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Will The Size Of Tire Matter On A 4X4 Tractor?

K

KCTractors

Member
Location
Central Wi
Friend of mine has a Ford 1720 4 wheel drive tractor. He had new rear Ag tires put on the tractor and has 215-65- 14
turf tires on the front. He had turf tires on the rear previously. The new Ag tires are about 2 lower than the old
tires. Just about 8 less in circumference. He wants to know if it will hurt anything in the front axle if he runs the
tractor like that?
 
In 2 wheel drive will be fine. In 4wd on loose ground mite be ok but not on pavement. Front runs little faster, thats what helps in keeping from not getting stuck as easy.
 
The reason for the right size front tires on a mfwd tractor is so the gears arent fighting each other and binding between the front axle And rear axle and transmission
 
8 inch less is probably to much. It will always be under pressure when engaged. I find on my tractor with the correct tires but new in back old worn in front I have to back up to take it out of 4X4 gently. if I just flip the switch while driving there is a loud clunk. so I always stop switch and back up
 
I would stay with the original tire size. The engineers supposedly specified a correct tire size for the 4WD setup. Deviating from that could lead to driveline and tire wear problems.
 
Here is what tractordata says for tire size.

4WD Standard tires (ag): Front: 7-14. Rear: 11.2-24
Lawn/turf front 25x8.50-14
Lawn/turf rear: 13.6x16
 
Front wheels are geared to run faster than the rears. Wrong tire size throws the ratio off, can lead to drive line issues and difficulty with steering and disengagement.
 
Would you run one size tire on one side if your 2WD vehicle, and a different size tire on the other side??? On the drive axle??
It's worse than that, on a 4WD when it comes to front and back. Because, it puts the rest of your drivetrain in a bind. Not just your differential.
 
It matters a great deal, but you can change the tire size as long as you keep the 'overall ratio' the same as the original. Math required but not hard. Gear ratio, tire circumference of both axles individually and then divide them to get the proportion. Do the same for the new tires on the back and use the proportion already calculated to give you the circumference you need to put on the front.
 
(quoted from post at 17:36:20 02/14/22) Friend of mine has a Ford 1720 4 wheel drive tractor. He had new rear Ag tires put on the tractor and has 215-65- 14
turf tires on the front. He had turf tires on the rear previously. The new Ag tires are about 2 lower than the old
tires. Just about 8 less in circumference. He wants to know if it will hurt anything in the front axle if he runs the
tractor like that?
Click to expand...

This can't be a serious question.






This post was edited by Carlmac 369 on 02/15/2022 at 07:49 am.
 


Super 99 has it right. The fronts need to turn sightly faster. You won't notice a problem until you get into soft ground and need to turn. If the front wheels are going slower than the rears it won't turn, it will just plow straight ahead.
 
Always use the same brand of tire front and rear if you keep the correct size. Different brands will have different size diameter in the same size. Mark.
 
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