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Old 07-04-2021, 04:49 PM   #1
gwilkrrs
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Tire blow out #2 and 2/12

New to us 2007 keystone cougar 289bhs

Blow out on pass side rear tire on way home form purchase last year
Fixed and went out on 2 trips no issues

On way out this time picked up vibration 8 hrs into drive- 3 hours left on drive all seemed ok but had a vibration I couldn’t locate

2 weeks later on way home vibration got worse 2 hours in to drive home and got flagged over- nice guy said pass side front tire is wobbling/ bouncing-

Jacked up and rolled it and it wobbled- it had a zig zag in it like a belt had given away internally- change it with spare I bought- replaced when 1sr blow out.

5 hours later blow- out on pass side rear tire-

Damages to underbelly fabric- fender and body panels on lower slide and side panel under furnace

Put on wobbly tire to try to limp off 95 and didn’t make it far enough for service station/rest area before this one popped on sidewall right at deformed area


Had to have nj toll road dispatch a tire guy for 2 tires so I had a spare again-


I should have replaced all when bought rv but they were only 2 years old——

So frustrated-

Now to find parts
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Old 07-04-2021, 05:23 PM   #2
sourdough
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Sorry to hear about your troubles. Tires can cause a tremendous amount of damage. Those on a used trailer I wouldn't trust.

How did you determine the age at 2 years old? Did you look at the "born on date" on the side of the tire? I wouldn't be surprised if they weren't older than 2 years....maybe a lot. Also remember that RV tires age out, not wear out. IMO if buying a used trailer (I even do it on new) replace all the tires with new ones of a known reputable brand to hopefully prevent the unhappiness you've been through. Good luck getting it all straightened out.
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Old 07-04-2021, 05:56 PM   #3
gwilkrrs
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P O had a receipt that showed the tires purchase time but the age stamp on them was older-

I now have 2 brand new tires- mismatched make and a almost 1 year old tire

She wants me to use these 3 as spares and buy new tires and wheels for the unit

Worries me that the issues have been on the same spot tho-
Going to look everything over and see how to limit the damages for future

Needs a metal wheel well or just a flat metal piece to protect the u derbelly a different insulation at least
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Old 07-04-2021, 06:02 PM   #4
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I've concluded that the majority of RV tires are junk. Replace all the tires with a good brand like Sailun or Super Cargo. Keeping any of the old ones is just asking for more of the same.
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Old 07-04-2021, 06:08 PM   #5
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Thanks for the suggestions
Will look into those
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Old 07-04-2021, 06:26 PM   #6
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Your trailer originally came from Keystone with ST225 75D15 LRD tires. They were bias ply, probably rated at 2540 pounds @65PSI.

Almost all trailers now come with radial tires and I'd recommend you seriously look at upgrading tires to a 225 75R15 LRE (10 ply) which is the largest tire in that size range that will "comfortably fit in your wheelwells". They are rated at 2830 pounds @80PSI. While that may not seem like a substantial increase in load capacity, when you consider that your trailer's GVWR is 10375 and there's probably 1000 pounds being carried by the tongue, that leaves 9375 for the axles to carry. At 2830x4, you'll have 11320, about 2000 pounds of "excess capacity"... That's around the 18-20% recommended surplus capacity.

I would recommend Carlisle Radial Trail HD tires. They are among the best rated ST tires available, along with Goodyear Endurance and a "falling brand", Maxxis ST8008.

Endurance will run you around $140-160 per tire, Carlise is available at WalMart for $94 each https://www.walmart.com/ip/seort/55012166 Whatever tire you finally choose, have them mounted AND BALANCED !!! Many people fail to recognize the importance of properly balanced tires on a trailer where there are no shocks to help absorb/dampen the road hop and bounce created by unbalanced tires.

In the past 5 or 6 years, I don't recall anyone having problems with Carlisle RT HD tires.

You've got to realize (maybe you already do) that your trailer was built during a time when tire safety/safety margins were not a priority. Your trailer came with tires that barely could carry the axle load, much less survive the age degredation they encountered. I'm surprised that you made it as long as you did on those tires and would strongly urge you to replace them and possibly the wheels (depending on condition and their weight rating) before towing your trailer again.
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Old 07-04-2021, 11:22 PM   #7
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Quote:
Originally Posted by JRTJH View Post

Almost all trailers now come with radial tires and I'd recommend you seriously look at upgrading tires to a 225 75R15 LRE (10 ply) which is the largest tire in that size range
Many of the off brands are building the ST225/75R15 tires with two additional load ranges. The one below offers a LRF & LRG all steel.

I predict that within the next year, more recognizable brands will jump onboard in that designated size with the higher load ranges to stay with the competition.

http://transeagletires.com/
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Old 07-05-2021, 06:26 AM   #8
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Problem with using LRG 15" tires is that the wheels where originally fitted with LRD which is a 65PSI rating; I use LRE (80PSI) even though the wheels probably were rated for less and have had no problems. LRG? Once you start going north of 100 PSI (almost twice the pressure of the originals) you might run into rim issues and buying a new set of rims seems to me a good idea.
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Old 07-05-2021, 07:03 AM   #9
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Problem with using LRG 15" tires is that the wheels where originally fitted with LRD which is a 65PSI rating; I use LRE (80PSI) even though the wheels probably were rated for less and have had no problems. LRG? Once you start going north of 100 PSI (almost twice the pressure of the originals) you might run into rim issues and buying a new set of rims seems to me a good idea.
I agree !!! Finding 15" rims with 5 lugs that are rated above 65PSI or 15" rims with 6 lugs that are rated above 80 PSI is a very difficult task.

We had a thread about this several months ago. One member posted a link to heavy duty rims, rated higher than 2540 (5 lug) or 2830 (6 lug) is questionable at best.... One tire/wheel dealer advertises them on their website, but when researching, the "heavy duty wheels" rated higher than 2830 had the same part number as the 6 lug 2830 wheels.... That just doesn't make any sense to this old fart.... You can't have the same part number and two different parts, one rated "normal" and one rated "for heavy duty use with a higher maximum weight rating"....

So, it seems 15" wheels are still a "unicorn" and if the OP's drums are 5 lug, they'll be even more difficult to find......
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Old 07-05-2021, 07:42 AM   #10
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The Society of Automotive Engineers (SAE) is tasked with all wheel/rim certifications. It is often hard to get a specific answer from them as they will refer questions to the provider of wheel/tire assemblies, as those providers - retailers or vehicle builders - are responsible for the correct wheel/tire/rim sizes. That links all of us back the the vehicle owner's manual, where it says to get approval for wheel/tire size changes from the vehicle manufacturer.

The linkage of federal regulations/standards are from start to finish. Only the final product has all the information needed for it's use. Read the sidewalls, it's there. Wheels are not required to have specifications written on them, just their basic size such as; 15X6J. Wholesalers may request the wheel manufacturer to provide specifications for each wheels/rim built for them. Most of the OEM providers will have wheel/rims with specifications. Otherwise, get the part number from the wheel label and ask it's manufacturer. If they balk, remind them it's a NHTSA requirement for them to provide such information on demand from a consumer.
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Old 07-05-2021, 08:10 AM   #11
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The Sendel wheels have different part numbers. http://sendelwheel.com/wheels/t03sm.html

ITEM NUMBER DTC Article # SIZE BOLT CIRCLE OFF SET CENTER BORE LOAD RATING
T03-45545T 21707 14X5.5 5/4.50 +0 3.19 1900 @ 65 PSI
T03-56545T 21709 15x6 5/4.50 +0 3.19 2150 @ 80 PSI
T03-56655T-1+ 101077 15x6 6/5.5 +0 4.25 3200 @ 95 PSI
T03-66655T-1+ 101087 16x6 6/5.5 +0 4.25 3200 @ 80 PSI
T03-66866T 21714 16x6 8/6.5 +0 4.90 3580 @ 94 PSI
+ Airstream approved.
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Old 07-05-2021, 08:33 AM   #12
gwilkrrs
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trailer sticker says 225/75D/15D 65PSI factory

trailer had 225/75/15 trailer king 80PSI on it.


will be replacing all tires. may keep the new ones for spares, not sure.

looking at options now.
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Old 07-05-2021, 09:59 AM   #13
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Quote:
Originally Posted by gwilkrrs View Post
trailer sticker says 225/75D/15D 65PSI factory

trailer had 225/75/15 trailer king 80PSI on it.


will be replacing all tires. may keep the new ones for spares, not sure.

looking at options now.
The RVIA organization has a bulletin out recommending RV trailer manufacturers discontinue the use of bias ply tires an all RV trailers with 14" diameter wheels and above.

The ST225/75R15 LRE tires are acceptable options for the LRD. However, the wheels and valve stems need to be rated for the 80 PSI.

This is a tire size designation; ST225/75R15. This is a load range; LRE. The load range has no relationship with the tire designated size.

When President Trump threatened higher tariffs for off shore tire manufacturers if they didn't comply with standard DOT approved tire identifications. There was a scramble to comply. There are some acceptable options within the regulations. This first picture shows how that particular manufacturer molded size and speed rating on the sidewall.

Click image for larger version

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This picture shows how another manufacturer's method for displaying tire speed rating and load range.

Click image for larger version

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Old 07-05-2021, 10:21 AM   #14
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Quote:
Originally Posted by gwilkrrs View Post
trailer sticker says 225/75D/15D 65PSI factory

trailer had 225/75/15 trailer king 80PSI on it.


will be replacing all tires. may keep the new ones for spares, not sure.

looking at options now.
I have the Carlisle Radial Trail HD LRE , it had LRD.
No issues now.
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Old 07-06-2021, 07:58 AM   #15
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An after thought: Older rims/wheels may not be approved for use with radial tires. Consult the RV builder or the rim/wheel manufacturer for acceptable rims/wheels for a specific radial tire.
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Old 07-10-2021, 01:14 PM   #16
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So I bought 4 wheels and tires- just need to get them mounted and ballenced-
The existing wheels were only rated for 2000 and the tires are rated for 2830 so the new wheels are now rated for 2380.

I cribbed up the rv so I could pull all 4 wheels off and let the suspension sag unloaded to check it out-

On the driver side were the last 2 tires from when I bought it- 1 was flat across the tread and the other was very rounded across the tread and 4 inches taller-
Tread separation and so close to coming apart- crazy but glad that one didn’t come apart-
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Old 07-11-2021, 08:28 AM   #17
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Quote:
Originally Posted by gwilkrrs View Post
So I bought 4 wheels and tires- just need to get them mounted and ballenced-
The existing wheels were only rated for 2000 and the tires are rated for 2830 so the new wheels are now rated for 2380.

I cribbed up the rv so I could pull all 4 wheels off and let the suspension sag unloaded to check it out-

On the driver side were the last 2 tires from when I bought it- 1 was flat across the tread and the other was very rounded across the tread and 4 inches taller-
Tread separation and so close to coming apart- crazy but glad that one didn’t come apart-
I sure am glad you were able to find that before something bad happened. Safe travels!!
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Old 07-11-2021, 08:55 AM   #18
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An after thought: Older rims/wheels may not be approved for use with radial tires. Consult the RV builder or the rim/wheel manufacturer for acceptable rims/wheels for a specific radial tire.
Where do you come up with this stuff?
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Old 07-11-2021, 11:12 AM   #19
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Where do you come up with this stuff?
It's a paragraph from a USTMA wheel bulletin.

USTMA = U.S. Tire Manufactures Association. They provide tire standards in the USA.
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Old 07-11-2021, 01:31 PM   #20
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It's a paragraph from a USTMA wheel bulletin.

USTMA = U.S. Tire Manufactures Association. They provide tire standards in the USA.
Radial tires have been in the US for close to 60 years, I had them back in the 60’s no special wheels needed.
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