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Old 12-26-2013, 07:09 PM   #1
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Another dumb tire question...

My TT came with load racge C tires. These are TowMax Chinabombs... and I've already had one separate. I replaced it with the same size Maxxis and have had no other problems.

I know sidewall flex generates heat and the faster they flex, the more heat is built up... and that's why tires fail if not damaged by something else. With the increased pressure, it would seem to me that I could go faster because the sidewall would flex less at the higher pressure.

I have a trip planned in February that's about 1k miles each direction. The Interstate speeds are up to 80 mph in stretches out west. So, here's the dumb question: If I go to load range D tires and run 65psi instead of 50, can I SAFELY drive faster, like 70 or 75?
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Old 12-26-2013, 07:41 PM   #2
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The tire manufactures have a limit of 65 mph on all ST tires. So the short answer would have to be no. Many people do drive over the 65 limit, what we do not know is if they have a tire fail. Just because they do not have a problem does not mean it is OK of travel at this speed. Many people also drive their cars over the speed limit and never get a speeding ticket. Just because they were never caught does not make it right to speed.
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Old 12-26-2013, 08:42 PM   #3
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Kumho 857 or rated for 89 miles per hour. I don't run more than 75 on down hill runs. But not sure of any other tire. Not sure on the air them over and running faster. Sounds bad to me. Most of the tires are max 65 and max air max weight then they blow.

http://www.tirerack.com/tires/tires....del=Radial+857
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Old 12-26-2013, 10:07 PM   #4
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First, make sure that your wheels are rated to 65psi. They may not be.

Second, Maxxis responded to a dealer inquiry by one of our members (wmtire) and indicated that if you use the load table and increase the PSI by 10psi for the load, you can travel at 75mph. Above that, you start to derate the load carrying capacity and increase the pressure. If I were going to bank on this, I'd want individual wheel weights - not just total axles or even individual axle weights. It can be tricky to get them depending on where you go for weights. The load table is based on the wheel carrying the most weight.

That said, I'm a staunch 62-64mph driver regardless of speed limit (the highest speed limit that I've driven it has been a 70 or 75 mph area). It's a dark day for me when I exceed it for any length of time.
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Old 12-26-2013, 10:11 PM   #5
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Quote:
Originally Posted by jlgail4309 View Post
Kumho 857 or rated for 89 miles per hour. I don't run more than 75 on down hill runs. But not sure of any other tire. Not sure on the air them over and running faster. Sounds bad to me. Most of the tires are max 65 and max air max weight then they blow.

http://www.tirerack.com/tires/tires....del=Radial+857
this is very interesting info

I don't see 225 /15's or 235/16's as an option from them in that speed rating and I know several that run both at 70 to 75 mph including myself however we are all over gvwr rating by 30% or more and were not hauling at max gvwr or out axles as printed on the stickers. in the op's case I would go to a better tire with a load range E. this is my personal opinion as I understand st tires but a better brand is still required and I know that's not an easy task since 99% of st tires are made in china.
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Old 12-26-2013, 11:02 PM   #6
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Your right 14 is the only size the Kumho 857.
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Old 12-26-2013, 11:15 PM   #7
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Mine are 14" tires... I normally travel at 65 towing. I can honestly say that I have gone 70 downhill not really watching, but catching myself and realizing I was over where I usually am... It's just that I've never tried to tow a TT that far... and at 65 it's gonna be a LONG trip. I want to upgrade my tires, anyway. I don't like to be on the side of the road, for any reason.

Thanks for the info, folks...
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Old 12-26-2013, 11:38 PM   #8
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We have had our kumho tires (14") for a year with about 2000 miles. We usually keep our speed at 67-70 tires never a problem.
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Old 12-26-2013, 11:40 PM   #9
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I had a tire deformed on my new trailer. Then started looking for a speed rated tire. This is a R rated tire and hold 2094 pounds. It's the best I could find.
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Old 12-27-2013, 07:29 AM   #10
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Quote:
Originally Posted by schrederman View Post
Mine are 14" tires... I normally travel at 65 towing. I can honestly say that I have gone 70 downhill not really watching, but catching myself and realizing I was over where I usually am... It's just that I've never tried to tow a TT that far... and at 65 it's gonna be a LONG trip. I want to upgrade my tires, anyway. I don't like to be on the side of the road, for any reason.

Thanks for the info, folks...

Dang I am old...I remember 55 saves lives
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