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Open Roads Forum  >  Travel Trailers

 > need new tires

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rbs62

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Posted: 01/18/12 12:46pm Link  |  Print  |  Notify Moderator

i have a 1978 wilderness 18 ft camper that apear to have the tires that came on ti plenty of tread but side walls are showing cracjks in them they are 700-15 what do i replace them with i think 700s are hard to find..

ExRocketScientist

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Posted: 01/18/12 01:03pm Link  |  Print  |  Notify Moderator

rbs62 wrote:

i have a 1978 wilderness 18 ft camper that apear to have the tires that came on ti plenty of tread but side walls are showing cracjks in them they are 700-15 what do i replace them with i think 700s are hard to find..

I take it they are 15 inch wheels. What is the load rating of the tires and the max pressure? Also the outer diameter. This will help in choosing new tires.

Upon further research, there may be an issue with the rim width, so what is the width of your rims?


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donn0128

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Posted: 01/18/12 01:17pm Link  |  Print  |  Notify Moderator

Coker/Firestone markets a 700 15 tire listed as their military tire. I see them for $117,00 each. Do a web search and you will find tons of information on replacements for that size.


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JJBIRISH

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Posted: 01/18/12 02:44pm Link  |  Print  |  Notify Moderator

Just a guess…

27 1/2 Inches = P215/75R15, P225/70R15, LT215/75R15...

27 inches = P205/75R15, LT205/75R15... P215/65R16... 255/50R17...

Your 1978 tires are cracking!!!

Your new ones might do that in just a couple of years…


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smkettner

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Posted: 01/18/12 04:57pm Link  |  Print  |  Notify Moderator

I think you need ST205/75R15-C or ST225/75R15-C

What is the wheel width? What is the trailer GVWR? 2 tires or 4?

http://www.tirerack.com/tires/tiretech/45_conversionchart.html


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JIMNLIN

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Posted: 01/18/12 06:59pm Link  |  Print  |  Notify Moderator

The 700-15 is a old 6 ply rated bias ply light truck tire with approx 1700 lb of capacity @ 50 psi at around 29" tall. They work best on a 5.5" wide wheels. Very common 1/2 ton pickup tire size back then that savy RVers mounted on their trailers when the passenger tires gave out.
Replacement tires depends on the trailer GVWR and axle ratings and the old wheels width.

I would suggest a radial replacement such as a Maxxis ST205/75-15 C at 1820 lbs capacity at 27" tall. The tire matches a 5.5" wide wheel requirements. This will make your trailer one inch lower plus a bit better braking performance.


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ExRocketScientist

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Posted: 01/19/12 04:59am Link  |  Print  |  Notify Moderator

JIMNLIN wrote:

The 700-15 is a old 6 ply rated bias ply light truck tire with approx 1700 lb of capacity @ 50 psi at around 29" tall. They work best on a 5.5" wide wheels. Very common 1/2 ton pickup tire size back then that savy RVers mounted on their trailers when the passenger tires gave out.
Replacement tires depends on the trailer GVWR and axle ratings and the old wheels width.

I would suggest a radial replacement such as a Maxxis ST205/75-15 C at 1820 lbs capacity at 27" tall. The tire matches a 5.5" wide wheel requirements. This will make your trailer one inch lower plus a bit better braking performance.

Those trailers from the 70s were notorious for dragging the back end easily. I don't think it should be lowered any. I'm thinking get some wider wheels so that he can mount tires that are at least 28" in diameter. The ST225/75R15 load range C would work, but something like the Maxxis UE-168 Bravo LT235/75R15 Load Range D aired down to 50 psi would work well too. It is 28.9" in diameter.

Sunbird

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Posted: 01/19/12 05:14pm Link  |  Print  |  Notify Moderator

I have never seen anyone wear out the tread on a trailer tire, I have seen and had a lot of them that had blowouts. I had one blow out while mounted on the bracket on the rear bumper. It had died of old age on a 1999 trailer.

Get load range D tires, Cs are too marginal.

Raise YES, lower NO!





jetboat

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Posted: 01/19/12 08:17pm Link  |  Print  |  Notify Moderator

There always is a debate about tires,"ST" vs. "LT". In the end,and personaly,i've always gone with the "LT" tires.

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Posted: 01/19/12 08:38pm Link  |  Print  |  Notify Moderator

Quote:

........ The ST225/75R15 load range C would work, but something like the Maxxis UE-168 Bravo LT235/75R15 Load Range D aired down to 50 psi would work well too. It is 28.9" in diameter.

But if it's aired down to 50psi, it will not have the load carrying capacity that is load range D. In order to have the stated load capacity, it would require 65psi. Now, it may be true that he does not need all the load capacity that is represented at 65 psi, but as always, the rules of tire inflation still apply. Personally, I'd be more inclined to run LR D tire and inflate them to 65 psi. First make sure the wheels are rated to that inflation pressure, and I'd use metal valve stems. And as always, I would watch them with my infrared thermometer for sure for the first few trips to make sure they are not getting overly hot.

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