Re: Tire air pressure

Posted by JoeBob/IN on March 05, 2007 at 13:23:13 from (216.117.22.1):

In Reply to: Tire air pressure posted by IaGary on March 05, 2007 at 04:38:45:

I assume this is in reply to my post so I will try to prove why I said what I did. The link is from the Firestone site. Lets use my Case 2390 for an example. It weighs roughly 14000 lbs with the weights on her. And I guess that it is balanced to about 40/60% front/rear. Could be off there but close enough for now. So 60% of the 14,000 is 8400 lbs on the rear axle and 4200 per tire. It has 20.8R38's so according to the chart I should run at 8 psi since you can load a max of 4300 per tire at 8 psi. Even if it is balanced to 30/70 we would run at about 11 psi. But I run duals so according to Firestone we have to drop our max axle loads 12% per tire. At the 30/70 the per tire load is 2450 + 12% so we get a max load of 2744 and our psi would be as low as 6! Now there are cases where you would add pressure such as high road speeds, furrow plowing, and hillsides to increase stability. Remember that you have to add the weight of any attached equipment but not drawn equipment. And you shouldn't load radial tires but rather add cast weight, it doesn't allow the tire to flex properly! Look at the Firestone, Goodyear, and Michelin site carefully and you will see that radials are great tires when used correctly.

• Radial pressure chart

Replies:

• Michelin has a nice pressure calculator JoeBob/IN 13:33:34 03/05/07 (0)

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