Cool Canuck
Winnipeg, MB, Canada
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First. If we go to and investigate the rims we find that CT&W 14 inch rims are good for 1870 lbs @ 50 psi.
Second. Under inflation means under inflated for the load carried. As example, I have never ran max tire pressure in my truck. @80 psi it would jar your teeth out. I air the tires for the load carried which would be 65 psi front and back when towing my trailer.
With most trailers, the tires are minimal for the load carried therefore recommended running them at max allowable pressure. That being said, the same rules apply and the tires only need sufficient air pressure for the load.
Check most passenger cars. The tire pressure listed on the door post is usually less than the max tire pressure listed on the tire side wall. Running with the proper pressure for the load, puts maximum tread contact with the road.
You can run the tires @35 psi if you want. I would probably run them at 40-45 psi myself. That would give lots of excess capacity, better fuel mileage and help keep them from rolling off the rim it those tight turning back ups.
Each to his own, but I would prefer a higher capacity tire any day.
* This post was
edited 05/12/08 07:40am by Cool Canuck *
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mmanske
Baton Rouge La.
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Something I have wondered about.....Why the #&!! would the PSI ratings be stamped on the inside of the rim? This is like putting the opening instructions on the inside of the package!
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Cool Canuck
Winnipeg, MB, Canada
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mmanske wrote:Something I have wondered about.....Why the #&!! would the PSI ratings be stamped on the inside of the rim? This is like putting the opening instructions on the inside of the package! From what I understand, they are not even stamped. At least mine aren't. They put a sticky label in there. Good luck finding that.
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JJBIRISH
Butler, PA, USA
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Cool Canuck wrote:mmanske wrote:Something I have wondered about.....Why the #&!! would the PSI ratings be stamped on the inside of the rim? This is like putting the opening instructions on the inside of the package! From what I understand, they are not even stamped. At least mine aren't. They put a sticky label in there. Good luck finding that.
you are correct it is a sticky label, not even a good sticky, one that can be easily removed...
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Road Trip
Virginia
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Michelin publishes a tire load/inflation chart/book.
It requires you weigh the trailer(preferrable each wheel) and then use the proper pressure.
My trailer owners manual has a recommended pressure. Having weighed each wheel I found this pressure more than adequate for the weight.
My aluminum wheels has the weight on the inside (cast numbers), the side that faces the brake drum.
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NHguy
NH
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What you need is the load and inflation table for the 185R14 tires. I was able to find a max load of 1700 at 65 psi(but no table)for the Load range D's. But the wheels can only be trusted to 50 psi without further inspection. Still don't panic because the trailer only grosses to 4400 lbs. I am sure 50 psi will handle more than 1100 lbs. It is too bad you didn't check this stuff before hand, the original size tires would have carried a little more load. And if you'd gone ST20575R14 load range C they carry 1870 at 50 psi. But either way you are well able to carry the weight of that TT.
What is not so obvious to some of the posters in this thread is that load range varies with tire size. So a Load Range C of a bigger size carries more than a D of a smaller size. Some of the tires load capacities cross over, Example an LT2857516 D (8 ply) has the same capacity as an LT26575R16 E (10 ply).
Anyway those tires will do fine for carrying capacity, but don't take them in soft sand, they are so narrow they will cut into the sand and sink.
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bkwatson69
columbia,s.c. usa
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Don't forget th Valve stems. When keystone sent me five new tires to replace the sorry Missions that Had came on the TT.(had three to have cords seperate within a year and a half. first one was within a year.) anyway, I mounted the new tires myself and replaced the valve stems with new ones I had bought from Advance Auto Parts. Had one tire leak down several months later due to the valve stem while sitting. Then last year on the way to Disney World had a tire leak down and blow out and leave the Darlington stripe all around the wheel well. Problem was the valve stem. I later noticed on the package for the valve stems that those were only rated to 60psi. I ended up replacing all the valve stems with the metal ones that bolt into the rim.(held in with a nut over the valve stem). These I think are good to 120psi.
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4aSong
Northwest Arizona
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Thank you to all for the information provided as it has helped greatly. Further research has confirmed what Cool Canuck  had mentioned. I have some additional research to do but for now I have decided to run them at 45psi which seems to be acceptable (It looks like the 14x5.5JJ rims will support the pressure) based on the weight of the trailer (3300lbs. dry) and with carrying capacity for a total of 4400lbs.
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NHguy
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I apologize, but I under rated the tire. I am at work on break now and a new catalog came acros the desk. 185R14 C's by Kumho can handle 1874 lbs at 65 PSI. So you are definitely OK. Good Luck.
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