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SUBJECT: # 12622: Ranger Trailer Tires Wearing on Outside - PSI and Speed Rating?

Submitted by Tinfish ( from TEXAS on 5/6/2007 11:11:00 AM

I have a Ranger 518 on a single axle trailer with Goodyear Marathons installed. The tire on the driver's console side (wow, would this be what you call the driver side or passenger side???????) has worn very badly on the outside tread only - to the point it now has to be replaced. I would estimate I have 10 to 20K miles on the tires. The opposite tire has also worn on the outside; though, not nearly as bad. Tread across the remainder of both tires is good. I try to maintain 45 psi in the tires. I've checked past posts and see that many others have had this same problem and many say to have it aligned at the frame shop - and some pointed to tires not being properly inflated. The stickers on the trailer call for 50 psi (I thought that meant max???). Could maintaining pressure at 5 psi under the recommended pressure be the problem, or do I need to have it checked for alignment? I am having new Marathons put on next week and don't want to waste them. Also, I checked the Goodyear Tire Homepage and found the following Tech. Sheet regarding Marathons. For those of you who drive over 65 mph, as I do, do you overinflate your ST designated tires as they suggest here? Thanks! Scrad.

(1) Industry standards dictate that tires with the ST designation are speed restricted to 65 MPH under normal
inflation and load conditions unless a different speed restriction is indicated on the sidewall of the tire.


(2) Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is
necessary to increase the cold inflation pressures by 10 psi above the recommended pressure for the load.

  1. 5/6/2007 11:26:00 AM Submitted by JohnM from TN says I'd have the alignment checked
    Based on one side wearing much faster than the other. I just replaced the Marathons that came standard on my 2003 Champ single axle traielr. They were worn on the outside but still had tread left just worn more than the middle. I figured 4.5 years and no telling how many miles it was time. I ALWAYS run mine at 50PSI and yes I break the 65 MPH barrier often LOL. I have been known to let one roll when it's safe to do so. Knock on wood I've not had a Marathon failure on any of my travel trailers or boats. I will tomorrow for sure LOL. I checked my new Marathons as soon as I got home a week or so ago and sure enough 40 PSI is what they had in them. Like I said I jacked em up to 50 and let her roll. Some wear on the outside comes from sharp backing turns etc... is normal.

  2. 5/6/2007 11:29:00 AM Submitted by Ron Rook Sr. ( from PA says Trailer Tires.....
    Isn't it interesting that some Bass Boat mfg's don't use trailer tires on their tandom axle trailers? Could it be because Goodyear Marathon's are only rated up to 75 mph and not anymore regardless of the tire pressure....

    Have you driven on the LA freeway system lately? 75 mph appears to be the minimum speed limit.... Yet many P series tires have speed ratings far above that 75 mph limit....

    I'm convinced that any tire that is rated to carry a specific load with a margin of safety will do just fine on a bass boat trailer. I'm not talking about a trailer that hauls skid loaders, etc....

    Heck, we aren't overloading our boat trailers like the RV industry does with their travel trailers or fifth wheelers and we would benefit from using P series tires instead of a set of Marathons and save a few bucks along the way without any handicaps of a top speed limit.

    In a previous post below I reported on Goodyears trailer tires when I talked to a Goodyear Factory Rep. He also mentioned that dealers make more money on trailer tires of specific weight carrying capacity than they do on P series passenger car tires. We have far more choices for P series tires for our bassboat traielrs than with Marathons ST tires.

    So it appears that 75 mph is the "TOP" limit for any Marathon tire. That ain't all that good if you experience tire problems. I think I'd like a better safety cushion than running them right at or above their speed rated limit. Over the years I've read where installing P series tires has solved many bassboat trailer tire problems.

  3. 5/6/2007 11:44:00 AM Submitted by Ron Rook Sr. ( from PA says JohnM
    I didn't intend to take anything away from your suggestion. Surely an alignment check is always in order to make sure the tires/axles are correct.... Just offered another thought to consider along with your idea.

  4. 5/6/2007 12:59:00 PM Submitted by Jeff Hahn from OH says Always run 50 psi
    Tinfish: ALWAYS run the Marathons at 50 psi. This is the psi at which they were made to perform best. If you need the alignment specs for your trailer, call the Ranger Trailer Department (870-453-2222) and talk to Curtis Rory. He will give you the camber, caster, and toe-in settings. Just make sure to ask him if these specs are with the boat on or off the trailer.

    Jeff Hahn

  5. 5/6/2007 5:44:00 PM Submitted by JohnM from TN says Heck Ron I've run P tires as well
    I was not always as blessed finacially as I am at this time. There was a day when all I could afford was the 19.95 special at the local tire shop LOL. I have drove plenty O' miles on those as well. I did have a blow out on one back then but I put my 20 buck spare on and kept on going. These days I can afford what I consider to be the best for the job in the Marathons so that's what I get. I paid 160.00 bucks for two white letter tires a couple weeks ago. A bargain compared to my truck tire prices. With the price of tires today tied to the price of oil it's a good thing I am anal about tire pressure in all my stuff like everything else I own. As for the 75MPH rating heck I never knew that, I've stress tested that limit MANY a time :)

  6. 5/6/2007 6:31:00 PM Submitted by beartrap from GA says when all is said and done
    I think you are gonna find that the problem is your marathon tires....had same uneven wear patterns with marathons for several years with different current Ranger had marathons on it and started that outside wear pattern about a year after i got it.....had trailer checked by two different alignment shops and they couldn't find anything wrong with it....put kelly Charger tires on it and have not had a problem nor an uneven wear pattern in 9 years...I have replaced the tires twice however I put in a lot of towing miles including a 3000 mile trip to Mexico each year....

  7. 5/7/2007 7:47:00 AM Submitted by fishsmart ( from TX says Suggestion
    Check the axle for being bent upwards in the middle.


  8. 5/7/2007 9:00:00 AM Submitted by Chevymon... ( from OH says Uh....
    most all are bent up in the middle for weight.

  9. 5/7/2007 10:16:00 AM Submitted by Philip McClung sr ( from VA says Tire wear
    Check how high your trailer tongue is when towing. Wear on the outside of your tires can be caused by the trailer tongue to high when towing. Your trailer should be as level as possible when towing.

  10. 5/7/2007 2:50:00 PM Submitted by Tinfish ( from TX says Thanks!
    Thanks, everyone. You've given me a lot of ideas and I'm going to use them all to investigate further. I'll let you know what I find. Safe fishin' - Tinfish

  11. 5/7/2007 4:00:00 PM Submitted by bassnman30 ( from NC says Goodyear Marathons
    Had one just the other day that did the same as your's. Went to the tire shop and had it replaced with a new one. I told the guy that it was one of the tires that had developed a "bubble" on the side, that tire had to be replaced as well as this one. I asked him what the problem was and he replied with "it's a Goodyear". Next time they wear out I'm going to a different type. It'll happen soon enough, from previous comments, It'll happen sooner than later.

  12. 5/10/2007 5:24:00 PM Submitted by squib ( from TX says Me too
    Same problem with the same tires on the same boat and trailer. I even swapped out the axle with a new one from Ranger. If you find the fix, please post it. I tow long distances often. I am more afraid of tire failure than just about any other boat/trailer issue.

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