Go BottomJD 855 4X4 - REPLACE AG TIRES WITH R4 S
 | kpatrick
Join Date: Jul 2003 Posts: 2 Walterville, Oregon 
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2002-12-03 45685
I would like to replace the AG tires with R4's on my JD 855 4X4 tractor.
Has anyone done this with this model and would you recommend it?
What's the best way to go about this? I understand turf wheels can be used for the R4's. Is this correct? It seems that if I can find a used set of turf wheels then I only need to figure out what size R4's will work.
How do you determine what size tires are correct?
Thank you for any help. I'm very green...
Kevin P. McElwee
Walterville, Oregon
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2002-12-03 45688
What size are your present tires? ....
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| kpatrick
Join Date: Jul 2003 Posts: 2 Walterville, Oregon
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2002-12-03 45689
Mark,
I'll check the spec's. this evening... they're currently the stock bar-tread tires and wheels.
Regards,
Kevin ....
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 | Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2002-12-03 45692
I have turfs on the front and R4 on the rear of my 955. From the book I think it is the same tractor with greater HP. I believe that they are the same rims for the stock tires. I certainly don't have any windup with my set up. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2002-12-04 45712
I think the conversion is common enough that a dealer would be aware of R4 tire sets that would work. A do it yourself conversion might cost less. After-market tires and wheels might knock the price down.
The size issue is that tractor front and rear drive trains have different final drive gear ratios to accommodate different sized front and rear tires. To keep the tires laying the same amount of rubber on the ground, the front and rear tire rolling circumferences have to be in proportion to the front and rear drive ratio.
To solve it exactly, the drive ratio must be known as well as the percent front axle lead spec and the rolling circumference of the front or back tires. An ideal rolling circumference for the other tire can be calculated. Some tire manufacturers include rolling circumferences along with the tire data. It can be approximated by pi times the outside diameter. However, like Peters comment, the issue isn't so critical that just 'eyeballing' a tire would likely give a decent match most times. Juggling tire pressures around also will fix a range of mismatch problems. Asking a dealer would be good insurance though.
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