Need Help with Tire Size Options for Ford 850

JB93

Member
Standard tires on my 850 are 13.6-28. Would 12.4-28 be adequate for a working tractor and not create any implement issues? I am looking for used tires, so would be good to have a couple of options. Slightly smaller seems better than larger...in terms of keeping center of gravity lower for safety operating at angles. Yea??
 
You could put 12.4's on it, ground speed would be slower.
Might lose a little traction as well.
For a worker, unless I needed the slower ground speed, I would
stick with the original size. I also wouldn't mix the sizes for long.
Run both sides at the same size or as close as possible.
 

If I had the chance I would opt for 14.9x28"

Not hard to find.

I have a pretty worn set of 13.6x28" on Duals for my WD-45 that are too small for that use...I am in Central Ohio..

If you are interested, I would make you an attractive deal for those tires..!
 
As per he 601/801 owners manual the option for tires where 10-28 which is now the 11.2X28 and the 11-28 which is now the 12.4X28 and the 12-28 which is not the 13.6X28. It also lists the 13-24 and 14-24 as options
 
BushogPapa - I searched for a long time to find used 14.9x28's
in my neck of the woods and couldn't find them. The tire dealer
told me they are now used for steering tires on a lot of tractors
so when they get them in they're too worn out to bother with.
That, of course, is the smaller farmers who are still running
tube type tires on the front end instead of radials.

I ended up having to buy a new one. Odd size and not cheap!
But I like the way they fit my 960 so I'm sticking with them.

43572.jpg
 
One size smaller isn't bad - 12.4x28.
The book calls for 13.6s on my 3000 but I
run 12.4s. I like the lower profile for
mowing under limbs, etc.
I did run 11.2s on it for a short while
but they were definately too small. They
looked goofy and would dig themselves
right into the ground in an instant and
have you sitting on the drawbar if you
weren't quick on the clutch. I do like my
tires to look right on the tractor so
14.9s would be too tall. And you would
likely have to move them out to clear your
fenders too. On a 900 the 14.9s look ok
but not on the 800s.
 
(quoted from post at 03:45:02 12/26/16) One size smaller isn't bad - 12.4x28.
On a 900 the 14.9s look ok but not on the 800s.

I disagree. I like the looks of a 14.9 on my early 4000 all purpose (essentially the same as the 800) a whole lot better than a 13.6.
 
I read prefer and like a lot in the other responses.

If you want 12.4's and can find them, put them on. They should be way cheaper than the 14.9's you didn't ask about, and will fit the rims you
have 13.6's on now. They are perfectly acceptable for an 850.
 
And so it goes.
I've always liked Steely Dan, Bachmann
Turner Overdrive, Dire Straights and CCW.
But I've always thought Bruce Springsteen
sucked big time even though I know he's
sold a lot of albums.
 

I have new 14.9 X 28 on an 861D and 16.9 X 28 on a 4000D SOS. Both work great. They're both toy tractors so looks are paramount. The
4000D SOS with 16.9s and a little extra RPM on the Roosa Master makes it a fun tractor for tractor rides. Surprises some!
 
(quoted from post at 07:27:01 12/26/16) Standard tires on my 850 are 13.6-28. Would 12.4-28 be adequate for a working tractor and not create any implement issues? I am looking for used tires, so would be good to have a couple of options. Slightly smaller seems better than larger...in terms of keeping center of gravity lower for safety operating at angles. Yea??

I am not a fat tire lubber BUT a 850 has the power to handle about any tire you throw on it. Unlike a lower HP tractor are a tired engine you can over tire them bog it down stall the engine and defeat what available power you have.

You have the options to Taylor tires to your needs not what you think looks the best. If you run across a deal on 12.4's they will work.
 
Earlier I posted regarding a PTO that did not hold while on dyno. Here's what I found. Cable linkage to cover OK. Internal linkage to feathering
valve OK. 3 gauges attached to diagnostic ports all read 180 psi in their respective gears, however when pulling out PTO T handle they
dropped to 150 psi. Had to be leakage in the PTO circuit. Split tractor (again) and removed PTO shaft cover. Cover that has small pipe with O
ring. Found seal on PTO shaft was missing. Wthout seal, oil from feathering valve was going back to reservoir rather than engaging clutch
pack, through the hollow shaft. . Seal was a pricey SOB. Now trans light goes off-on- off through travel of T handle. Have not dynoed it but sure
it is OK. It's been quite a learning experience for one that had never been around a SOS prior to buying this basket case in a cardboard box.
Regarding tire size. Bigger is better, just ask your girlfriend. She might even supply the little blue pills.
 

There is a special place in hell for the engineer that came up with the shift and PTO cable adjustment procedure. :)
 
Used tractor tires are impossible to find where I live. I buy new
center pivot tires. They are much cheaper than tractor tires.
 
(quoted from post at 16:00:51 12/26/16)
There is a special place in hell for the engineer that came up with the shift and PTO cable adjustment procedure. :)

I don't think it's so tough . . .and if hell was based on goodness or badness every last one of us would be in deep trouble!
 

Dad's 850 had 13.6 tires, back in the day we did a lot of plowing and discing, even with fluid filled tires it was easy to over power the tires. It would also over power the tires with a grader box full of dirt or rock.
I'd stay with the 13.6 or step up to 14.9's if your going to do any pulling with the draw bar.
Widening out the wheels a notch will give better center of gravity than a shorter tire will.

My 881 had a new set of 14.9's on it when I bought it, they fill the rims well and the tractor looks good with the larger tires, wish we'd had 14.9's on dad's old tractor.
 
(quoted from post at 06:34:45 12/26/16)
Here's the looks of 16.9 X28. Fun little tractor. Finally got the PTO to work properly, Larry.
a246350.jpg
Nice looking tractor. Tires loog great. What color blue is on your tractor? Thanks Matt
 

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