tire pressure

I have an Oliver 88 with 15.5 x 38 Firestone deep treads, pulling on a hard clay track this coming weekend. Classes are 5000 thru 7500 pounds. What air pressure should I run and should I change pressure in each class? Any help appreciated.
 
My personal opinion in clay if its tight run standard pound per inch of tire width or as much as 18. I run that all the time. If its biting hard you don't need to worry about contact because when it gets down to the lugging the tires will be squaring plenty with 15. I say as much as 18 if your tires are softer sidewalls. So I'd say maybe 14 15 in the first class and go from there. Weighting does come into affect too if ytou has front weight lower the pressure but if you have mid or rear weight run harder... All I do is pull in clay unless its a dryer summer then I need more squat...
 
berry,an 8 ply deep tread is very hard,stout,no side wall squat til 10000#,don't give advice when not informed.
 
I've been pulling 4000# to 10000# for over 12 years in clay not to mention farming clay for 20. You want him to stretch his sidewalls he can do it. I agree a flat tire crown works. But unless is sloppy he doesn't need to drop pressure for traction since a tight track will flatten his contact patch. Maybe if he's running a lightened tractor on pressed steel centers. But stock cast 300 pound centers like that on my 770 is a load on 7 pounds of air. Then when the weight box is forward he will have almost as much sidewall on the ground as tread. Its not as though 15# will crown his tire. I ALSO added it depends on weighting.
 
AND I may add I didn't run out of traction on m equivalently powered 770 last season AT ALL on my 8 ply 70 percent firestones at 15# pulling 5000 and 5500.
 
Again; No one-size-fits-all formula here. what works one place will not at another. "trial and error" is the only accurate method. I personally do better with just a slight amount of "squat".
 
And that meaning? That since I didn't have "deep treads" still had plenty of bite in clay with 15 POUNDS of air haha
But instead of thread robbing for to argue a point when I started with IN MY OPINION ill leave it there.
 
berry,in another post you asked for advice,so please,the uninformed are all over!! Yes it is a judgement call,always,track reading is an art many can not master,but that is what wins pulls,and knowing your own tractor is all it takes,no one can tell you how,it is a learned art,with lessons from experience and passion if you pay attention.Real clay is hard to find,I am told,;WE HAVE CLAY",WHEN I GET THERE IT IS SANDY SILT !!!! every day,every track,every one is different,all tires will work,just need the right air pressure,balance and driving technique.Have a Happy pulling season,share,laugh and enjoy,win or lose.
 
I asked about weight placement and horsepower figures not tire pressure, traction... I have pulled mainly cockshutts up til my Oliver 1850 in weight classes. So I didn't know the weight balance on my 770 or how much power has been turned with what tweaks. Anyways if it is a tight track, pressure shouldn't need to be dropped. MY OPINION
 
the man asked about deep treads,very different from any other tire,old,very heavy,hard,square and needs special treatment,everything comes down to the tire in pulling,farm experience means nothing,power,speed,balance,hitch height and choice of where to drive matters,but in the end,where and how the rubber meets the dirt is all that there is.Nothing works well all the time,just ask your wife !!!!!
 
Jesus Christ you just have to have the last word don't you. Maybe you need that little blue pill but that info doesn't matter here. Haha you should just stop cranking your puncture wound on here and write a book about how much you're in love with yourself. I said my piece and left it peacefully in that. I know all that matters. However instead of asking him everything including which way he tucks his pecker I shared a basic insight I have.
 
berry,now the whole world knows how ridiculous you are,some people are new at pulling,some are thankful for advice,some are nice,some are not,my -- my my how not Christian some are,I will pray for you.you should follow your own advice.
 

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