4WD Tire sizes: John Deere Review  -- John Deere Tractors Discussion Forum and Review 4WD Tire sizes: John Deere Review -- John Deere Tractors Discussion Forum

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 09-12-2006, 21:13 Post: 135138
JasonR



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 4WD Tire sizes

I've got a 4110 HST that I recently let my neighbor borrow to do some clearing behind his house. While using it, one of the from tires got sliced and he was kind enough to put a new tire on it.

Getting to the point - the new tire isn't made by the same manufacturer (as the other front tire), but is the correct tire size, ply, ratings, etc. While I don't have a ton of wear on my other front tire - this tire is noticably taller than the other - let's say by 1" - 2" in diameter. From reading other posts - it appears as though incorrect tire sizing (specifically front - back ratio's) can do some damage to the 4WD.

Should I be running out and replacing this tire, or is this within the normal tolerances of the 4WD system?

Thanks, Jason






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 09-12-2006, 22:43 Post: 135139
DRankin



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 4WD Tire sizes

I think that is a problem.....

An inch or two larger on a tire that is 60 inches or so around is a significant difference when you are trying to achieve a "lead" of 0 to 5 percent.

I can direct you to some web info that allows you to test to see if the front to rear ratio falls within the recommended range, but two different size tires would really complicate things.

Are we talking R-1's, R-4's or turfs?






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 09-13-2006, 08:01 Post: 135142
kthompson



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 4WD Tire sizes

Jason,

Have you check to see if air pressure is the same and have you checked the tires on such as concrete with a tape and not just trusting your eye sight?

I know sitting on the ground and eye sighting for my larger tires is not accurate.






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 09-13-2006, 08:18 Post: 135143
JasonR



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 4WD Tire sizes

I've got turfs. They are both 23x8.5-12NHS.

The old one is about 21.75" dia and the new one is 22.75" dia. (On level concrete, proper air pressure.)

- Jason






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 09-13-2006, 09:29 Post: 135147
Art White



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 4WD Tire sizes

We run into this all the time. An inch is not good on that diameter.






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 09-13-2006, 09:34 Post: 135148
DRankin



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 4WD Tire sizes

They need to match.

The 41xx series has a front to rear drive line differential of about 1.49:1

Your front tires should "lead" or turn faster than the rears by no more that 5 percent.

So your 21.75 tire is probably about 68.5 inches in circumference and would match with a rear tire that would range between 97 and 102 inches.

The 22.75 tire is about 71.5 inches around and would match with a rear tire that taped between 101 and 106.5 inches.

As you can see there is a very narrow range (101 to 102 inches) where either front tire would fit a given rear tire.

Hope this is not too convouluted......






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 09-13-2006, 18:36 Post: 135172
earthwrks

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 4WD Tire sizes

I agree that you need to run whatever size the manual says. Otherwise you'll get driveline bind-up, and all that built-up binding has to go somehwere whether it's slipping in dirt or scuffing on hard pack or pavement. If my 33hp blue gets a slightly low tire I can hear it before I see it on pavement. A really low tire will cause driveline groaning sounds.






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 09-14-2006, 00:08 Post: 135180
JasonR



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 4WD Tire sizes

Thanks for the info. guys. I'll have to check my rears as see about where I should be. Right now, I'm only using 4WD when needed, so the conditions are such that a lot of slip is occuring. I'm avoiding driving from point A to B in 4WD.

But first things first... We got 5 inches of rain in about 2 hours this morning - which followed 2" of rain a couple of days ago that completely saturated the ground. End result = 9.5" of water in my building/office. Sad thing is I recently marked some low spots in my berm protecting the builiding, and hadn't gotten to them yet - and that's where the water came in.

I got it all pumped out in a few hours and the clean-up is going better than anticipated. I never thought I would be moving FEL buckets of water with my 4110, but it came in handy today. I'll have to post some pics later on.

- Jason






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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