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Charlie175 View Drop Down
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Joined: 11 Sep 2009
Location: Shenandoah, VA
Points: 6369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Charlie175 Quote  Post ReplyReply Direct Link To This Post Topic: Footprint
    Posted: 24 Mar 2016 at 9:27am
OK, some places limit tire footprint (Say 170 sq inches)

A 13.6x38 is 168 sq in while a 14.9x28 is 170 sq in. 
Seemly equal but why does the 38 seem to pull better?
Charlie

'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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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: 24 Mar 2016 at 11:58am
Charlie the way I see it the shorter tire digs deeper so your climing of of a wide deep whole instad of a long narrow shallow whole with less taper.
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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allispuller View Drop Down
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Joined: 12 Nov 2012
Location: illinois
Points: 194 		Post Options Post Options   Thanks (0) Thanks(0)   Quote allispuller Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2016 at 12:23pm
Ground speed plays a big role in that with the same gear ratio a 13.6x38 will speed the tractor up so there for you are getting the bars to the ground faster
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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: 24 Mar 2016 at 2:00pm
ground speed is most of it I can pull farther  in the 4000 open than I can in the 4000 4 mph
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cwhit View Drop Down
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Joined: 12 Sep 2009
Location: Sigel IL
Points: 997 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cwhit Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2016 at 5:30pm
I don't remember the footprint # but when we used 16.9-28s we could pull in the 5500lbs class and spin out. When we put on the 15.5 38s, it would kill it.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2016 at 8:56pm
16.9 x 28 tire has a 175 sq inch footprint and a 56 inch diameter.   15.5 x 38 tire is 180 sq inches and 61 inches in diameter.   If you were traveling 3.5 MPH with the 28 inch tires, the same gear selection would have you traveling at 3.8 MPH with 38 inch rubber.
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