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Posts: 2026
| I have Kumho 857s, which have a cold PSI of 65 and are speed rated around 91 mph I believe. However, when driving on them an hour last week they felt warmer to the touch than normal, and registered at 74 psi. Granted it was hot outside, but that seems a bit high. I drive between 70 and 75 on the interstate. What is considered a "normal" psi increase under tow? I have less than 2000 on my bearings, and they hubs were not warm at all. I ask because I have a 16 hour tow in a few weeks.
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Posts: 1749
Location: Mt. Zion, IL | chalk the tires and examine tread contact to determine tire pressure. Inflate to a point where you get even chalk marks on the concrete/asphalt indicating full contact.
What does the wear on the tire look like? Is the wear even across the tire with a tread depth gauge? At that high of pressure, I would expect the middle of the tire to have more wear than the shoulders. |
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Posts: 1209
| Your trailer will have a psi rating on it for the load, the air holds the load irrelevant of brand or style of tire. On page 6 of facts on the good year endurance trailer tire there is a chart for load capacity of each tire per psi.
So running max pressure with not enough load to flatten the tire out you may end up like a motorcycle tire, this picture is a wet out of the lake tire that picked up sand where the tire was touching the ground.
And if the tire is not flat it may be accelerating the wear in the center/ making more heat.
I do run a few more cold psi in my trailer but not 15 more. The chalk on the tread is the same as the sand in my picture but backwards. When I had 65 pounds in my tires I determined it was to much and looked into why (picture attached is without the boat on the trailer but I had the same results with the boat loaded at 65)
Edited by Fishysam 6/26/2018 8:48 AM
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 5F837C33-368A-4E50-8CEA-7B78484B92CD.jpeg (149KB - 461 downloads)
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Posts: 795
Location: Delavan, WI | Hi Jason I met you at the last spring bay outing, take my opinion for whats its worth, I have been in the automotive industry for over 25 years. The max rating on a tire is just that , doesn't mean its what you should put in the tire its a manufacturer spec so people don't go above it and blow it out, I personally run my trailer tires at 35-40 psi, pulling a 19 ft ranger with tandem axles, if it were a single axle I would probably go to 45psi - it is my opinion running them at 50psi or above your boat gets a much harder ride over bumps, train tracks etc. thus putting more stress on trailer and boat, there is no need to run it at max press - most passenger cars nowadays run between 30-35 psi so that you get a nice soft ride, trucks is a whole different story |
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Posts: 228
| I have a Ranger Reata 1850 and the single axle trailer has a sticker on it to run the tires at 65 psi !!
Bob
Edited by bob1 6/26/2018 7:48 PM
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Posts: 2026
| I didn't chalk my tires, but the dust from my road on it looks like the pic Fishysam attached. I have no manual for the trailer, as I got it used. Plus, I upgraded from 13 inch to 14 rims, since I was very close to the weight capacity in 13 inch Cs. I'll attach a pic of the tires with almost a full load. But I do think I'll run at 60 psi next trip. |
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Posts: 3504
Location: Elk River, Minnesota | Hiya!!
Trailer tires are built differently than auto tires...where this is most notably different is in sidewall construction. Being the trailer tire has a load rating on it, it only reaches that load rating when the tire is at the max psi. So... if you run the tire below your max inflation, you are actually not reaching the load rating for weight in the tire. This creates more heat in the tire, thus premature blow out. Also, the extra bouncing of the tire due to lower pressure increases that heat as well.
The tires are designed to run a couple of psi over the max rated and the pressures will rise as you run them... so. Running around 5 psi over when your tires have been running for a while is normal.
Q rated trailer tires... pretty nice deal there.
Steve |
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Posts: 444
Location: Duluth, MN | Scroll down to the section about trailer tires. The chart is there. If you have tires on the trailer other than what it came with then it doesn't matter what is printed on the trailer you then need to use the chart.
http://popupbackpacker.com/tire-pressure-secrets-for-camping-traile... |
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Posts: 612
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Location: 31 | Nice info / good stuff !!! |
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