Depends on what weight class. The heavier you go, the more horse it takes. Sled, track, chain length, etc...are also factors. Not a one size fits all answer.
 

Your tire size gives a pretty close idea of weight class, and I don't pull very close to that. but I am interested in what people think. Just to maybe get the ball rolling I will make a WAG of 120.
 
Locally we have that tire size on
tractors as low as 3500#. Some also
use 18.4x38 in the light classes.
Generally a six mph class will be one
of the "modified stock " type classes.
Local promoters allow full cut 18.4x38
in all ppof the 4 mph and up classes.
 
I would think about 125 minimum. But keep in mind there are tractors with 200 pulling in the 3.5 mph farm stock. But if I get it together I'm going to try it with 150.
 
150 plus with big cubes and a great driver with awesome tires,not many tractors,drivers or combination can maintain 6 mph on a limit.
 
I forgot to add that gearing on many tractors will be wrong,just by luck the gearing might be close to six at the required rpm.
 
Some may be missing the point of MPH classes. MPH. classes allow any gear, any rpm (up to the allowable maximum, of course) for driver to regulate and maintain speed. This allows ALL tractors, regardless of make, model or gearing : to be competitive. Prevents "high dollar " tractors from running away with high speed while allowing more "budget" units an equal chance. Speed limit classes are the ultimate equaliser.
 
I guess some don't get it,my facts state the obvious,many tractors don't have the power to maintain speed,the correct gearing for the speed,power to weight ratio,tires and ect.high $ tractors still dominate.it does make it "MORE" equal,but not much.The slower the set speed the more equal it seems to be.Driving a tractor with choices,skill and selection makes it fun,piloting a rocket ship is fun too,but kind of boring after while.
 
Here you go again. I remember you don't understand facts either when they are presented (MH 44 tub weight). Why the moderators keep allowing you to post is a mystery as members would increase 3 fold if you were to leave.
 
(quoted from post at 07:02:49 03/27/16) Some may be missing the point of MPH classes. MPH. classes allow any gear, any rpm (up to the allowable maximum, of course) for driver to regulate and maintain speed. This allows ALL tractors, regardless of make, model or gearing : to be competitive. Prevents "high dollar " tractors from running away with high speed while allowing more "budget" units an equal chance. Speed limit classes are the ultimate equaliser.

Yeah in your and a lot of others' dreams. On a hard track where the close to stock tractor is just about choking at the speed limit as the load from the sled comes on, and does choke ten feet further, the high dollar 2x HP tractor goes merrily past the same point and fifty feet further. The only real equalizer is a soft track.
 
no; I don't get it; From my experience in pulling the last 30 plus years; using mph is the most equal pulling technique. HOWEVER: their needs to be multiple classed so nearly ANY tractor has a chance, and a class they can fit into. Locally we offer 3, 4, 6, 8, and 12 mph classes in weight divisions from 3500# to 8500#. The "secret"; know your tractor, what it will do, pull it within it's ability, and you are able to compete. I do not have nearly as much money in my ride as some I pull against; but; I do win or place quite often. It is all in pulling in a class where you can compete. I have stated before: speed limit is the ultimate equalizer. There is nothing fair about a J.D. "B" running .75 mph trying to compete with a WC Allis running 3.5. Running "low gear only"; that is what happens. I do like to run where they have no speed limits but say "low gear" or Second gear; simply because my tractor is geared high. When using a speed limit; it becomes more of who is the best driver than who spent the most money. just sayin.................
 
not many pulls have that many choices on speed limits,there all you do is pull against yourself with only one or two per class.Too many classes are no good,not enough the same,it works well most or the time,I like to go up against "bigger" engines.Driving it correctly is the fun or frustrating part.
 
535353m : clearly we agree to disagree. I still maintain that mph classes offer the fairest, most equal competition. I would rather pull in a class with 2-4 tractors that I can compete with than be in a class of 20 and know before I signed up I have no chance of finishing above last place. Many times: drivers will get together and decide wher they can pull, have decent size classes AND not be "blown out " HAVE A NICE DAY.
 
If you figure on getting last place,why go !!!!!!!!!!! A positive attitude is far better than a defeatist loser negative view point.I pull all over with several different tractors,I beat guys like you all the time.LOL I mostly always have a "NICE ",DAY,IT'S A CHOICE.
 
My point exactly! !! If there are no rules that make an equal playing field, I stay home. Of course, if the rules allow me an advantage with my high gearing, I definitely try to attend. Few tractors have a low gear as fast as mine.
 
you are arguing facts that yourself admits to using to your advantage!!!!!!!! please read my list of reasons why speed limits do not level the playing field for all tractors like you state.you blow your own reasoning to argue out of the water.
 
I am with most on this, the 6mph does level the playing field. To answer the original question on what HP it will take....I bet on a given day depending on tractor, track, tires, etc., a 50hp tractor could beat a 200+ hp tractor. The 50hp tractor may only go 2 mph, but it could be done. I pull a 560 that that goes 250+ hp and I have a hard time competing and keeping traction at times in the 6mph class, thus speed limits do level the playing field. Now, in an open speed class or 12 mph, that's a different story.
 
not sure where ya all pull,but speed alone does not win or lose a hook,gearing,track prep,when you pull,when you use the Big power,where you drive,where you put the weights,of course it could happen that a two mph pull will win over a tractor going near or at 6 mph,VERY SMALL CHANCE !!!!!!! "EVER" Type of track,chain length and many more factors come into play. If you have 250 plus,use a higher gear,idle -- change it up to find what works,even steady hooks win over jerky jumpy pulls all the time,not speed,power or luck,how you know your tractor,how you drive and how you paid attention today,yesterday and last yr.makes a bigger difference.I agree that speed would even it up IF ALL TRACTORS HAD THE SAME POTENTIAL,same power,same gears,same tires,same fuel,same samoo,but last time I looked,not much the same!!!!!!!!! Same scenario happens with no speed limit,you must know your tractor,capabilities and use all tools available to you,we have some of the best clay in the country where I live,that my friends is the equalizer of tractors.
 
Yep : seen it happen time and time again. Tractors running less than the limit: and being on top of their game: outpulling the high horse tractors. Some do it because they don't have enough power to spin the tires.!! More often than not though, speed makes a difference. 1 or 2 mph not so much: 8 or so difference YES.
 
did we lose our freedom to express you did,tub weight is not the issue here,and my friend each scale is very different,and yes each type track will have different winners,whinners and such.bring your junk out to the track big mouth,let the pull results speak for themselves.name your poison,fast slow,loud,heavy,big.maybe you have to ask permission
 

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