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Tire pressure

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Rich

05-08-2003 14:06:04




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I have just mounted a set of worn 15.5 Firestone 151s on 16 inch rims. I am trying to decide where to start with air pressure. It took about 25 psi to get the tires to seat, and I have left them for about a week, but I am sure I will need to cut it back to get traction. I am thinking maybe 15 psi, but I do not want the tires to break down from the rims. The tractor will pull in the 3500# and up classes. Any suggestions?

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G Taylor

05-13-2003 06:20:56




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 Re: Tire pressure in reply to Rich, 05-08-2003 14:06:04  
A relatively tall/narrow tire for the weight class requires more air pressure than a short/wide tire in a light class. The 11.2x38's on the 50 were squatting low/wrinkling in the 5500lb class at 12psi on sticky clay. The 435's 16.9x30 in the 4500lb class on the same sticky clay track were too tight at 9psi. Having the rims as wide as the tire and using an old hard set of high ply tires. Will reduce squatting and tread bar roll back/tip.

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Paul

05-08-2003 20:23:50




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 Re: Tire pressure in reply to Rich, 05-08-2003 14:06:04  
It will depend more on weight transfer more than any thing else. Out west we generally pull with a longer chain (less weight transfer) 6-12'chain some times longer in heavy weights. In the south and east a 6' chain is long and weight transfer is greater. I personally rarely run over 8-9lbs. sometimes as low as 5lbs. Paul



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Eric

05-08-2003 19:14:33




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 Re: Tire pressure in reply to Rich, 05-08-2003 14:06:04  
I've never ran more than 10.5 pounds in my 15.5's on 14" rims up to 6500#, but track condition, weight, and horsepower are all factors that you must consider. Good luck.



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Mike Aylward

05-08-2003 14:54:24




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 Re: Tire pressure in reply to Rich, 05-08-2003 14:06:04  
Rich, your tire pressure will likely depend on how heavy you want to pull. At 3500 lbs. 15 psi will be plenty, but if you pull in the heavier classes (such as 5500) 15 should be about right. I always use as a rule of thumb when I am sharpening tires to add about 2 psi for any given size for each 1000 lbs. of weight that is added. This being said, I would start at about 11-12 psi at 3500 lbs. and go up from there. There is no reason to run less than about 10 psi with the tires you have on right now. There are proponents for running very low air pressure but when you do this you lose drawbar height and kill any advantage you get with the bigger footprint of the lower air pressure. Hope this helps. Mike

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Mfarmallpuller

05-08-2003 21:19:58




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 Re: Re: Tire pressure in reply to Mike Aylward, 05-08-2003 14:54:24  
We have run as low as 10 pounds of air in ou 666 before in weight transfer pulls weighing 9300 lbs before and it never hurt anything and we have won at that weight and tire pressure. Tire pressure is fine as long as you don't have it too high or too low , 10-15 lbs is plenty for the weight that anyone around here is ever going to pull at.



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Mike Aylward

05-09-2003 15:09:21




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 Re: Re: Re: Tire pressure in reply to Mfarmallpuller, 05-08-2003 21:19:58  
I don't want to get into an argument or say that your setup doesn't work. But if a fellow is hooked to a sled with a regular length chain too low air pressure will flatten the tires too much and eliminate any weight transfer you get from the sled due to losing drawbar height. If you are using a very long chain on the sled lower air pressure may help some because you are not going to get any weight transfer anyway. But more pullers use too little air instead of too much. If you see the sidewalls buckling, you need more air. And if you have cut tires this is especially important. Mike

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Jack

05-12-2003 07:19:48




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 Re: Re: Re: Re: Tire pressure in reply to Mike Aylward, 05-09-2003 15:09:21  
I agree Mike!I don't want anything taking away from my drawbar height.My 16.9 38 Flintstones like 14-16 psi,less than that too much sag and there goes the drawbar height.



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Ken

05-09-2003 18:31:49




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 Re: Re: Re: Re: Tire pressure in reply to Mike Aylward, 05-09-2003 15:09:21  
I pull 3500 lbs class . I don't know what kind of HP you have but I run 15 lbs on a hard track and less on a soft track this years mud pulls I call them a hard track. I pull 1st. or 2nd most of the time



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Mfarmallpuller

05-10-2003 10:48:03




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 Re: Re: Re: Re: Re: Tire pressure in reply to Ken, 05-09-2003 18:31:49  
WE have about 175 horse coming from the 666 IH and we run around 10-12 pounds in HIGH side of 4th gear and usually win in the class we are in. Then on my M I run about 12 pounds and it has about 65 horsepower wieghing from 4500-8500 spinouts usually aren't my problem It holds traction all the way to the end



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Don

05-10-2003 05:30:18




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 Re: Re: Re: Re: Re: Tire pressure in reply to Ken, 05-09-2003 18:31:49  
Check your tracks when you spin out. if the hole has a crown in it, you tires are to soft. a flat hole is best



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