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  1. #1
    Silver Member
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    Jan 2013
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    123
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    Gate City, Va
    Tractor
    YANMAR YM336D

    Default YM2002D Tire size

    I have a YM2002D that has 6x14 tires on the front and 8.3x24 on the rear. Some web sites say it should have 5x14 on the front and others say 6x14. My question is. Can I put 9.5x24 on the rear?
    Thank,s for any reply

  2. #2
    Elite Member
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    Dec 2009
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    3,036
    Location
    gilmer tx
    Tractor
    Bobcat CT235

    Default Re: YM2002D Tire size

    I also have a YM2002d. I can tell you the YM2002d parts manual from Japan shows 8.3-24s on back and 5-14s on front. Hoyes also confirmed that to be correct. I personally think your front to rear ratio is off like you have it. Unsure about what it would be with 9.5-24s and 6-14s. I know the way I use my 4 wheel drive I want the ratio as close to correct as is possible.

  3. #3
    Silver Member
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    Jan 2013
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    Gate City, Va
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    YANMAR YM336D

    Default Re: YM2002D Tire size

    I bought this tractor at Fredricks 9 years ago. It has always had 6x14s on the front. I have noticed that tractors with 6x14 on the front have 9.5x24 on the rear. I just replaced the front tires about 6 mo. ago so when I replace the rears I would realy like use 9.5x24. I have never had any problems with the combination that came on the tractor. Just think the 9.5 would be better proportioned.

  4. #4
    Gold Member
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    Jul 2002
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    North Texas
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    Yanmar

    Default Re: YM2002D Tire size

    The tractor would have came with 5x14 on the front & 8.3-24 on the rear. Since you have 6-14 on the front now you would be fine going with a 9.5-24 on the rear. In fact, it would get you back really close to the original ratio.
    Aaron
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  5. #5
    Veteran Member deepNdirt's Avatar
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    Sep 2009
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    2,298
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    Nth East Ga, USA
    Tractor
    yanmar YM-1700

    Default Re: YM2002D Tire size

    Quote Originally Posted by HoyeTractor View Post
    The tractor would have came with 5x14 on the front & 8.3-24 on the rear. Since you have 6-14 on the front now you would be fine going with a 9.5-24 on the rear. In fact, it would get you back really close to the original ratio.

    This is the way I would see it as well,
    Though not sure of the actual size different in height of a 5" tire verses a 6" due to this size being the width not actually the height, The 14" wheel size remains the same, does anyone know what is the height differences between the two?
    I know the difference on the rear from 8.3 <to> 9.5 in approx 1.5 + 1.5 giving a total of approx 3" in height ,
    the attached photo can provide reference to the difference you see when changing from 8.3 to 9.5
    Attached Thumbnails Attached Thumbnails -img_0621-jpg  
    Never judge a man until you've walked a day in his shoes,

  6. #6
    Elite Member
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    Dec 2009
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    gilmer tx
    Tractor
    Bobcat CT235

    Default Re: YM2002D Tire size

    Research shows me 5-14 72", 8.3-24 117". Using a 1.67 ratio that would give you a 2.769 front lead.

    Research shows me 6-14 77", 9.5-24 123". Using a 1.67 ratio that would give you a 4.544 front lead.

    Both leads are acceptable I believe. I do not know the actual front to rear ratio of a YM2002D. Just using the 1.67 ratio to compare the different tire sizes. I wish I knew the correct ratio.

    I am back again believing the YM2002D has 42 tooth and 26 tooth gears in the drop box which would give you a 1.615 front to rear ratio. If you run the above numbers you will get a -.6153 for the 5-14s and 8.3-24s. You will get a 1.102 for the 6-14s and 9.5-24s. I really think there are a little different circumferences on rice tires verses American R1 tires and also may be a difference from one brand to the other. My conclusion is that the two different sizes should interchange. As everyone here knows this is mostly a bunch of rattling and not much conclusive evidence.

    2nd edit. Back with some more not so scientific information. I put my YM2002D on cement, marked the tires and cement, rolled front and rears 1 revolution, again marked cement. Got 116-1/2" on rear 8.3-24 ricers and 71-7/16" on front 5-14s. My rear ricers do have wear so I would believe they would have originally been 117" or more. My fronts are fairly new but I'm sure have a little wear. For whatever it is worth (not much) that all equates out to a .9686 ratio using the 1.615 formula. I believe that is an acceptable number although I wish I had a plus number.
    Last edited by winston1; 01-30-2013 at 10:19 AM.

  7. #7
    Elite Member Car Doc's Avatar
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    Mar 2009
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    3,246
    Location
    Kansas
    Tractor
    YM3810D Yanmar

    Default Re: YM2002D Tire size

    Sounds like it will work fine to me. I ended up putting 8x16 fronts on mine recently it came with 7x16 however my rears were not oem size and were larger dia. The 8's gave me a +3.45% front to rear bias and it works good I can feel it pull now. Lots better than it was working where the rears were close to pushing the fronts it always felt like it was bucking up. fwtw

    I had a heck of a time Winston getting the oe bridgestone roll out dont remember if I ever did now? I ended up doing my own computations along with the Titan tech man.
    Yanmar YM3810D, LT duty 3pt hoe, 6' KK2 tiller, 6' KK box blade, 6 1/2' KK disc, 5' Howse bush hog, 5' Howse back blade, 9" Yellow PHD, 3 Husky chain saws 346XP NE, 359, 372XP. 07 HD Heritage Softail, Crack injectors, check compression, take 2 beers and call me. "Hey you didn't build that."

  8. #8
    Super Member clemsonfor's Avatar
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    Greenwood Co., SC
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    Yanmar YM2000

    Default Re: YM2002D Tire size

    Quote Originally Posted by R Barger View Post
    I bought this tractor at Fredricks 9 years ago. It has always had 6x14s on the front. I have noticed that tractors with 6x14 on the front have 9.5x24 on the rear. I just replaced the front tires about 6 mo. ago so when I replace the rears I would realy like use 9.5x24. I have never had any problems with the combination that came on the tractor. Just think the 9.5 would be better proportioned.
    What are you doing to wear out all those tires? Loader work on concrete?
    YM2000. MF dirt scoop,4' Jbar bushhog,boompole, LMC 12-16 disk harrow, 4' Atlas boxblade (with rippers). 1980 chevy K10,1990 ford ranger 2wd (285K miles),1997 saturn SL2 (twin cam!!),2001Toyota Higlander
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    Troybuilt 4 cycle & Echo 2 stroke,cold natured(need carb rebuild),MS390 Stihl, Northern tool pressure washer, mixes water into the oil in the pump(now dead, motor on a tiller). 5000 watt generator.

  9. #9
    Super Member kenmac's Avatar
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    The Heart of Dixie
    Tractor
    yanmar 3110D

    Default Re: YM2002D Tire size

    Quote Originally Posted by clemsonfor View Post
    What are you doing to wear out all those tires? Loader work on concrete?
    Probably replacing them because of bad dry rot. Fredricks (at that time) didn,t put new tires on like he does now.

    Mine were replaced last yr
    A Fredricks Yanmar 3110D
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  10. #10
    Silver Member
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    Location
    Gate City, Va
    Tractor
    YANMAR YM336D

    Default Re: YM2002D Tire size

    The tires were the original tires that came on the tractor when it was built in 1981 or 82. the front tires were dry rotted but the rear tires still have good tread on them but showing some age. I don"t need to replace the rears but would like to have the larger size on the tractor. I just bought a Massey 231 tractor but I don"t think I can give up my YM2002D because of the 4WD.

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