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Old 11-26-2014, 10:46 PM   #1
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Rainier ST Tires - Speed Rating

Our Jay Flight came with Rainier ST tires. I've never heard of these, but have attempted to do a little research. The size we have is 225/75R15 ST. They are 8 ply, load range D, max cold pressure of 65 psi. I know most ST's are speed rated at 65 mph, however these appear that they may be rated a little higher. Only other numbers I can find (besides the obvious ones) that appear to reflect load and speed rating is the 113/108L. I know the 113 = 2540# for single, and the 108 - 2200# for dual. The "L", all I can figure is the speed rating, which in this case would be 75.

Not trying to start a China Bomb thread nor do I care to get into the how fast one drives threads. I have my preferences, but I am trying to figure out what exactly I have now. I can't find much on them, but know that Tredit tire carries them. I have an email in to them to see what info they can provide. I did find a set somewhere else that claimed 75 mph rating as well.

Any help from the tire gooroos out there. I'm used to Goodyear G614's, and I'm far from that now.
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Old 11-27-2014, 07:02 AM   #2
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I see that Rainier tires are being sold by many dealers and have been around a while. Those markings are the load index/speed rating. The "L" designation = 75 mph. From what I have read speed ratings usually apply to passenger car (P metric) and light truck tires (LT). I just looked at my Maxxis 8008 ST225/75R15 Load Range E tires and there are no load index/speed rating markings on them at all. But they do have Max Load 2830 lbs at 80 psi markings. Apparently there is no speed rating below "L" = 75 mph. My guess is most ST tires are not speed rated so there are no speed rating markings whereas your Rainier tires have achieved an "L" rating so there is a speed rating on them.
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Old 11-27-2014, 07:45 AM   #3
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This is from a seller's add on "Ebay".


ST175/80R13 LRC 6 PR Rainier ST Radial Trailer Tire 175/80 13 75 MPH Speed Rated
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Old 11-27-2014, 10:46 AM   #4
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With the international nature of manufacturing we see all kinds of ratings and third party approvals used in ways that no american company would operate. Pure manufacturing sites often have zero engineering support, they build stuff and ship it.

So if you have a blowout at 75mph and the tire gets replaced for free who is going to pay for the trailer damage?

I don't trust ratings/markings.
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Old 11-27-2014, 10:59 AM   #5
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Yea, I drive no faster than about 60 mph on the interstate. The faster you go the more heat is generated by the tires and too much heat is the nemesis of all tires. Every time I stop I use an infrared laser thermometer to check my tires/bearings. Last year I found a brake dragging just after a dealer serviced them. I found it because one wheel was really really hot whereas the others were relatively cool. Backed off the brake and I was good to go on a 1000 mile trip to Key West. If I hand't checked I am certain I would have had serious problems farther down the road and it would have ruined our vacation.
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Old 11-27-2014, 11:25 AM   #6
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I would do some looking for info on the mfr's website. If one exists. They should be able to clear up your questions.
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Old 11-27-2014, 12:31 PM   #7
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Grumpy, I had came across that ebay deal, which is what got me really hunting yesterday. We usually drive 65 with the trailer. But, since I've never seen a ST tire with a speed rating, I got to digging since I saw the "L" on there. Just thought it was odd. Who knows if they are good tires or not. I can't find a manufacturer website for them. Only place I found was Tredit, so I've got a email request to them for more info. My preference is the Maxxis 8008, if I have to run a ST tire on a RV. I might change them out in the spring, or I might leave them on. To be determined.

You definitely can't go by brand as to what is good and what is not. Think Goodyear Marathon ST, vs. Goodyear G614's. 2 totally different animals.

We've been away from the typical RV with ST's for a while, so we've been accustomed to high dollar good tires for a while (On the RV). I've run the china bombs (Towmax, Carlisle, etc) on my goosenecks, car hauler and cargo trailers for years, and never had a failure. All with similar loads and abuse as a RV. However, I won't run them on a RV. RV's and those trailers are 2 different animals as well. I have my reasons. Obviously one is a LOT more money and the damage a tire can cause is day and night from a gooseneck to a RV.

Like mentioned earlier, please do not turn this into one of those china bomb threads. We've been doing this a while, and know all about them, and know what damage they can do. I've been fortunate to catch my few tire failures in time (We do run a TPMS). I am just curious about the Rainier since it's a tire I haven't seen, and it actually had a speed rating on it.
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Old 11-27-2014, 12:59 PM   #8
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BTW, many people may not be aware that big truck tires are usually only rated for 75 mph. So all you Prevost/Marathon drivers need to slow it down!
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Old 11-27-2014, 01:10 PM   #9
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Quote:
Originally Posted by wwsmith111 View Post
BTW, many people may not be aware that big truck tires are usually only rated for 75 mph. So all you Prevost/Marathon drivers need to slow it down!
That's why the old KODIAK chassis SENECA'S wouldn't go much over 75.
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Old 11-27-2014, 01:14 PM   #10
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So true. I don't think many people pay much mind to that. Not taking up for them, but I swear doing 70 in a class A feels like you're doing 45.
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