John Deere 4100 tire switch from turf to R4: John Deere Review  -- John Deere Tractors Discussion Forum and Review John Deere 4100 tire switch from turf to R4: John Deere Review -- John Deere Tractors Discussion Forum

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 10-19-2006, 06:43 Post: 136056
amckenas



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 John Deere 4100 tire switch from turf to R4

I have a 4100 with turf tires that I want to convert to R4 tires. I am having trouble finding where the correct size tires/rims is documented. Currently I have R4 tires with 16.5 rims for the rear that I bought on Ebay which I think are correct but what should go in the front?






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 10-19-2006, 08:19 Post: 136064
hardwood

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 John Deere 4100 tire switch from turf to R4

If your tractor is a front wheel assist then you must maintain the correct sizes between front and rear to keep your drive ratio correct between the front and rear to avoid driveling bind up or possible damage. I think the normAL what they call "LEAD SPEED" of the front axle is 2 or 3 percent greater than the rear. Without the front wheel lead or with a slight rear wheel lead you will have a tractor that wanders and is didfficult to steer while using the front wheel assist. Your most likely source of the correct tire sizes would be from a JD dealer or perhaps a farm tire shop may have a chart to help you out. Best of luck. Frank.






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 10-19-2006, 08:57 Post: 136065
DRankin



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 John Deere 4100 tire switch from turf to R4

If you tell me exactly what size tires you have on those 16.5 rims, I can tell you which R-4 front to use.






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 10-20-2006, 05:44 Post: 136116
hardwood

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 John Deere 4100 tire switch from turf to R4

Something I thought of after I posted yesterday. For some reason the same size tires in different brands are hardly ever identical in dimension, so it likely would work out better to use the same brand on both the front and rears. Frank.






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 10-20-2006, 06:38 Post: 136118
amckenas



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 John Deere 4100 tire switch from turf to R4

The R4 rear tires I purchased on Ebay were Carlisle brand size 12/16.5NHS. My local dealer decided the old front tires would work but putting R4 tires on the front would be much better. The R4 front tire size apparently should be 23/8.50x12 although I still haven't seen it in writing anyplace! I found an on-line dealer with a good price for R4 Carlisle tires for the front: http://mgrassroots.com/index.html $63 each for 6-ply plus $21 shipping. Hopefully the tire combination will work ok.






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 10-20-2006, 10:29 Post: 136133
DRankin



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 John Deere 4100 tire switch from turf to R4

Do you have the owners manual? It should list the right tire combos. If not, I can send you a PDF.

My tests have shown the front/rear drive ratio on my 4100 Gear was 1.5 to 1

The same test on my 4115 HST showed 1.53 to 1

What does that mean? It means the front wheels.....in 4wd..... are turning 1.5 times every time the rear wheels turn once. Or you could say that the rear wheels only turn 66 percent of one turn for every complete revolution of a front tire.

Your R-4 rear tires are probably about 103 inches around. So 103 x .66 = 68 inches around for a front tire. This is the "zero lead" diameter or minimum size.

Your tractor is supposed to have a 0 to 5 percent lead on the front axle, meaning it should turn slightly faster than the rear axle.

68 inches x 1.05 = 71.4 inches. So if your rears tape out at 103 inches, any front tire that tapes from 66 to 71 inches would work OK.






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 11-13-2007, 02:54 Post: 148167
scooterdp



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 John Deere 4100 tire switch from turf to R4

All a quick question. I own a JD 4100 and am looking to change out the turf tires... retarded tires if you want to use the tractor for ranching. If I swap to the thinner tires, am I also going to need to replace the rims. I spoke the the Deere dealer here and they said that I would probably need new rims. So, I was looking a fairly large chunk of change to switch to the better tires.

I was wanting to run Ag tires. Agricultural (AG) tires are the traditional tractor tires. The AG tire is tall and narrow with deep cleats, designed for maximum traction; pulling plows in a field, working in the woods and operating in muddy conditions. These tires can damage a lawn or field.

Thanks for any help.

Eric






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 11-13-2007, 08:04 Post: 148171
hardwood

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 John Deere 4100 tire switch from turf to R4

Scooterdp; Yes you are most likely to need rims and all. Most any farm tire repair shop has access to new rims that can sometimes be less costly than thru a Deere dealer. You likely would have to paint them tho. Another option if time is not pushing is to contact some Deere outlets that are in a very urban setting where most CUT's are sold with turf tires, he may have a used tractor with R-4's that he may be wiling to swap tires, rins and all. Good luck. Frank.






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 11-13-2007, 09:10 Post: 148176
DRankin



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 John Deere 4100 tire switch from turf to R4

You should be able to locate a set of 16 inch aftermarket rear wheels fairly easily as they are pretty much standard in terms of bolt pattern and offset.

The front rims will have to come from Deere or from a parted-out older grey market Yanmar. They are very narrow between the beads and carry a metric bolt pattern.






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 11-13-2007, 09:14 Post: 148178
DRankin



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 John Deere 4100 tire switch from turf to R4

Or.......you could go with these Bad Boys.

I am thinking that your turfs are on 15 inch rims???






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