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38" rubber on d-17?

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nickia View Drop Down
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Joined: 11 Sep 2009
Location: alden iowa
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nickia Quote  Post ReplyReply Direct Link To This Post Topic: 38" rubber on d-17?
    Posted: 21 Nov 2020 at 9:10pm
how much faster of a road speed will you get with 38's vers 28"?  I used my brothers 560 the other day and i was amazed how fast it went down the road will a 17 with 38" wheels come close to the speed of a 560?  Wanting to haul manure with it need to shorten travel time

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Calvin Schmidt View Drop Down
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Joined: 11 Sep 2009
Location: Ontario Can.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Calvin Schmidt Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2020 at 6:48am
I have 14.9 x 38 on my D-17 IV diesel. It moves along nicely but I never checked the actual speed. 
Nothing is impossible if it is properly financed
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allisorange View Drop Down
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Joined: 27 Mar 2010
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Post Options Post Options   Thanks (0) Thanks(0)   Quote allisorange Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2020 at 7:00am
I do not think you will be as fast as a 560.
They have a fast road gear.

John C
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Joe(TX) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe(TX) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2020 at 7:56am
You did not say which size 28's you have. It would be about 30% faster with 14.9 38 vs 16.9 28. The 560 is geared for 38 in. tires, the D17 is not. You would loose that much pulling power also. In my opinion it would be difficult to handle.
1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2020 at 12:24pm
A D-17 at 2,000 RPM with 16.9 x 28 rear tires that measure 56 inches tall (26.5 inch loaded radius) and no weight on them will travel 15.0 MPH according to the owners manual. The tallest 38's are 14.9 x 38 which measure 63 inches tall no weight on them. This would calculate to 16.8 MPH at the same 2,000 engine RPM. A pair of 15.5 x 38's are a little bit shorter at 61 inches and would yield 16.3 MPH. If you give that D-17 an extra 100 RPM (easy to do) the 16.8 MPH becomes 17.6 MPH and 16.3 MPH becomes 17.1 MPH.  Those Farmall's are FAST and if they get an extra 100 RPM or so, they go even faster !!!!
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nickia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nickia Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2020 at 8:11pm
Thank you Dr if im only going to gain 2mph at the most i'll just stay with what i have

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IBWD MIke View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 23 Nov 2020 at 8:11am
One other thing about the 560, gas at least. Rated rpm's were 1800. It is very easy to bump that to 2400 or 2600. This coming from a retired IH mechanic friend of mine.
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DanD View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DanD Quote  Post ReplyReply Direct Link To This Post Posted: 24 Nov 2020 at 3:05pm
My dad's uncle and cousin lived next door to us.  Where our D17s would pull a bale wagon full of hay up a hill in high gear their H and M Farmalls almost couldn't pull themselves up the same hill. 


Edited by DanD - 24 Nov 2020 at 3:07pm
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DaveKamp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 24 Nov 2020 at 8:40pm
I had an uncle and cousin like that once... LOL


   Oh, you were talkin' about the TRACTOR???

Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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