View Poll Results: Do you have radial tires or bias ply tires on your stream?
Radials. 47 74.60%
Bias Ply. 16 25.40%
Voters: 63. You may not vote on this poll

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Old 04-17-2006, 09:32 PM   #1
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A week ago I figured out the tire codes and to my suprise the skins on the Airstream were 10 years old , they were always covered and dressing applyed , they look new !!! NO cracks , they are 7.00x15 8 PLY
Now should I go with Bias ply or Radial ???? those bias are so rugged looking !!!! You tell me ,,,,,,,
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Old 04-17-2006, 10:56 PM   #2
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Hello scf31,

Now youve done it ! opened the floodgates of airstream tires ,and choices,whos right ,whos wrong ,who?You will get alot of input here,then be confused and not sure.Anyway we all want to help you with your question.I will tell you what I use on my 1960 tradewind single axle. I use 700-15 bias ply tires with that rugged look .Thats what I want ,the look that Im after.I run hercules tires with 4 sidewall plys and 5 tread plys ,thats the construction and they are not "ply rated" as many are ,meaning that they have less plys such as 2 sidewall and3 tread plys but are RATED as a 8 ply in strength.I have used greenball towmasters with no problems ,looked rugged also,Their D range tire was less rugged looking ,so I got the hercules D range.
These tires are listed as LT ,as all the bias ply 700-15s will be .Im very happy with them . have not had any trouble with them .I only offer my experience with these tires and hope that this helps.

good tire luck!

scott of scottanlily
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Old 04-17-2006, 11:33 PM   #3
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scf31,

I would go with radials. The equivalent diameter of your 700-15 is the 235/75r15 but, if you go with a trailer tire then it is the ST225/75r15 which is approx .75-1.0 inch smaller in diameter. You will tow a little bit lower but, I doubt if you will notice it on a 25' trailer. Might have to adjust your weight dist. hitch. I had to change one link when I recently went from the 235/75r15 down to the ST225/75r15.

Radials have less rolling resistance, generate less heat, and should deliver somewhat better fuel mileage on a heavy trailer like a 25 footer. Haven't tried to document this fact yet though I have towed approx 1800 miles with the new tires. It is a proven fact in large class 8 trucks, automobiles, etc. where you have controlled circumstances that radials will outperform bias tires thereby delivering more mpg.

Radials have two steel belts under the tread and are much better at turning a nail, screw, etc. on the road.

Only drawback to radials is that if you curb a tire, the bias carcass will probably stand up better than the radial. The radial is thinner in the sidewall and can be cut thru by a sharp curb, rock, etc. easier than a bias tire.

Just my .02
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Old 04-18-2006, 06:06 AM   #4
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Radials are a little wider, and lower iin profile than the bias tires. They roll easier, and tend to last longer, tread-wise. They also ride a bit softer. The bias tires are a bit taller, and narrower. Rolling resistance is a bit more, and they will tend to "bounce" a little when they are first driven in the morning.
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Old 04-18-2006, 09:38 AM   #5
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Hi--I have always run 7.00-15LT C rated bias tires at 45psi on my 1973 27' Overlander with no problems. Time for new tires and I am considering Goodyear "Work Horse Rib" bias in the same size but D rated, as that is what is most available. Scale weight on 4-tires is 6200 to 6400 lbs. Those of you who run similiar D rated tires do you run at 50, 65, or some other psi? Also high pressure valve stems? I am aware of dimensional and side wall bump strength differences noted above, satisfied with the way bias handle on my A/S, and at this time plan to stay with bias, which are currently more expensive than radial ($107 vs $90).--Frank S
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Old 04-18-2006, 09:54 AM   #6
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Quote:
Originally Posted by wingfoot321
scf31,

It is a proven fact in large class 8 trucks, automobiles, etc. where you have controlled circumstances that radials will outperform bias tires thereby delivering more mpg.

Radials have two steel belts under the tread and are much better at turning a nail, screw, etc. on the road.

Only drawback to radials is that if you curb a tire, the bias carcass will probably stand up better than the radial. The radial is thinner in the sidewall and can be cut thru by a sharp curb, rock, etc. easier than a bias tire.

Just my .02
Actually the research shows that the MPG improvement on trucks is limited to the use of radials on the drive (power) wheels and there is no significant benefit in mpg having them on the other axels. However, other safety facotrs require not mixing them on the tractor. I have bias on the 59 because it looks right and radials on the 68 because they fit best.
Factors like brake adjustment and load balance are likely to have more of an impact on your trailering experience than the type of tyre.
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Old 04-18-2006, 12:28 PM   #7
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You could add a poll to this thread and make it a little more fun.

I believe you could use either type (radial or bias) and either would do the job well. Assuming the tire is rated for the job and it's properly maintained.

I believe correct tire inflation is the single biggest issue to getting the job done. I am not convinced of the benefit of a radial tire versus a bias ply on a trailer is significant unless the usage is something like 10,000 a year. For me the weekend user the savings in mileage is small.

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Old 04-18-2006, 12:58 PM   #8
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My understanding, from a guy who's been in the tire business since Christ was a Corporal, is that Bias-ply tires track better than Radial tires. The one draw back is that, if you leave them set for a while, you get flat spots, and you have to get going for a bit to get the tires warm, in order to get the flat spots out. I have Radials on our Sovereign, and I have Bias-ply on our boat trailer, and I have to say that I like the Bias-ply tires better.

Frederic
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Old 04-18-2006, 01:07 PM   #9
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scf31 brought up an interesting issue regarding the age of the tire.

I follow the rule of thumb to replace tires after 5 or 6 years regardless of tread wear (don't get enough time off to travel enough to actuall wear 'em out). One time a bought a set, and found out later 1 of them was already 3 years old, even though it was still 'new'. The tire dealer tried to tell me that the timeline didn't start until the tire was put on the road, but since I'm paying I'd rather have them be all the same age, and recently manufactured.

Anyway, now I tell the dealer that I care about the date on the tire and make sure they're 'new' before putting them on.
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Old 05-06-2006, 09:35 PM   #10
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The 1984 Excella 31 FT came from Airstream with the Michelin XCA 7:00/15. It was a Radial.
I have a pair for posterity/measurement, not for use.
They are way too old to be used safetly.
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Old 05-07-2006, 01:54 AM   #11
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hello everyone ,

all good questions and answers ,My other reason for the bias 700-15 is definatlely more stable ,radials have a very wiggly sidewall ,by design.The bias has a ,much stronger sidewall ,4 plys verses 2 for the radial. the radial has less rolling resistance that I have noted especially when bias plys are cold .I wouldn,t trade 5 actuall tread plys for 2 or 3 though ,i have to go stronger on my single axle .remember todays bias tires are much better tubless tires than the old tube type .I have never heard of a 700-15 radial.

Scott
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Old 05-07-2006, 07:18 AM   #12
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Quote:
Originally Posted by scottanlily
I have never heard of a 700-15 radial.

Scott
Our Argosy had 7.00R15 Michelin XCA radials on it when we bought it.
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Old 05-07-2006, 08:43 AM   #13
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You can email Michelin and ask orWait a few days and I'll post a picture of the antiques that I have.
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Old 05-07-2006, 08:46 AM   #14
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Question Tire Mfg date?

Quote:
Originally Posted by scf31
A week ago I figured out the tire codes and to my suprise the skins on the Airstream were 10 years old , they were always covered and dressing applyed , they look new !!! NO cracks , they are 7.00x15 8 PLY
Now should I go with Bias ply or Radial ???? those bias are so rugged looking !!!! You tell me ,,,,,,,
How do you figure out the mfg date on tires? What are the codes?
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