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Old 06-12-2005, 10:41 AM   #1
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Bias Belt vs Radial

-There has been much discussion utilizing "ST" trailering tires.
Trailering tires, in my search have a 2 ply polyester sidewall. This seems to be a weak spot, that blows out frequently.
Our Globetrotter had standard 7.00X15 biased belted tires. They had a 4 ply nylon sidewall, I believe.
My qusestion is, "Would a radial LT (light truck tire/trailering) tire run smoother than a old style belted tire. I know the usual montra is "ST" only for trailers. This is NOT my question.
I am comparing belted tires for ride, comfort, durability etc. to "LT" RADIAL tires of simliar size. (LT225X75X15)
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Old 06-12-2005, 10:57 AM   #2
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In the 60's, steel belted radial tires were starting to become popular, but there were still plenty of nylon and dacron bias belted tires around. The nylon belted tires weren't very popular because after they set in the cold for a while, they would take on a "flat-spot" set that would make them tire ride rough for the first couple miles after getting going again.

From memory, there wasn't much ride difference just going down the road in a straight line, but here was an advantage to the steel belted radial when cornering. The steel belts would keep the contact patch flatter, at least that was the advertising line of the day. Well made dacron tires like the ones sold at Chevron stations were the most popular because of smooth ride and durability. People would use nylon tires when they wanted a tough tire,hard to bruise or damage, say for off roading.

This line of thinking is still popular in Mexico today, based on what I've been told when traveling across the country or down Baja! The roads are so rough, most people prefer the nylon or dacron belted tires because there are too many failures with the steel belted tires. Common belief is the Michelins are the only steel belted tires which will hold up down there.
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Old 06-12-2005, 11:05 AM   #3
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Here's an informative site on the differences. http://www.michelinag.com/agx/en-US/...ias_radial.jsp

I'm not sure what you mean by belted tires. My understanding is that 'bias' and 'radial' are construction types, both of which can be belted, usually with steel.
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Old 06-12-2005, 02:08 PM   #4
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MARKDOANE,

I wanting to know if there is a ride difference between a biased tire or radial LT/trrailer tire. If both have a better(stronger) sidewalls than the "ST" tires, with a single axle trailer wouldn't if be more prudent to use a tougher tire? Having said this, my question is, "Are there any significant differences in quality of ride between a biased tire 700X15 or LT225X75X15 radial? They say "ST' tires satisfies rollability of, say, the airstream. But if older airstreams came with biased tires standard, and I wanted to have the benefit of a radial's rolling ability, and the strength of a biased tire, wouldn't a "LT" light truck tire satisfy this, without roughing up the airstream? I'm going to a Goodyear and Yokohoma dealer tormorrow to ask this question. I wanting any and all input to help formulate my questions. Thanks
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Old 06-12-2005, 02:17 PM   #5
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all of my non Airstream camping buddys have had "radial" tire problems and(knock on wood) I have had none on my 7.00X15 nonradial tires,never the less I help change them ,,,,, Scott
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Old 06-12-2005, 02:35 PM   #6
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Quote:
Originally Posted by Coloradobus
MARKDOANE,

I wanting to know if there is a ride difference between a biased tire or radial LT/trrailer tire. If both have a better(stronger) sidewalls than the "ST" tires, with a single axle trailer wouldn't if be more prudent to use a tougher tire? Having said this, my question is, "Are there any significant differences in quality of ride between a biased tire 700X15 or LT225X75X15 radial? They say "ST' tires satisfies rollability of, say, the airstream. But if older airstreams came with biased tires standard, and I wanted to have the benefit of a radial's rolling ability, and the strength of a biased tire, wouldn't a "LT" light truck tire satisfy this, without roughing up the airstream? I'm going to a Goodyear and Yokohoma dealer tormorrow to ask this question. I wanting any and all input to help formulate my questions. Thanks
Why not look into a 7.00R15 trailer tire?
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Old 06-12-2005, 02:39 PM   #7
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Quote:
Originally Posted by Coloradobus
-There has been much discussion utilizing "ST" trailering tires.
Trailering tires, in my search have a 2 ply polyester sidewall. This seems to be a weak spot, that blows out frequently.
Our Globetrotter had standard 7.00X15 biased belted tires. They had a 4 ply nylon sidewall, I believe.
My qusestion is, "Would a radial LT (light truck tire/trailering) tire run smoother than a old style belted tire. I know the usual montra is "ST" only for trailers. This is NOT my question.
I am comparing belted tires for ride, comfort, durability etc. to "LT" RADIAL tires of simliar size. (LT225X75X15)
One of the issues with using 225/75R15 LT tires is the load rating.
You do not specify which trailer you are towing, so I am not sure which load rating you will need, but the highest load rating in any 15" auto/truck tire is "C" which also limites your pressures to 45-50lbs.
ST tires are available in a "D" load rating, often required by mid to large Airstreams.
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Old 06-12-2005, 02:45 PM   #8
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Colorado,

All I've read indicates that radial construction (2-ply) gives a much softer ride. The belts provide better directional stability and less squirm. I would guess the bias ply tires would be more resistant to sidewall damage due to hitting curbs. I think the blowout propensity of radials may be more a factor of curb damage and separation due to underflation.

Not to say there weren't some manufacturing problems with Goodyear Marathons, that hopefully have been corrected.

I would say, it depends more on the type of driving you do. If you drive lots of interstate miles, go with the radials. If mostly back roads, go with the bias truck tires. In either case, you will get much better results if you watch inflation pressure carefully.

Be sure you read the previous threads on Goodyear Marathons, you don't want to get stuck with a set of defective tires.
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Old 06-12-2005, 04:03 PM   #9
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Thanks MarkDoane,
Thanks Uwe, at the top, I reported we own a 1967 Globetrotter.
I am a fanatic when it comes to tire pressure. Weighed the trailer and all tires are adjusted per tire air charts. I know where the tire manufacture date is and how to decipher it.
I haven't curbed a tire, nor had a blow out, just want to stay that way. There are several situations I know for tire failure: Over speed, over weight, or under inflation, or a combination of these.
Going to load range "D" has satisfied the weight issue on our trrailer, and adjusted pressure per chart. But wanting the rollability of a radial, for us single axle owners, wouldn't be prudent to obtain a tire with a stouter side wall? One manufacturer has come out with a Load Range "E" tire for 15 inches, but it has a 2 ply sidewall. Anyone know if there is a manufacturer who still makes a 700"R"X15???? MIchelin did at one time.
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Old 06-12-2005, 04:07 PM   #10
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When I was researching tires, I found that the category of tires known as "ST" was created to allow manufacturers to use stronger belts on the sidewalls of "Passenger Car Tires" to make trailer tires that would have less tendancy to sway, but would still be cheaper and easier to make than LT tires. Plus, the ST tires could be run at/or slightly above the pressures of Passenger Car Tires instead of the 65-80psi of commercial tires.

As for straight line ride "quality" nylon-vs-radial, on a smooth straight interstate highway, the difference is likely to be very small and would be subject to manufacturer's design objectives. There may be a difference in rolling resistance, but not likely in ride quality. As for rough roads, it would depend on materials in the sidewalls and how much they flex.

For the record, Passenger Car Tires have 2 ply sidewalls, ST tires have 2 ply sidewalls although they may be rated higher, LT tires have 2 ply sidewalls although they may be rated higher and Commercial LT tires have 2 ply sidewalls although they may be rated higher. The key to the 2-plys is the type, quality, and quantity of material used to make up a ply! There may be exceptions to the above, but I never found them in my research.
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Old 06-12-2005, 05:59 PM   #11
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Thanks Bob,

Our local Firestone store was open today. He told me he might be able to locate a 700RX15 radial. Otherwise, they have "ST" tires as well. May still consider a biased tires. Will see what I learn tomorrow. Until then, we will stick with the ST's we have. Now I need focus on the cadillacs new hitch. During a check today, for what ever reason I stood on the ball mount and heard a squeak. Turns out, the receiver crossbar flexes under my own weight, 182 lbs. One can only imagine what the trailer did on our test drive yesterday. Back to the hitch shop!
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Old 06-12-2005, 08:33 PM   #12
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Quote:
Originally Posted by Coloradobus
Thanks Uwe, at the top, I reported we own a 1967 Globetrotter.
Oops, I missed that one.
I am very interested in the outcome of your research, as I am in need of 5 tires for the Overlander. I currently have Carlisle 7.00x15 C bias ply tires on the trailer, but will not run the coach with them, as they are old now, and were very poor tires when they were new. Difficult to balance, and very wobbly and uneven on the balancer. I do this work myself, so I saw first hand wha the differences in "roundness" were between these Carlisles and the Marathons D that replaced them. Those were nice and round, and balanced like a regular tire, with 3/4 ounce and 1/2 once weights. The Carlisles required over 4 ounces, just to get them to balance on the rim.
But I did hear that many had trouble with Marathons, which is why I am interested in the alternatives.
My personal experience with the Marathons has been excellent, btw. I ran them for 2 seasons, on good, bad and terrible roads without a failure or even noticeable pressure drop.
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Old 06-12-2005, 08:36 PM   #13
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I found these on the tire rack website:\
http://www.tirerack.com/tires/tires....omCompare1=yes
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Old 06-12-2005, 09:27 PM   #14
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I think that ST rate tires are the way to go. The loading on a trailer is different than on a car or truck. For an aternative to Goodyear try Denman

But as stated in the original question, a lot depends on what your driving habbits are. Off the beaten path and back woods, bias may be the way to go. How are your axles?? Are your shock in good condition??? These will have a bearing on how your tires will hold up.
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