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Old 03-04-2014, 08:32 AM   #1
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Buying new tires, Bias ply or radials

Replacing tires, the camper has ST's on it now which to my understanding are bias ply tires .
Which is better bias ply or radials?
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Old 03-04-2014, 09:00 AM   #2
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ST is the designation for a trailer tire. I use the bias ply tires on my rig and have had no major problems with them Some however prefer the radial type. What type on on your rig now. The letter after the size will tell you if they are bias or radial. Bias is a D. Radial is an R. Or 205 75 D 14 would designate a bias ply tire.
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Old 03-04-2014, 09:09 AM   #3
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What ever you do, dont buy ST China bombs also check date code and make sure they are fresh. I would buy a tire that has a bit higher weight rating. Have you weighed your rig fully loaded? This is where you must start when buying tires
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Old 03-04-2014, 10:06 AM   #4
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The ST have a stiffer sidewall, so less squirm. I run STs on my car trailer and equipment trailer. Haven't had a TT since 76.
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Old 03-04-2014, 01:41 PM   #5
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Quote:
Originally Posted by MikenAmber View Post
ST is the designation for a trailer tire. I use the bias ply tires on my rig and have had no major problems with them Some however prefer the radial type. What type on on your rig now. The letter after the size will tell you if they are bias or radial. Bias is a D. Radial is an R. Or 205 75 D 14 would designate a bias ply tire.
An R does designate radial, but C, D, or E designates load capacity. Most trailers loaded tend to be at the Max for their factory tires. Safe bet is to go up to next load designation. C to D. D to E .

Bias ply tires are more forgiving for sitting longer. Radials give better ride quality but flat spot quicker and break belts - cause of many blowouts. Trailer tires have always done best for me if inflated to Max allowed on sidewall. Got 6 years out of my trailers original tires.
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Old 03-04-2014, 03:37 PM   #6
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Be Aware of Tire Size Conventions

Before this thread blows up, you all should know that there are different ways of describing a tire and for trailer tires there are at least three different conventions.

Here is a good link to explain a little. Understanding Trailer Tire Sizes
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Old 03-05-2014, 07:38 PM   #7
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Link doesn't work...
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Old 03-05-2014, 07:56 PM   #8
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Originally Posted by schrederman View Post
Link doesn't work...
Strange...worked yesterday.

Try google "trailer tire sizes", the Bass ProShop link is third or fourth down
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Old 03-06-2014, 08:10 AM   #9
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I got radials, I believe what you said NFlcamper about the ST tires holding up after sitting a long time , the original ST tires from 02 were still looking good with no signs of dry rot.
Now that I have radials do I need to put it on jack stands when it's parked a long time?
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Old 03-06-2014, 08:24 AM   #10
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How long is long?
6 months, I would. One month, I wouldn't. But keep the pressure maxed out either way. Also, if you park it on 2-3 layers of old carpet scraps, they will conform a bit and reduce flat spots considerably.

Get them balanced, too. Many are not from the factory.
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Old 03-07-2014, 07:05 AM   #11
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I put D rated STs from New Zeland on my TT last year and did almost 10,000 miles with nary a problem. My TT weight would handle C rated easily but I went stronger with Ds. Seems to work for me. Don't remember offhand if they are Radial or not but they have worked well and show almost no wear for the mileage. Just make sure you know the LOADED weight of your rig and buy tires capable of that weight with a little reserve capacity.
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Old 03-08-2014, 12:06 AM   #12
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Any reports on the "new" Carlisle tire?

"The new and improved second generation Radial Trail RH combines two new Carlisle technologies. Utilizing DuraTrail technology, a high strength belt package with micro-fiber reinforcement and fully optimized ply construction, the RH Series offers improved load-carry capacity and lateral stability, reducing trailer sway. Heat Shield technology combines specially blended heat resistant polymers, producing a tread compound with superior heat aging endurance."

http://www.carlisletransportationpro...adial-trail-rh
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Old 03-08-2014, 10:40 PM   #13
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I do believe mine are RH Carlisles but I'll have to stop by storage to double check
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Old 03-09-2014, 02:35 PM   #14
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We went to check our TT today and looked at the tires and found several small sidewall cracks, we just bought it used (2012) last august and thought the tires would last longer so that makes me wonder: where are we better off getting new tires: shore tire company (local truck tire company) or an RV dealer? any thoughts?
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