Forum Discussion

falconbrother's avatar
falconbrother
Explorer II
Apr 20, 2017

Trailer tires, radial vs. bias ply

From what I can see most travel trailers come with bias ply tires. My brother switched his out for automotive radials and claims they pull better and that he has had none of the issues that he had with bias ply, like chunks of tread falling off and blowouts. Is it safe to put radial car tires on a travel trailer? What about the weight ranges, car/truck vs. travel trailer?
  • JIMNLIN,

    I went back and read the post which I pasted here:

    ------

    Airstream does not buy these tires from Michelin, they buy them from a local tire dealer. I was in contact directly with Michelin two Airstreams back concerning my intended use of Michelins on one of our previous Airstreams. My email reply, from the VP of Marketing was short and sweet. "The Michelin Corporation does not manufacture a tire suitable for use on travel trailers and therefore your use of any Michelin tire on a travel trailer will void any and all warranties from The Michelin Corporation either written or implied".

    I put Michelins on, I had Michelins on our next Airsteam and I use them on our 2017 Classic. If there is an issue I am counting on taking care of it ourselves.

    -----------

    I missed the "two Airstreams back" which indeed dates this notification. You are correct in stating that things have changed.

    I also do not have an "agenda" is you insinuated. I was merely stating a fact that I read and one that obviously has changed over time. I do apologize for influencing anyone to avoid these tires.
  • rhagfo's avatar
    rhagfo
    Explorer III
    ScottG wrote:
    I haven't seen a bias ply tire on any trailer since the 80's.
    And there sure haven't been any of them at the RV shows.
    But I can tell you from towing with both that the radials have a lot more stick, especially in the wet.


    Bias tires were headed out the door in the mid to late 1960's when Michelin started selling radial tires in the US.

    I have been riding on radials since the late 60's.
  • My 2016 boat came on a trailer with bias ply tires. U-Haul is going back to bias ply tires. They run a little hotter, don't last as long mileage wise and give a little less fuel mileage, but they're more durable when it comes to catching curbs and pot holes and they're much less squishy which gives better stability. They also don't whip the trailer to pieces with steel belts when they blow at high speed. I go back and forth every time I have to buy trailer tires. I end up with radials due to availability more than anything.
  • Hannibal wrote:
    My 2016 boat came on a trailer with bias ply tires. U-Haul is going back to bias ply tires. They run a little hotter, don't last as long mileage wise and give a little less fuel mileage, but they're more durable when it comes to catching curbs and pot holes and they're much less squishy which gives better stability. They also don't whip the trailer to pieces with steel belts when they blow at high speed. I go back and forth every time I have to buy trailer tires. I end up with radials due to availability more than anything.


    X2 I find bias ply to be more durable also. Bias ply have continuous belts running from bead to bead and thus heavy side walls. Radials have the heavy belts, including steel, fixed onto the tread area only. Thus more likely to separate, fly apart, and cause more damage when they do. Bias are hard to find now though.
  • To me it seems the smaller the tire, the more likely to find availability in bias.
    Especially in 13 inch rim diameter and smaller.
  • eTrailer and Tire Kingdom have 15 and 16" bias ply trailer tires. It's out on the road if a replacement is needed that concerns me.
  • aftermath wrote:
    I also do not have an "agenda" is you insinuated. I was merely stating a fact that I read and one that obviously has changed over time.

    Sorry, my apologies sir....my "agenda" statement wasn't aimed at you but at those who know how to phrase a question to get a negative answer from any tire maker on this subject. And ignore/dismiss/pooh pooh all other statements on the subject Michelin or any tire maker has said before or after.
  • Many ST tires are still available in bias ply.
    http://recstuff.com/trailer-tires-wheels/trailer-tires/14-inch-trailer-tires/st205-75d14-load-range-c-bias-ply-trailer-tire-kenda-loadstar/

    Along with ST Radial.
    http://recstuff.com/trailer-tires-wheels/trailer-tires/14-inch-trailer-tires/st205-75r14-load-range-c-radial-trailer-tire-kenda-loadstar/

    I have had the Kenda K550 bias ply on my small travel trailer for 2 years and no issues.My TT does not see a lot of miles, although I did go from NY to Illinois 2 years ago with no issues.
    High milers are likely better off springing for the radials.

    Bias ply run a little hotter at highway speeds, but are said to have sturdier sidewalls to resist impact damage.

    Radials are said to run cooler at highway speeds and deliver better fuel economy to the tow vehicle. Will generally last more miles than bias ply if you tend to wear them out before you age them out like I do.
  • Community Alumni's avatar
    Community Alumni
    rbpru wrote:
    I think the fact that the RV industry puts over a million ST tires on the road every year pretty much tells you they have optimized the cost to performance issue.


    For years the RV industry has used wood behind fiberglass, silicone caulking, plastic bushings in the suspensions, those wonderful tank sensors, tires that barely support the full weight of the trailer, sometimes undersized axles, minimum gauge wiring, inappropriate connectors and housings for exposed environments, etc. They have done this for decades on end.

    You would think that just because something came as standard equipment then it must be the most appropriate. Sadly the RV industry does a better job of minimizing costs and maximizing its profitability than it does engineering its units. As most see when they upgrade items themselves, better costs more. There's been companies that have attempted to build better trailers and most have went out of business or been consumed by the big names. It's simply too difficult to build a trailer with better equipment and remain competitive with cheaply constructed units that flood the market. Items that come standard on trailers exist because the item made the most financial sense for the manufacturer. As long as it can survive the warranty period then its good enough for them, tires included.
  • I went to Northern Tool and bought a spare on Saturday. It was a ST205-75D15 rated at 1800 pounds. The tires on the brand new camper right now are ST205-75R15 rated at around 1620 pounds. At least I have a spare now. That should come standard with every trailer for safety reasons. I imagine the wholesale cost that the manufacturer pays to buy in bulk is bloody cheap. Especially compared to the danger and aggravation the customer suffers when a tire blows.