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38s vs 34s
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Bob C IL View Drop Down
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Joined: 25 Sep 2009
Location: Paris IL
Points: 369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bob C IL Quote  Post ReplyReply Direct Link To This Post Topic: 38s vs 34s
    Posted: 18 Jan 2016 at 7:27pm
Anyone off hand know the circumference difference between a 18.4x38 vs 18.4x34?
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den/southern illinoi View Drop Down
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Joined: 11 Sep 2009
Location: Sparta, Illinoi
Points: 2060 		Post Options Post Options   Thanks (0) Thanks(0)   Quote den/southern illinoi Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2016 at 8:39pm
Since I do not know the actual diameter of the two tires, I cannot figure the difference.  At the outside of the rim it is 12.56 inches difference.  You take the diameter times (multiply) by 3.14.  At least I think that is what my math teacher taught me.  Den

Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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Bob C IL View Drop Down
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Joined: 25 Sep 2009
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Points: 369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bob C IL Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2016 at 8:55pm
I can do the 38s but no 34s available for scientific research!!
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ILGLEANER View Drop Down
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Joined: 13 Sep 2009
Location: Willow Hill,ILL
Points: 6448 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ILGLEANER Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2016 at 9:53pm
Bob are you thinking 34s to change your gear ratio to the ground ?????
   IG
Education doesn't make you smart, it makes you educated.
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patrickmull View Drop Down
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Joined: 11 Jan 2011
Location: Casey IL
Points: 893 		Post Options Post Options   Thanks (0) Thanks(0)   Quote patrickmull Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2016 at 1:22am
setting side by side 18.4 x 34 on 20" wheels firestone f/r are the same height as my 15.5 x 38 f/r on 16" wheels 

Edited by patrickmull - 19 Jan 2016 at 1:25am
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bradley6874 View Drop Down
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Joined: 05 Sep 2010
Location: salisbury md
Points: 1349 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bradley6874 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2016 at 11:44am
What bradn tire if there fireston google firestone tire data ar callthe dealer they can tell ya I walked in and started asking quetions he got tired of looking stuff up and gave me an old catoulg and said take it find what you want just leave ealone   
You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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O.P.S. Heads View Drop Down
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Joined: 02 Jan 2013
Location: Iowa
Points: 574 		Post Options Post Options   Thanks (0) Thanks(0)   Quote O.P.S. Heads Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2016 at 12:39pm
How about if you look at speed charts for the same tractor at the same RPM. One speed chart with 34's and the other with 38's. Figure the percentage difference of speed and use that.

Or use these:

http://commercial.firestone.com/content/dam/bcs-sites/firestone/PDF/RCI.pdf

http://www.petestirestore.com/184x34-Firestone-Super-All-Traction-II-Tractor-Tire-8-Ply-TL_p_7149.html
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Bob C IL View Drop Down
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Joined: 25 Sep 2009
Location: Paris IL
Points: 369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bob C IL Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2016 at 1:52pm
Thanks for the advice guys! all I needed was a measurement last night. My son and a buddy borrowed a calculator and think we have it figured out. My sons best idea was to buy a red or green tractor cause they have all the fancy store bought parts. Well that won't work with my situation because of a 8 to 5 job, wife, and rasing a granddaughter. And no farm ground to sell ( shouldna said that ). Oh well if all else fails it's one impressive lawn chair to drink beer out of. Later!
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