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Old 12-22-2013, 08:53 AM   #1
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why not car tires

why not use high mileage car or truck tires on trailers? i can't believe trailer tires don't last any longer than they do. car tires face ten times as much abuse due to heat, cold, high mileage, fowlweather,etc. the tires on my truck have over 65k miles, and are 6 years old . they still have 1/2 of the tread left and the rubber looks as good as new. i have car tires on my flat bed trailer with no problems. it has been all over the mid west and to the east coast. just asking. what am i missing here. bill

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Old 12-22-2013, 09:30 AM   #2
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How long is this flat bed and what does it weigh empty.

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Old 12-22-2013, 09:53 AM   #3
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From my understanding it has to do with the sidewalls.
I believe the sidewalls in cars & trucks are thinner/softer and designred more so for comfort, whereas trailer tires are thicker and stiffer and designed for weights and the sway of the trailer.

I really dont know the specifics, but I know using passenger tires for trailer tires is not a good thing.

I'm sure someone here can tune us all into the actual facts.

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Old 12-22-2013, 10:14 AM   #4
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I also wonder about that. I know many motorcycle riders use car tires on the rear of the bike. It is mostly Gold Wings and other large touring bikes. I understand why they do it with MC tires costing upwards of $150 and car tires at $60-70, plus a MC tire is good for ~~12,000 miles while a car tire goes 40,000+. And, many of them use run flat tires.

How about run flat tires for an RV trailer?
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Old 12-22-2013, 11:22 AM   #5
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Most of the passenger car tires I've seen don't have anywhere near the load rating of the ST tires. I can understand folks using LT tires but not passenger "P" tires.

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Old 12-22-2013, 11:55 AM   #6
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the thinner side wall does make sense, but the deteriation of the tir and rubber does'nt. sounds like they use cheap materials in trailer tires.
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Old 12-22-2013, 12:28 PM   #7
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I wouldn't recommend car tires on a trailer, but my dad took the tires off his 74 Ford LTD and put them on his 1978 24' Coachman and literally towed it from MO to TX to CA to WA to Nova Scotia and back to MO with no problems. I sure wouldn't have tried it, but he was successful doing it.
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Old 12-22-2013, 04:00 PM   #8
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Car tires (Passenger=P) can be mounted on trailers up to 9,999#. The drawback is their size and the fact they MUST be derated by about 10%. Most often wheelwell and axle spacing clearances cannot be achieved with the larger P tires. However, the P tires are frequently used quite successfully on Airstream trailers. You can visit their forum and read all about them. They seem to like the Michelin brand. They like the softer ride provided by the more flexible P tires.

The tire of choice is the P235/75R15XL with the highway all-season tread design. That tire is 28.9" tall with a section width of 9.3" and it will fit on 6" wide rims. It's load capacity is 2183# but that figure must be derated by dividing it by 1.1 to get the acceptable value for trailer service of 1984# at 50 psi.

Most of the trailers that tire is used on are under 7500# GVWR and dual axle.

Note: ST tires have a sidewall construction to help eliminate sway. A light truck tire does not have that construction. The ST tire sidewall construction is stiffer than P tire sidewall construction but softer than LT tire sidewall construction. The best way to confirm that is to pick-out a popular LT tire manufacturer and send them an e-mail.

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Old 12-22-2013, 06:22 PM   #9
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load rating has a lot to do with it. Also your car tires aren't drug sideways during turning like on a dual or triple axle trailer. Different construction. Is a shame that we only get 1/10th the mileage out of them when they cost the same and are "Made in China"
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Old 12-22-2013, 07:01 PM   #10
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I run 235/75r16 LT's Load Range E and have never had an issue. With that said, trailer purpose tires say on them "for trailer use only". Ever wonder why? This takes away the liability from tire manufacturers if someone ran them on a vehicle and experienced a blowout. They simply are not built to vehicular standards and the manufacturers know this.
You can not beat the reliability and service from a truck tire when compared to a "trailer use only tire". Always check and make sure you have a high enough load range and check your pressures. Good luck with whatever you choose.

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