2305 john deere tires
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LBrown59
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You can't mix R4 with turf tires.
megotatractor
Veteran Member
You can't mix tires on any 4wd.
My dealer ,two of them ,said it can be done with no problem , but then I heard it cant be done??? I want to use the same size thats on it now but change to turf , and leave the two r-4 rears .Why cant you mix the tires??
jenkinsph
Super Star Member
If you can measure the circumference(spelling) of the tires and they are the same you can do it. Close is not good enough, the problem is the 4x4 drivetrain is set up for specific ratios front to rear and putting the wrong tires on can cause expensive repairs. You really need to use matching sets of tires on your tractor.
What is the problem with the existng front tires and what are you trying to accomplish?
Steve
What is the problem with the existng front tires and what are you trying to accomplish?
Steve
AKfish
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Must be summer...?? Thinkin' of dirt and grass and new shoes for the tractor! 
Here's a thread that points out the inherent problem of mixing tire sizes/types with 4x4 drivelines, etc.
http://www.tractorbynet.com/forums/john-deere-owning-operating/99612-tire-slrs-mfwd.html
AKfish
Here's a thread that points out the inherent problem of mixing tire sizes/types with 4x4 drivelines, etc.http://www.tractorbynet.com/forums/john-deere-owning-operating/99612-tire-slrs-mfwd.html
AKfish
thendricks
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Agree with the above, you cant mix tires unless they have exactly the same circumference. You would be putting stress on the driveline all the time.
If circumference has to be exact what happens as the tires wear? I'm sure the ratio of front/rear circumference doesn't stay exact throughout the life of the tires. How about when the fronts wear out and you replace with the same type/size but don't replace the rears because they haven't worn? At this point, the rears HAVE worn some so the original circumference ratio is not the same. I would think that as long as you keep the circumference close to the original, you should be able to change to turfs if you would like.
unit40
Silver Member
Good point about the wear issue. I have replaced the front turf tires on my 1070 twice, never had to change the rears. That being said, some general rules apply no matter what tires or combination of tires you have on your tractor, such as Never operate on dry pavement in 4WD. Maybe get an extra set of front rims with turfs on them for the summer if you are worried about scuffing.
AKfish
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That's correct.. there's only a few "absolutes" in life and tractors!
There's a range of tolerances for the differences in diameter between the front tires and rear tires. And it's 0.5% to 6.0%. See the link if you really want to know what that means...Best of luck.
AKfish
jenkinsph
Super Star Member
Maybe I shouldn't have said EXACT okay, but I am not going to suggest to someone that close is good enough and then have them come back on this forum and complain that the advise given cost them a front differential or whatever.
Steve
Steve
AKfish
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Not intending to step on anybody's tires, here.. er, toes.
Cautious advice is clearly the best direction.
But, any action taken is certainly up to the individual. As well; the personal responsibility to be thoroughly informed before committing to a course of action.
AKfish
Cautious advice is clearly the best direction.
But, any action taken is certainly up to the individual. As well; the personal responsibility to be thoroughly informed before committing to a course of action.
AKfish
JD3520Turbo
Silver Member
Okay,
There is a thing called lead and lag. What these terms refer to, is the front tire's relation to the rear. If the fronts cover more ground to one revolution of the back tires, then you have a lead. If the opposite is true, you have a lag. On a MFWD type tractor, the prefered is to have a lead of about 0 to 2%. The main reason is that you have better performance if the fronts are pulling ahead all the time. If you have a lag, you are pushing the front tires with the rear, and that sort of kills the benifit of having 4wd.
There is absolutely no reason you can't run a turf tire on the front and an R-4 on the back. The key is staying in that 0 to 2.5% lead. The industry accepts a 2.5% lag as well, but I believe the optimum to be in the lead side of zero.
One key piece of info is knowing what the ratio is from the front to back. That will tell you what you need to know. I have a 3520 and I know that the ratio between the rear and the front is 1.623. So that means that for every one rev of the rear axle, the front turns 1.623 times. I got this info from JD's tech people online. Took a week for them to get back to me, but they did.
The other thing you need to do is know the Overall Diameter of the R-4 tire you are taking off, and compare it to the turf tire that you are wanting. If you can find two the same, then you in business. If you can't, then that is where the fun begins. Trying to find some rear tires that will match up to your fronts.
I will use my 3520 as an example: The front tire is a 27X8.50X15. So, it is 26.8 inches in OD. If I take that X 1.623, I get 43.49
That tells me that I need a rear tire at or a little smaller than that figure. The rear tire is a 43X16X20 and it is actually 42.6 in OD, so I have a lead, of2.1 %, meaning the front tires are traveling 2.1% further than the rear tires are in one revolution of the rear tires.
To answer a point brought up earlier. The reason you have a 5% (+or - 2.5%) window is to take into account tire wear. The fronts will wear about two to one over the rears depending on how much you run the it in 4wd. So as the tire wears down, you give up a little lead.
So it is doable, but the issue is finding a tire that will give you the OD you are looking for to keep your lead that you need.
I hope that made sense. It is late and I am tired.
Good Luck.
There is a thing called lead and lag. What these terms refer to, is the front tire's relation to the rear. If the fronts cover more ground to one revolution of the back tires, then you have a lead. If the opposite is true, you have a lag. On a MFWD type tractor, the prefered is to have a lead of about 0 to 2%. The main reason is that you have better performance if the fronts are pulling ahead all the time. If you have a lag, you are pushing the front tires with the rear, and that sort of kills the benifit of having 4wd.
There is absolutely no reason you can't run a turf tire on the front and an R-4 on the back. The key is staying in that 0 to 2.5% lead. The industry accepts a 2.5% lag as well, but I believe the optimum to be in the lead side of zero.
One key piece of info is knowing what the ratio is from the front to back. That will tell you what you need to know. I have a 3520 and I know that the ratio between the rear and the front is 1.623. So that means that for every one rev of the rear axle, the front turns 1.623 times. I got this info from JD's tech people online. Took a week for them to get back to me, but they did.
The other thing you need to do is know the Overall Diameter of the R-4 tire you are taking off, and compare it to the turf tire that you are wanting. If you can find two the same, then you in business. If you can't, then that is where the fun begins. Trying to find some rear tires that will match up to your fronts.
I will use my 3520 as an example: The front tire is a 27X8.50X15. So, it is 26.8 inches in OD. If I take that X 1.623, I get 43.49
That tells me that I need a rear tire at or a little smaller than that figure. The rear tire is a 43X16X20 and it is actually 42.6 in OD, so I have a lead, of2.1 %, meaning the front tires are traveling 2.1% further than the rear tires are in one revolution of the rear tires.
To answer a point brought up earlier. The reason you have a 5% (+or - 2.5%) window is to take into account tire wear. The fronts will wear about two to one over the rears depending on how much you run the it in 4wd. So as the tire wears down, you give up a little lead.
So it is doable, but the issue is finding a tire that will give you the OD you are looking for to keep your lead that you need.
I hope that made sense. It is late and I am tired.
Good Luck.
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