Confused about rear tire size.

I need to order some new rear tires for my 850 and my 2n. The 850 has 13.6-28s and the 2n has 12.4-28s. They look to be about the same size. If I get 4 of the same size it's discounted. WOuld that work? I guess I don't understand the difference between the 13.6 and the 12.4

Same brand tires? I've noticed that tractor
tires can run a little odd in size,
especially foreign tires. Your standard
brand tires will have the actual sizes on
line for you to use to pick your new tires.

The first number is the width of the tire, the last one is the diameter if the rim or wheel. Yes you could put the same tire on both tractors. I would put the 13's on them both not enough difference in width to matter and the height will be in significant also.
There will be some who would adhere to the exact size for purity issues, or worry warting. You are only talking about an inch difference in the width. They may or may not have the same width rims. In the last 70years anything could have been changed on it.

pull your tractors up side by side. that will show you the difference in height which is what your are talking about. 28 width are the same. just height will be different. also remember different size in height will make a difference in ground speed. a 13 inch tire will go faster than a 12 inch tire at the same motor revolutions. don't know how much but it will. to your answer I think either will work.

tire sizes are a nightmare of manufacturers internal choices. The chart I include has one manufacturers data. The difference between the two izes from
different producers can nearly overlap. It also depends in the aspect ratio. and that is also a played with number. Simple way to think of aspect
ratio is to look at a 2018 car with those wheels and tires that are mostly wheel with tiny little rubber stretched around them. compared to a front
tractor tire from a B John Deere, that has a real sidewall but narrow. Width to height of section. A tire is looked at as though it is cut in half,
and only one cut looked at.

The section height to section width is this ratio. a 70 series (ratio) tire is 70% as tall in section as wide in section.
Because tractor tires do not often have series number, there is substantial questioning of mounted and pressurized size.
Unloaded total standing height is also given for some tires. This is total height when mounted and inflated. Just buy what you want in pairs. Jim
size chart.

The N Series should have 11.2x28 and an
800 should have 13.6x28. At least that
is how they came from the factory.

Most folks in these parts run either 11.2x28 or 12.4x28 on their N Fords,
and there are lots of them still around. Several of my neighbors have them.

11.2 is a smaller tire than a 12.4. However,differeing brands can be larger or smaller than a competeing brand. Plus,an older tire can stretch some,makeing it look bigger. Each tractor can accept 11.2 13 to 13.6 tires.However,11.2 is a bit small for your 850. 13.6 is a bit big for an 8N. Go ahead and order 4 12.4 tires.Everything will be just fine and you be happy.

The 13.6 has more flotation as it is both an inch wider and taller in section of tire but total 2 inches taller total installed. So that difference will make a difference in speed and power to ground as more speed translates to less pulling power. If you are using your tractor on soft surfaces then the 13.6, if you are wanting a slow speed for say a finniching mower then the 12.4. The 13.6 will give you a faster road speed but you could not pull as much of a load. So is it a working tractor or a play tractor and what kind of work or what kind of play would it be doing. That could make the difference in what you could use. Just a tractor drive tractor the 13.6, for pulling a disk then the 12.4 as you would be shorter on power with the 13.6. I have a 44 2N that came new on 10x28 that is now 11.2x28. In 46 it was fitted with new tires of 11x28 that is now a 12.4x28 because we needed more traction for plowing and disking, but a 13.6 would have cut power too much for that but have given more traction. Is the 850 a Ford or a John Deere? The 850 Ford is a 44 PTO horsepower tractor with a 5 speed transmission but no live PTO and easily would in most contitions handle a 3-14" plow while the 2N is a 23 PTO horsepower tractor and a 2-12" plow size so the 850 needs a bigger tire to handle the load. 850 Deere is a compact that I actually know nothing about. So it comes down to what you plan on doing with your tractors. The 850 ford came new with a 2" wider and 2" taller sidewal tire than the 2N. With the 13.6 tire you would be going with a 1" wider and 1" taller sidewall tire than the 12.4 tire. So it should come down to what you want to do with the 2N. For work I would look for a 12.4 tire, just for tractor drive probably the 13'6 tire due to more road speed. But if you have the Sherman over drive or over and under drive you would not want the extra speed from the 13'6 tire.

The worst thing you can do to a N is put 13.6 on it, it will kill the pulling power they are already fast so you will make it faster : (... I don't like 12.4 on them either its the same deal it kills it for my use.

On the N you need some tire slippage to keep the RPM's up when doing ground engagement work take the slippage away and it will bog down : (...

The 850 will take on about all comers its powered up well all you have to do is feed it : (... If you had to compromise I agree 12.4 on both... 12.4 on the 850 would be easier on the clutch :wink:

If it were my money 11.2 on the N : ) let the little fellow dig its way out instead of die on its way out...

(quoted from post at 10:49:08 01/05/20) The worst thing you can do to a N is put 13.6 on it, it will kill the pulling power they are already fast so you will make it faster : (... I don't like 12.4 on them either its the same deal it kills it for my use.

On the N you need some tire slippage to keep the RPM's up when doing ground engagement work take the slippage away and it will bog down : (...

The 850 will take on about all comers its powered up well all you have to do is feed it : (... If you had to compromise I agree 12.4 on both... 12.4 on the 850 would be easier on the clutch :wink:

If it were my money 11.2 on the N : ) let the little fellow dig its way out instead of die on its way out...

Click to expand...

agree with Hobo.. The n does not have enough hp and is already too fast to be very useful. You will simply make it even worse and less usable. Sometimes saving a penny can cost you a lot of money.. .in this case, the value of the N.

Which tractor will you use the most? I would get the tires best suited for your primary tractor.

So the 2n is just a fun tractor that the kids like. I pull them around with a wagon. It s not used for anything. The 850 I pull logs out of the woods and brush hog with. Also mow pastures from time to time. I think I ll just get the 13.6 for the 850 and 12.4 for the 2n.

Price 13 the 850. then go price 11 for the 8N. Maybe the two different(one bigger,one smaller) may balance with 4 12.4s. My 8N has 12.4. they are too big IMHO,but work. The next set (coming very soon) will be 11.2. 'My' Jubilee has 12.4,the 900 has 13.6.

Are the Carlisle tires okay for the n and 850? Looking at the csl24 s

Carlyle are good. I just bought 2 for the front of my 8N. American made,too.

12.4 and 13.6, even 14.X are listed in my shop manual for my 2000 and 3000. I put on 13.6x28 :stamped on a 12" rim and they have been doing just fine
with no difference I could tell on either tractor's performance. Had I been row cropping I would have opted for the 12.4s.

One thing that is confusing, is that I have 13.6x28s on my 3910 without the rim width marking and they look to be much larger than the ones listed above.
Haven't put the ruler to it but it is puzzling.

If anybody knows the answer to the riddle I mentioned I would surely be interested and thank you for your time.