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Old 09-20-2011, 05:00 PM
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Kumho 857 tire pressure?

I just put on new Kumho 857's and their max pressure is 65, which seems too high to me for my boat's load. I'm not even sure if the wheel is rated to handle that much pressure. I was thinking of just running them at the 50 that I ran my Marathons, but was wondering what you all do. Thanks.
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Old 09-20-2011, 05:49 PM
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my guess is the tire is rated for max 65 psi at max load??? My truck tires are rated for 80 psi at max load, but I run at 60 psi to give a bit softer ride when running without a load.

Unless the combined weight of your boat, trailer, gear, etc. is close to the maximum capacity of the number of tires on your trailer, you should be able to run a lower psi and be fine. The tires should show a maximum pressure in psi and maximum load capacity per tire on the sidewall.
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Old 09-20-2011, 07:20 PM
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Yes, they do, and the max load is well over what my trailer weighs-2150 per tire (or 8600 total), and I'd put my trailer at 5500.
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Old 09-20-2011, 07:25 PM
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45 - 50 should be a good number. Watch tread wear. If you are running too low you will have more tread wear on the outside edges.
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Old 09-20-2011, 09:12 PM
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Quote:
Originally Posted by thatsmrmastercraft View Post
If you are running too low you will have more tread wear on the outside edges.
And more HEAT. Hot tires go boom!

Although Marathons have 50 psi on the sidewall Goodyear recommended running them at 60 psi for sustained highway driving. I'd run the tires you have at 65psi. Most trailer tires are meant to be run at max psi
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Old 09-20-2011, 09:19 PM
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Quote:
Originally Posted by nmcjr View Post
I just put on new Kumho 857's and their max pressure is 65, which seems too high to me for my boat's load. I'm not even sure if the wheel is rated to handle that much pressure. I was thinking of just running them at the 50 that I ran my Marathons, but was wondering what you all do. Thanks.
Isn't the pressure & load rating supposed to be on the sidewall? They're not Marathons- don't run them the way you think they should be, contact the manufacturer.
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Old 09-21-2011, 12:17 AM
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The max pressure rating is on the sidewall, but there is no reason you have to run at that level unless you are near that load. ST tires have stiff enough sidewalls that you can operate them at less than max (within reason) without a problem. It is not the same as if you were running P metric car tires. I also don't run the tires on my F150 at their max unless I have the truck loaded or am towing.
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Old 09-21-2011, 11:24 AM
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I run my Kumho 857 @ 50 psi and don't really see a buldge at the bottom of the tire sitting.
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Old 09-21-2011, 11:26 AM
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Same way with my truck. Load range E tires rated to 80 psi, I run them at 60 to keep from being beat to death. If the truck was loaded to its max towing rating, I would put them to 80 psi.
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Old 09-21-2011, 11:27 AM
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Quote:
Originally Posted by rspiecha View Post
I run my Kumho 857 @ 50 psi and don't really see a buldge at the bottom of the tire sitting.
Can't argue with success. Well, I guess there are plenty people here that would, but..........................
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SPECIAL ST205/75R15 LRC KENDA LOADSTAR ON 15X5 WHITE SPOKE WHEEL, BALANCED & DELIVERED - $125

Tandem Axle Packages Starting at $569 - 4 Aluminum wheels, 4 ST205/75R14 tires, mount & balance.
Single Axle Package Starting at $319 - 2 Aluminum wheels, 2 ST205/75R14 tires, mount & balance.

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