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Question: Rule of thumb for tire inflation vs ply rating?

I

Indiana Ken

Well-known Member
I have a wagon running gear with a small dump bed from an old truck mounted on it. The tractor PTO is used to run the original pump to dump the load. I have been using it the clear some rocks and concrete debris long ago dumped in the woods.

My question is what pressure should I run in the tires. It has 7.00x14.5 - 8 ply tires. The previous owner run 100 psi however on the road it rides likes it has steel wheels which cannot be good for the wagon gear. I have lowered the presure to 65 psi which supports the load without squatting and rides much better on the road.

Is there a rule of thumb based on ply rating?
 
Somewhere in the "fine print" molded on the tire you should find a "maximum load/air pressure" statement. That is what I would use. 100psi seems a bit high.

Rick
 
Did you look on the side wall of tires? They have the max. tire preasure marked on them. !00 psi sounds to high. I have 16"-10 ply on my truck and 70 psi is max on them.
 
As a rule, usualy to is 10 LBS per ply. How ever I usualy go at 70 lbs on my truck as I don't allways go loaded. But with those I would go with 80 lbs max. On travel Trailor I do go with 60 lbs on Load range "D".
 
I may be off but someone will correct me if I am but I think load range C is 6 ply rating which are usually 35 to 44 psi max, load range D is 8 ply rating usually 60 -65 psi, load range E is 10 ply rating usually on most HD 3/4 ton pickups 80 psi, so yes 100 psi too much.
 

I have been down on my hands and knees without my glasses, crawled around the tires twice and have not been able to find any pressure recommendation stamped on the tires.
 
14.5 sounds like a trailer house wheel.If they made a standard wheel that size, it got by me.
 
Ken it sounds like you have trailer house tires on your trailer. Eight ply trailer house tires run 65 pounds air pressure max.
 
have 3 14 foot trailers here that i built about 25 years ago to haul sweet potatoes out of the field. they have mobile home axles/wheels with the 14.5 tires. we always ran 110 lbs of air. trailers were loaded to max and never had tire problem. do remember 2-3 blow-outs over the years. was no problem hearing them. those around us that ran 60-70 lbs air were always twisting tires off in the field or having flats. will say that if we did have a flat from a nail of what that local tire shop would air to 70 lbs and give us the hose to finish.
 
Some low-boy tires are 14.5 Several years ago I bought a pickup load of 14.5 tires on 6 hole wheels that looked like they fit a chevrolet pickup. The tires did not wear long on trailers
 
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