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Old 02-11-2018, 02:32 PM   #11
CWtheMan
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Originally Posted by socalhd View Post
Okay guys thanks for all the info.
After checking with local tire shops and getting price quotes here is the outcome.
I ordered the Sailun S637t 235/80 R 16 from SimpleTire online. Per many recommendations.
Price was less than $600. Shipped to my door and Discount Tire will Mount and balance for $25. Per. I priced the G614 at Discount Tire and they would have been close to $1500. Installed.
My wheels already gave the steel High Pressure Valve stems which is a plus.
Again thank you for the informative input
Sailun ST tire spec sheet.
Note the rim width.

http://www.sailuntires.ca/images2/637/637st.pdf
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Old 02-11-2018, 02:53 PM   #12
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"Tires should only be mounted on approved rim widths. If changing tire size, the rim/wheel must have adequate load and inflation pressure capability. For rims/wheels not so identified or for service conditions exceeding the rated capacities, consult the rim/wheel manufacturer to determine the rim/wheel capabilities." (On page 37 it's recommended to consult with the vehicle manufacturer about bead seatings).
+-

See page #33 in the reference below. (Chapter four addresses RV tire fitments and applications).

https://www.ustires.org/sites/defaul...TruckTires.pdf
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Old 02-15-2018, 12:28 PM   #13
MattE303
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Originally Posted by CWtheMan View Post
Sailun ST tire spec sheet.
Note the rim width.

http://www.sailuntires.ca/images2/637/637st.pdf
I contacted the Sailun rep that I got the tire inflation chart from a few months back, asked him about the rim width discrepancy (most of our wheels are 6", Sailun spec sheet indicates 6.5" for s637t tires). Here is his response:
"In regard to your question about wheel width, a 6.5” wheel is recommended, however; the 6.0” and 7.0” wheel width is allowable. There is no risk around the safety of the tire in your application.

There could be a minimal effect on the wear on the outside rib of the tire. The narrower wheel “pulls” the beads of the tire in slightly. This can cause the footprint of the tire to not sit completely flat on the road (shoulders slightly raised off the road). The result is possible irregular wear on the shoulder. This situation is compounded if the inflation pressure is higher than the recommended pressure. It sounds like you have a pretty good handle on your inflation if you are following the chart. Just keep an eye on the shoulder wear. If you see irregular wear start to develop, you may be able to lower the pressure slightly if you have 10 psi of safety built in. Don’t go below the recommended pressure though."
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Old 02-15-2018, 12:56 PM   #14
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Just as a side note to the tires, Sailun recommends 6.5" wheels on their 235 series tires. I looked on Trekwood rv parts to see if they had wheels and tires for mine which they do but wheels are 6", not 6.5" as per recommendation I seen from Sailun. I guess the 6" must be .50 cheaper so that's why Keystone uses them...lol!
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Old 02-15-2018, 06:11 PM   #15
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I am running the "Provider" Tires that came on our Laredo and they are serving us well. ST235/80R16E If at the end of 4 years they are still doing there job I will replace with the same.
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Old 02-18-2018, 03:18 PM   #16
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I have seen a lot of posts about tires, the different makes and different ratings. We just bought a 2018 Cougar 25RES and it has trailer king st radials 225/75r15 load E 80 PSI. Can anyone break all of this down for me?
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Old 02-18-2018, 03:23 PM   #17
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I have seen a lot of posts about tires, the different makes and different ratings. We just bought a 2018 Cougar 25RES and it has trailer king st radials 225/75r15 load E 80 PSI. Can anyone break all of this down for me?
WAY OVERSIMPLIFIED: Trailer King and Goodyear Marathon , bad. Carlisle, Sailun, Maxxis, good. Goodyear Endurance, probably good (too new on market to know how they wear yet.)

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Old 02-18-2018, 03:27 PM   #18
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Are these something that will at least last me for a while? What kind of speed rating?
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Old 02-18-2018, 03:38 PM   #19
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It seems that on this forum, the general consensus is to get rid of them, the sooner the better. The argument most have is which brand to use as a replacement, but for the most part, we all agree Trailer King is not a brand to trust beyond the driveway....

You may get 10 years of reliable service from them. That's 5 years beyond the recommended "age out" time frame. Then again, you may wind up with $8,000 damage to your trailer on the first trip. It comes down to whether you're willing to gamble or not? Some are lucky, some aren't.... How many lottery tickets do you buy and how often do you win????? That might be an indicator of whether you should trust your TK's..... Then again, maybe your luck will be different...... Too early to tell, eh?

ADDED: As for speed rating, if your tires have no speed rating marking on them, then they are rated at 62MPH, if they have an L the rating is 75MPH and M is 81 MPH. But most of us would advocate to never drive faster than the speed limit and certainly well below the 75 or 81 MPH rating of the tires. After all, a 6000 pound trailer with "magnetic brakes" may not stop as rapidly as you'd need in an emergency.
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Old 02-18-2018, 04:08 PM   #20
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Quote:
Originally Posted by MattE303 View Post
I contacted the Sailun rep that I got the tire inflation chart from a few months back, asked him about the rim width discrepancy (most of our wheels are 6", Sailun spec sheet indicates 6.5" for s637t tires). Here is his response:
"In regard to your question about wheel width, a 6.5” wheel is recommended, however; the 6.0” and 7.0” wheel width is allowable. There is no risk around the safety of the tire in your application.

There could be a minimal effect on the wear on the outside rib of the tire. The narrower wheel “pulls” the beads of the tire in slightly. This can cause the footprint of the tire to not sit completely flat on the road (shoulders slightly raised off the road). The result is possible irregular wear on the shoulder. This situation is compounded if the inflation pressure is higher than the recommended pressure. It sounds like you have a pretty good handle on your inflation if you are following the chart. Just keep an eye on the shoulder wear. If you see irregular wear start to develop, you may be able to lower the pressure slightly if you have 10 psi of safety built in. Don’t go below the recommended pressure though."
The normal procedure for rim widths is to establish an acceptable range. It might be 6" - 7.5''. Within the range the tire manufacturer will establish a measuring size. Their tire fitment specs will correspond with the size of the measuring rim. With a single size recommendation such a 6.5" there is no wiggle room. Saying something else is hearsay without a published standard.

When a rim is marked with a single width it's the vehicle manufacturer's responsibility to waver it's uses with any tire fitment that is not a standard fitment for such a rim. That's why the vehicle certification label has basic wheel sizes on it such as 16x6J or 16x6.5J and so forth.
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