four traction tires in an 8.25 on CL for 50 bucks apiece. No brainer. Coker, Miller have most of the sizes with tubes and boots. Just depends , do you want heavy duty or original. They all fit, and we aren't hauling three tons of potatoes over the mountains in August anymore.
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Old 12-04-2018, 09:40 PM   #3
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Default Re: Wheel sizes and offsets

Just a side note. Corky sold coker tire last month. Hope they continue making our specialty tires.

https://www.timesfreepress.com/news/...siness/483105/


Most likely business as usual. Figures crossed
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Old 12-05-2018, 03:43 PM   #4
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Default Re: Wheel sizes and offsets

Before I do a deep dive into part numbers and cross references of Ford numbers to the manufacturer numbers, offset figures, and backset calculations, I would suggest you start by looking for Budd Company part numbers on your wheels. All 1942 trucks will have the same width wheels front and rear. Finding six that match will probably get you home free. The Budd numbers will probably be on the flat surfaces of the concave side center discs. You might also find numbers on the rear rim lips.

The below 1942 chart tells part of the story showing the wheels were either 6” or 7” wide. That cited measurement is based on the Wheel and Rim Association industry standard of the era. Today’s standard would redefine a 6” (measured lip to lip) as a 4.33” (measured across the inner rim base). Similarly a 7” then is today a 5.00”. Once you’ve found Budd numbers please come back and I can give you specs on them. Stu

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Old 12-05-2018, 05:39 PM   #5
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Default Re: Wheel sizes and offsets

Thanks for the replies guys,

I will check out the numbers and post back. Although yesterday i was looking and some have a different offset, i was measuring from the back lip of the rim to the back of the hub from memory some were 40mm difference..

I guess this may be due to different model wheels, i will check the numbers

Again appreciate the help

Cheers

Corey
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Old 12-05-2018, 06:10 PM   #6
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Default Re: Wheel sizes and offsets

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As years went by, the tire sizes and widths increased for heavier loads, the rim widths increased also to accommodate that tire width, since they should not rub together when mounted as duals. The narrower the earlier . But for many years they would interchange on the bolt pattern.
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Old 12-05-2018, 06:15 PM   #7
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Default Re: Wheel sizes and offsets

That measurement you are taking is called “back spacing”, or “backset”. It’s a way to start, but it doesn’t tell you “offset” because it will vary depending rim width of each. The below charts let you do the math.

I also hope your wheels are all still assembled. Keeping rim and ring sets together as matching sets is important. Stu


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Last edited by truckdog62563; 12-05-2018 at 06:27 PM.
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Old 12-06-2018, 03:24 AM   #8
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Default Re: Wheel sizes and offsets

Ok guys i got a few numbers but not all, i have another 5 to try and find the numbers on,

1. Sankey /56
2. Sankey /56
3. 2938
4. 41
5. Looks like C-84860 second line 3 48 (think its 48)
6. 9 47 81T-1015


Does this help at all? I will get to the other 5 rims as soon as i can and post the numbers.

Cheers guys

Corey
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Old 12-06-2018, 05:19 AM   #9
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Default Re: Wheel sizes and offsets

Thanks Stu and Cool33, very helpful
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Old 12-06-2018, 07:11 AM   #10
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Default Re: Wheel sizes and offsets

Let’s go in reverse order.

6. An 81T 1015 with 9/47 build date gets us started. That is the Ford number for an industry grouping T623 wheel. It is a 20” x 4.33” (6” old system). Shown to have 4.5” of offset. I can connect that Ford number to two Budd Company wheels having different outer rims. Ford regrettably lumped such wheels under one part number. The first is Budd 35260 that has a Firestone “RH” style unbroken side ring. The second is Budd 34860 that has a Goodyear “LW” style split type side ring. Both 4.33” wide with 4.5” offset and 7.25” of backset. The rings DO NOT interchange.

The only wheels I’ve had with the Ford number stamped rather than the manufacturer number were produced for Ford of Canada. If I’m reading your dialect correctly I’m guessing you are an Aussie or from SA or NZ, which fits the Ford of Canada manufacture picture.

5. Your 84860 is I think a 34860 as above. Produced 3/48. You might look at it again. If you think it is clearly an “8” then I’ll have to dig into Motor Wheel Corporation references since that would be their numbering pattern.

4. 41 is nothing more that the year of manufacture probably. Kelsey Hayes wheels of the era were not numbered so this one will need to be evaluated based on width and backspacing to calculate offset. Make note too of it’s rim and ring design.

3. The 2938 needs a fifth digit. Rather than me guess what that might be please look at it again. If nothing else is there we’ll again have to go by rim width and backspacing to calculate offset. Note the ring type.

2 and 1. I have no reference for a Sankey wheel. But if these are AU/SA/NZ wheels there could have been some produced locally that I have no references for. Again we’ll have to do them like 4 and 3 above.

Let’s move on to your next batch. Stu
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Last edited by truckdog62563; 12-06-2018 at 10:57 AM.
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Old 12-06-2018, 10:46 AM   #11
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Default Re: Wheel sizes and offsets

While Boxhead gets me some more numbers, I’ll go over some tire sizing issues. Both of the 4.33” wide wheels covered above have 4.50” of “offset”. To mount them together in a DRW mounting would yield 9.0” of “DRW Spacing”. Every year the Tire and Rim Association publishes industry standards showing approved rim/tire combinations. Those 4.33” rims are approved for 6.50-20” tires. A set of 6.50-20s in a dual mounting require 8.30” of DRW spacing. If a guy was to mount a set of 7.00-20” tires it’d work because they require 9.00” of DRW Spacing. A 7.50-20” requires 9.70”, and an 8.25-20” requires 10.6”.

Every industry reference I have says an 8.25-20” needs a 6.50-7.00” wide rim (using the current standards). Except for the Green Bible. It lists a 5.00” (7” old) rim for that tire. I have come across some 5.00” wide wheels that have 5.50” of offset (11” DRW spacing) which give the needed DRW spacing. But I’d sure want to make sure of what I have before trying to mount 8.25s. Stu
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Last edited by truckdog62563; 12-07-2018 at 07:45 AM.
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Old 12-07-2018, 05:07 AM   #12
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Default Re: Wheel sizes and offsets

Thanks Stu,

Appreciate it, your correct im from australia ( queensland actually). I wont get to the other rims until Monday as i will be working until then.

Cheers

Corey
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Old 12-07-2018, 07:39 AM   #13
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Default Re: Wheel sizes and offsets

Okay, I’ll be here. Stu
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Old 12-09-2018, 06:49 PM   #14
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Default Re: Wheel sizes and offsets

Good morning guys,

Ok,

- the sankey wheels i can find no ther numbers
- the wheel with 41 on it has another number on the back C 42920 6 42 no idea why there is a 41 on the other side.
- the 8 is definately a 3 as you suggested stu
- there is no other number with the 2938, these numbers are a lot larger than other stampings. I may need to clean up the other side and see if there is anything.


Additional wheels,

- 4 x 81T-1015 (so same as above)
- BB-1015-D ( not sure)
- 60030 52 ( not sure)

Thanks for everyones help.

Cheers

Corey
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Old 12-09-2018, 08:04 PM   #15
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Default Re: Wheel sizes and offsets

Okay, this is straight forward. You now have six 81T 1015s, so they give you a set. They are 4.33” wide (old 6”) and have 4.5” of offset. The Kelsey Hayes number is 21900.

The BB 1015D is an older wheel. 20” x 3.75” (old 5”) having the Firestone RH design rim/ring. It has 3 7/8” offset. Kelsey Hayes number is 19447.

The Budd 42920 is a 20” x 5” (current measurement system). It has the Firestone RH rim/ring and has 5” of offset.

The Budd 60030 is a 20” x 6” (current measurement system). It has the Goodyear LBW rim/ring design and has 5.50” of offset. Stu
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Old 12-09-2018, 11:45 PM   #16
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Default Re: Wheel sizes and offsets

Thanks Stu,

Appreciate the help, unfortunately looking at one of the 81T rims it seems to be pretty rusted.. so probably not useable. I will measure and look if i am able to use the sankey rims as outside duals maybe.

I will check the offset and rim width etc, can i run slightly different offset rims on the rear? I'm guessing so as long as the tires fit ok.

Cheers

Corey
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Old 12-10-2018, 07:14 AM   #17
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Default Re: Wheel sizes and offsets

Depending on the width and backset of your two Sankeys you have several options. If the Sankeys are close in dimensions to the 81T 1015s you can mount them on the front and dual up four 81T 1015s that have 7.25” of backset on the rear. Their offsets yield 9.00” of DRW spacing which works with the 7.00-20” tires.

I think you might rule out use of the 60030 because of its 6” width and 9” of backset. The 42920 is 5” wide and has 8.25” of backset which might make it too much different than the others too.

The earlier BB 1015D is much narrower, and has only 6.25” of backset. You might be able to run it on a front corner teamed with an 81T 1015 on the other side, but I think you don’t want to try mounting a 7” tire on that narrow wheel. Plus, if it matters, I think you’ll see it has a different appearance than the 81T 1015. The hand holes are more of a triangle than those on the 81T 1015. In the attached FTE thread there are pictures of each that might help. Stu

https://www.ford-trucks.com/forums/1...6-1-5-ton.html
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Old 12-12-2018, 05:43 AM   #18
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Default Re: Wheel sizes and offsets

Thanks Stu,

I will work out a plan for the rims, none of these are the dreaded widowmakers are they? I will also try to have a look when i can get back to them.

Cheers

Corey
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Old 12-12-2018, 06:41 AM   #19
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Default Re: Wheel sizes and offsets

None that I found record of are widow maker Firestone RH-5° style. Yours are mostly the Firestone RH type that has a solid unbroken side ring design. Tricky to service if you’ve not done it. I’ll post pictures below. I’ll have to go back up the page to refresh my recall on your Goodyears. I remember that the 60030 has the LBW split ring that is simple to service. The Sankeys I’d need to see pictures of to tell you what you have. Below are pictures. Please remember that the rim/ring sets should be kept together. The different designs, and even different widths within the same design, don’t interchange.





Here’s a picture of the RH showing the indents on the inner edge of the ring that allows it to squeeze over the lip of the base rim.



Here’s the widow maker RH-5°. Stu

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Old 12-13-2018, 06:45 PM   #20
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Default Re: Wheel sizes and offsets

Thanks Stu,

You have been a great help.

Cheers

Corey
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