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JD 50 rear wheel size

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OTGuy

01-08-2002 17:25:18




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I was just planning on ordering some new rubber for my 1953 50 and I noticed that the tires seem to be different sizes. The one on my left is a 12.4-38 on an 11" 11-38 rim and the one on the right is a 13.6-38 on a 12" 12-38 rim (according to the markings on the tires). Are the tires maked incorrectly, or do I in fact have two different rim sizes? Should I get rims the same size?
Thanks.




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G Taylor

01-08-2002 19:46:19




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 Re: JD 50 rear wheel size in reply to OTGuy, 01-08-2002 17:25:18  
Unless used for pulling a 10" rim needs a 11.2x38 tire, 11" rim should use a 12.4x38 tire & a 12" rim should wear a 13.6x38 tire. The origional tires were 10-38 (11.2x38),11-38(12.4x38),9-42(?) or 11-42(12.4x42). Couldn't find the diameter for the 12.4x42 tire but ground speed must be way faster than the 11.2x38 that's only 47" tall & 142" around.



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Denny Frisk

01-09-2002 06:47:32




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 Re: Re: JD 50 rear wheel size in reply to G Taylor , 01-08-2002 19:46:19  
Firestone's Web Site Ag tire info directory says the 12.4 X 42's casing is 11.6" wide on a 9" wide rim, 63.1" over all dia., 29.8" loaded radius, and 191" rolling circumference.



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The Dukester

01-08-2002 19:10:19




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 Re: JD 50 rear wheel size in reply to OTGuy, 01-08-2002 17:25:18  
The tires you have are different sizes, but the rims are probably the same size. Either size that you have will work on your tractor, but I believe the 12.4-38 is the normal size and the 13.6-38 is one size oversize.



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OTGuy

01-09-2002 07:58:37




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 Re: Re: JD 50 rear wheel size in reply to The Dukester, 01-08-2002 19:10:19  
Thanks. I'll measure the rims and see what happens. I appreciate the fast responses!



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---===] jer [===---

01-08-2002 19:00:39




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 Re: JD 50 rear wheel size in reply to OTGuy, 01-08-2002 17:25:18  
OTGuy, measure across the fatness of the tires, and measure across the wide part of the rims. There is a chance that they are the same, since there has been two changes in names of tires, while the actual sizes remained the same. A man who worked at Goodyear I think) wrote an article on the subject in Farm Collector Magazine. The tires could be the same. Do they actually measure different sizes? Overall height and "balloon fatness?" Finally, ask the person who sells tractor tires what sizes are meant to be used on a 50. He should know.
Hope this helps. ---===] jer [===---

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OTGuy

01-09-2002 08:01:34




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 Re: Re: JD 50 rear wheel size in reply to ---===] jer [===---, 01-08-2002 19:00:39  
I appreciate your response, and will follow your advice. You are right, it is probably best to talk to the tire people. Thanks for your help.



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Ron

01-09-2002 05:59:03




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 Re: Re: JD 50 rear wheel size in reply to ---===] jer [===---, 01-08-2002 19:00:39  
Unless you are a "purist", and want to compete in restoration events, I would put the larger tires on it.. You will have better floatation, and much better balance of power to traction... My 520 has 13.6x38" and is a MUCH better size, compared to my 1952 "B" w/ 12.4x38" A friend put 11.2x38" on his IH-"H", and it is VERY short on traction, and leaves deep tracks in soft ground.



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another ron

01-09-2002 08:22:18




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 Re: Re: Re: JD 50 rear wheel size in reply to Ron, 01-09-2002 05:59:03  
11.2-38 is definitely too small for an "H" Farmall
They should have 12.4-38 to be equivalent to what the "standard" size was that most came from the factory with. 12.4-38 with proper ballast (fliud and/or weights) will be good traction.

The JD 50 also needs 12.4-38 to be equivalent to factory issue size.



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Denny Frisk

01-09-2002 12:59:56




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 Re: Re: Re: Re: JD 50 rear wheel size in reply to another ron, 01-09-2002 08:22:18  
Dad had a '39 Farmall H that had 10 (11.2) x 38's... Just thankfull it wasn't 10 X 36's!!! 11X38's (12.4X38's) are a better compromise but I think 13.6's (12 X 38's) are too big for a 50 JD or H Farmall.... Used to work for a guy that had a tired old 520.... hour meter broke at 7000 hrs.... had Firestone 12.4 X 38's... Planted A LOT of corn with that tractor..4-38's in corn and 6-30's in beans.

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OTGuy

01-09-2002 08:05:00




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 Re: Re: Re: JD 50 rear wheel size in reply to Ron, 01-09-2002 05:59:03  
Thanks. I think I will go with the higher floatation tires. I appreciate the response.



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G Taylor

01-09-2002 13:21:50




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 Re: Re: Re: Re: JD 50 rear wheel size in reply to OTGuy, 01-09-2002 08:05:00  
If this is a working tractor Michelin makes a 12.4x38 radial & up. Firestone has 13.6x38's & up. psi in the tire equals psi on the ground, not tire size. Bias are limited to 12psi & radials can go down to 6psi. Load capacity cannot be exceeded with either type of tire of course.



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