12.4 tires on a M

PaulGinMn

Member
I just finished restoring a 39 M and new it had 12-36 tires I believe. Im not sure I want to go back to 36" rubber on it. I was wondering would 12.4 firestones on 10" rims look alright on it? Paul
 
It would be more period appropriate for a '39 M to have 12.4s than 13.6s. With that, I like 13.6 or even 14.9s before pizza cutters. I would also stick with the 36" rubber. My mom (who has worked at a living history museum) has pounded period appropriate into my head.
 
12.4's, old size 11 are a little small for an M. The original 12's, new size 13.6 were more common. On the F series narrow rims were more common. IH got closer to the correct rim/tire size on the letter series, but never did get it right, as they often recommended a rim 1 inch less than the width of the tire, ie 12 inch tread on an 11 inch rim. The tires fit best when the tread width is the same as the rim. With the new designation, 13.6 tires fit best on 12 inch rims.
 
The only problem with 36" rims on an M is they'd be OLD split rims, pretty dangerous to deal with.
 
Since you used the word restore and it is a 39 I would stick with the 36. Gonna cost a little more but its a first year of production tractor, might as well finish it right. My 39 F-20 has the 36 inch split rims, the danger of a tire with 15 psi on a split rim is grossly exaggerated in my opinion. The danger with split rims is when you are inflating the tire after mounting, inflate it with the ring down if you are worried about it. A clamp on air chuck with a hose with a shut off also gets you back out of the way just in case it would come off.
 

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