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John Deere Tractors Discussion Forum
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BLinWMi

03-24-2007 07:29:32




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Skip is correct, these are 2 different measurements for the same tire from 2 different time periods. Similiar with tractors that listed 13x38s, the same actual tire today is 15.5x38. 12x38 are 14.9x38. same tire just different way manufacturer measures them today.




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massey333

03-24-2007 13:51:58




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 Re: agree in reply to BLinWMi, 03-24-2007 07:29:32  
Try again,11-38=12.4-38,12-38=13.6-38,13-38=14.9-38,15.5-38s was a new size in 1958 or so.No offince meant but needed to be corrected.A 14.9-38 is a bigger tire then a 15.5-38.



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BLinWMi

03-24-2007 16:16:13




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 ? in reply to massey333, 03-24-2007 13:51:58  
I had a list of current tire sizes and the old case sizes that they represented and have went from my list. guess it doesn't surprise me the list is off. But not sure how a 14.9x38 is a bigger tire than a 15.5x38.



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johndear

03-25-2007 07:16:01




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 Re: ? in reply to BLinWMi, 03-24-2007 16:16:13  
Look at Firestones chart, a 14.9 - 38 is closer to a 16.9 -38 and is larger than a 15.5. The 15.5 is a "low profile" tire and a 14.9 is a taller tire, therefore, more rubber on the ground. That is what makes it a "bigger" tire.



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Mike Aylward

03-24-2007 16:25:38




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 Re: ? in reply to BLinWMi, 03-24-2007 16:16:13  
A 14.9-38 is a TALLER tire than a 15.5, but has a narrower tread width. The 14.9 puts a slightly larger footprint on the ground due to it"s larger diameter/circumference. Mike



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fixerupper

03-24-2007 10:58:32




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 Re: agree in reply to BLinWMi, 03-24-2007 07:29:32  
When was the change made? These tires have been on the tractor since 1966 or maybe before that. Jim



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JMS/MN

03-24-2007 11:03:07




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 Re: agree in reply to fixerupper, 03-24-2007 10:58:32  
Old size marking went to new size marking about 50 years ago.



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fixerupper

03-24-2007 17:58:51




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 Re: agree in reply to JMS/MN, 03-24-2007 11:03:07  
For some reason I had it in my head that the size change was sometime in the sixties. Shows how little I know about this. Thanks for setting me straight. When I got this tractor it had fluid in the rears plus three weights per side which would put it's weight at about 9500 pounds. Quite a lot of weight for a 50 horse tractor. It came from North Dakota where the soil is fairly loose so it probably needed the traction. I got rid of the fluid and here in Iowa it still has enough traction to pull the front end up when it's pulling 4-14's. Jim

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