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CJW8's avatar
CJW8
Explorer
Oct 29, 2016

Another tire post

My 2015 Keystone Raptor came with Trailer King 235/80/R16 tires. I was skeptical but figured I'd run them till one failed and then replace them. At about 5100 miles on a 1800 round trip in June they all failed. Fortunately they didn't blow out, they just started bubbling on the sidewalls. I put on the spare and bought a Tow Max to replace the worse one. The other two failed on the return trip but I took it easy and they got me home.

After a lot of research I decided to try Sailun 235/80/R16 S637 tires. These are 14 ply tires. My dealer didn't have them in stock and were on back order from his distributor. He did have ST 235/85/R16 in stock which is slightly less than an inch taller. They were on sale for 169 so I got 4 mounted up and installed. Same specification, 4080 lb rating at 110 psi. The sidewalls on these tires are very heavy whereas on my old tires you could literally smash an unmounted tire flat. No way could I do this with the Sailuns. They are also significantly heavier. Another bonus id these tires are rated at 75MPH.

We'll take an 800 mile round trip next week and I'll get to see how they ride.

Thanks to those on here who have shared their experiences.
  • You will be very happy with the Sailuns. I'm going on 2 years with them and they look like the day they were installed. Over last winter they all lost a whopping 3 psi each!
  • Wheels say 110 psi max on the back. I checked before I bought. Professionally balanced and installed with high pressure metal stems. I have run a TPMS system since 2008. Yes, I will drive 70-75 if conditions allow and the law allows.
  • CJW8 wrote:
    My 2015 Keystone Raptor came with Trailer King 235/80/R16 tires...After a lot of research I decided to try Sailun 235/80/R16 S637 tires. These are 14 ply tires. My dealer didn't have them in stock and were on back order from his distributor. He did have ST 235/85/R16 in stock which is slightly less than an inch taller. They were on sale for 169 so I got 4 mounted up and installed. Same specification, 4080 lb rating at 110 psi...They are also significantly heavier. Another bonus id these tires are rated at 75MPH.


    How did you go about confirming that your wheels were capable or certified for 110psi? Also, I think the Sailun's are rated at 75mph only if fully inflated to 110psi.
  • If we all had been running Sailun instead of all those ST tires, we wouldn't have had near as many issues. The Sailun seem like they may age out, but gonna be tough to wear them out. :)
  • We've all had tire problems , normally you'll have a tire going soft it adds load to the good tire and BOOM !!!! . Before we took out last trip I bought a set of tire pressure monitors by "Tire Tracker" best money I ever spent you ride down the road and know exactly what your tire pressures and temperatures are. Spend the $300 and enjoy your trip rather than be consistently worried about your tires.
  • Know your actual weights and inflate per Weight/Inflation chart plus 5psi. Most likely 85 -90 psi will do the trick. 110 will most likely give a rough ride.
  • Replaced all by TOWMAX(BLOWMAX) with the Sailuns 18 months ago and have almost 12000 miles on them with no issues.
  • Yes and I would not drive that fifth wheel at 75 mph even with those tires... Also I do hope the tire installer replaced the valve stems with metal high pressure ones..

    Good luck with new tires
  • Your story mirror what thousands of other trailer owners (rv and non rv) have found when they have tire zippers......tread separations......complete tread loss/etc with the light weight ST E tires.
    A commercial grade all steel ply carcass 4080 ST G is a good choice for 7k axles or max loaded 6k axles.