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Farmall & IHC Tractors Discussion Forum
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1950 M-15.5x38 or 16.9x38 rears-what;s best ?

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Walter in Ky

09-19-2006 12:31:53




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Need to replace rear tires on 1950 M. Tractor has 15 inch wide wheels (spoke not dish)from a 656, with flat top 656 fenders. Have old, mismatched 15.5's, should I replace with 15.5, or use 16.9's? I think the 15 inch wide wheel will carry the 16.9's, but need opinion about replacement size and tire brand. Firestone 23 degree F&R?

Tractor not used much, rake hay, pull wagon, Sunday Drives, pulling days over. Always been partial to bigger tires. All advice appreciated. Walter in Ky

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Duke Denning

09-23-2006 18:30:01




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
I personally like the 14.9-38s on an M that's "healthy"....if it's just a "standard" the 13.6's would probably be a better choice. Most new 400's came with 13-38's although some of the last ones had the 15.5's like the 450's came with. It took some getting used to to overlook how small the diameter was on the 15.5's compaired to the 13-38's. 16.9's are too much tire for all but the most powerful M types....bearing troubles could happen too with those big skins. Nice on a healthy 560 though....

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BOBM25

09-20-2006 09:01:07




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
Check pricing. When I checked around here a while ago a 15.5 was about 100 less per tire than a 14.9. I imagine its cause you don't see alot of 14.9 rears on newer tractors



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dej(JED)

09-20-2006 05:23:30




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
16.9 x 38 tires are the same height as 14.9 x 38's. I have been running 16.9's on my M for the last 10 years and they perform well. I have little if any power loss, especially since I have the low 1st gear for hard pulling.



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the tractor vet

09-19-2006 16:56:18




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
Been there done that and after doing that i should have listened to my inner self . I put 16.9x38' on my S/MTA to go play but that littel voice inside ketp telling me to go with the 14.9's . They will set ya up a bit higher give better traction then the 15.5 give a bit more speed and you won't feel like you are sliding out of the seat on level ground like the 16.9' do . and if ya already have a 14-15 inch rim your in business.

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Hugh MacKay

09-19-2006 16:03:46




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
Walter: CNKS is correct, from 13.6 through to 15.5 there is little diameter change. You will find 16.6 are a big change, noticably increase your speeds and cut power. Great for flotation or clearence in hay windrows.

I did this with 560D and 656D, I did notice the significant increase in speed. The 282 diesel handled the power issue quite well. I will admit the flotation and clearence was great. When I went to 16.9, I didn't refill with chloride, and found the 16.9 gave better traction in a field situation than 15.5 with chloride. On hard ground or roadways the 15.5 with chloride will do better. My tractors rarely ever pulled loads on roads or highways.

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CNKS

09-19-2006 13:01:49




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
I wouldn't go past 13.6's. But if you like the way bigger tires look, do as you please. My understanding is that 15.5's are the same diameter as 13.6's (I can be corrected), so if you go to 16.9's you increase diameter resulting in faster ground speeds and reducd power. For what you are using it for it doesn't matter.



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sde

09-19-2006 13:56:00




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to CNKS, 09-19-2006 13:01:49  
CNKS- I have been told by a retired tire man that the 15.5 is a lower profile 14.9. That the tube and rim will fit the same. Question. I have a parts tractor with a very good 13.6 on it. I was thinking today that if I put 13.6s on the 400 that the tire chains might actual fit better. Is there a noticable lost of traction or floatation by going down one size?
SDE



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CNKS

09-19-2006 17:57:12




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to sde, 09-19-2006 13:56:00  
I am not sure what the "standard" tire was on a 400, I imagine that a 13.6 would be the smallest one. 15.5's although popular, are sort of an oddball as they have no even-inch equivalent. I can't answer your question as I have had no experience with a 400. But, whether you notice any difference depends on its use. I would think that a 14.9 would be a better all-around performer than a 13.6 on that size tractor, though. In snow the chains are going to make more difference than tire size.

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Janicholson

09-19-2006 12:35:21




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 Re: 1950 M-15.5x38 or 16.9x38 rears-what;s best ? in reply to Walter in Ky, 09-19-2006 12:31:53  
Fat tires are cool, but they can make transport difficult. The 15s are already bigger than the original options. JimN



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