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Farrell(Utah) 
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Joined: 11 Sep 2009
Location: Springville, Ut
Points: 517
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 Topic: Which Tires?
Posted: 20 Dec 2019 at 5:46pm |
In our tractor club, I pull a WD with a WD45 engine in it. Generally, I pull at 4000 pounds and 4500 pounds. In both classes it has lots of power left at the end of the pull and is spinning tires at part throttle. It always does very well in both classes. Here is my question. The tractor has 14.9X28 tires on it and I have some 13.6X38 tires that I can put on it. The tread is excellent on both sets of tires. Which would you think will give me better performance? Thanks.
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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030
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frnkeore
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Joined: 07 May 2019
Location: Southern Oregon
Points: 362
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Posted: 20 Dec 2019 at 6:45pm |
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It sounds to like they will have a very similar foot print but, I think more important, will be the construction and angle of the tread bars.
Beyond that, the 38s will gear you higher and reduce torque at your pulling speed.
Testing will be the best way to tell.
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Frank
1959 D17 Series I #24001+, '59 D14
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70 and 5 more.
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Sugarmaker
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Joined: 12 Jul 2013
Location: Albion PA
Points: 8290
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Posted: 20 Dec 2019 at 7:59pm |
Farrell, I will be watching as you learn and or test too. Not many places local to me allow 38's on our WD series units. But we sure run against a lot of them on other brands and they seem to do real well! So I am going to probably go with a new set of 14.9-28's Crop Max. (Firestone look alike) on the WZ. Couple things your didnt say. What brand or bar type the 14.9's were? As mentioned that can make a difference. Also the track conditions here very from very good power clay tracks to very dry hard dusty stone screeching tracks. I know for sure that these Crop Max type get way better bite on the clay tracks. They can still have the power at the end but may bring the front up before it gets there too. There are so many factors with weight balancing being important too. My guess is that if your pulling in 4500 you have the balance thing figured out. I would like to try these tractors at 5000 lb. but there are so many tractors in those classes it might be tough to end in the center position of the class? I would like to test a set of 16.9-28's on a WD with a strong engine too!:) Just for fun! I have a set of Armstrong's on the D17. Could happen if I got to feeling real foxy this summer. It would be a Farm stock class with no tire limits. There could be out gunned by a stroked engine in a red M!
As the song goes: its all about Faster horses Younger Women Older Whiskey and More Money!!!
Good luck with your tires and your pulls! We need some pictures too! Regards, Chris
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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Farrell(Utah)
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Joined: 11 Sep 2009
Location: Springville, Ut
Points: 517
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Posted: 20 Dec 2019 at 8:47pm |
The 14.9x28 tires are the 23 degree lug design. The 13.6x38 tires have a curvy design that starts at 23 and ends at about 45 degrees. It seems too me that wide tires will often float on our tracks without biting into the track. I have always thought that other things equal that a taller tire has more traction. The hot-rod WCs always seem to have 38 inch tires. But again, maybe it is not an advantage. Nearly forgot, I think the tractor has enough guts to handle the 38 inch tires. It sure is a spunky tractor.
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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4742
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Posted: 21 Dec 2019 at 5:55am |
Short fat tires don't pull??? Watch this: This was the final pull in the class, the flagger was standing at the longest distance at the point when the pull started, pulled much further than anyone else [TUBE]Gt6FyDApako[/TUBE]
The key to tires for tractor pulling is to match traction to available HP in the gear you want to run. There's no one tire that will work for all scenarios. When running Grampa gear classes find something tall enough, that will give you the fastest ground speed you can go and short enough you don't run out of power at the end. To find what works best , you may try many different tires. To run 38" tires on a WC you'll need more than a stock motor and a slower gear than standard low to stay under 3.5MPH. Just because someone else has 38" tires on, doesn't mean you can't beat him with shorter tires. Tractor pulling is a contest of man and machine and how well they can work together, not a ride in the park. Steering wheel holders rarely win. Learning how to get the most with what you have and consistency are key.
Edited by PaulB - 21 Dec 2019 at 6:00am
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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mike a
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Joined: 12 Dec 2009
Location: MN
Points: 165
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Posted: 21 Dec 2019 at 12:59pm |
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switching to 38 is like running one gear faster,but more traction will be found,it worked on my wc that way,best of luck!
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dawntreader74
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Joined: 28 Oct 2013
Location: Manteno
Points: 1770
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Posted: 26 Dec 2019 at 10:37pm |
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best to stay with the 28; tires' if you don;t have 400 cub's . big wheels need big motors..
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