Scamp 13" tires - Page 2 - Fiberglass RV


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Old 08-10-2015, 11:23 PM   #15
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I personally would not tow my trailer with miss matched tires or any that I did not know for sure were less than five years of age. Looking at them tells you nothing. RV tires tend to degrade from the inside out. Due to the weight of your trailer you probable should be inflating to max inflation rate as stated on the tire.

Have you taken off the wheel bearings and check to make sure the uneven wear is not due to a bad bearing? When when you stop for gas or what ever have you put your hand near the hub to feel for heat? Have the tires been balanced?

The Trailer Weights in The Real World Thread will give you a ball park weight expectation number. I know on my own trailer due to configuration that one side does weigh more than the other by about 75lbs and due to its configuration is hard to get a perfect side to side balance.

Keep in mind when looking at tires that you need to be aware of what the max pressure the rims are rated for - if you find a higher rated tire you may find that your rims are not rated for its max rating.
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Old 08-11-2015, 12:38 AM   #16
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OK Carol, you've mentioned something I've never heard of....a rim pressure rated? I can't see how any rim made in the last 50 years or more would be compromised by high pressure before the tire would blow out first. Now the old split truck rims, they were killers for sure with over filling.
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Old 08-11-2015, 10:15 AM   #17
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Originally Posted by Borrego Dave View Post
OK Carol, you've mentioned something I've never heard of....a rim pressure rated?
Sorry to say it but its VERY true. RIMS have a pressure rating even shiny new ones!

I know more than a few people here who have looked into it & have found its actually hard to find a higher load rated tire to fit the stock 16' Scamp that the rims pressure rated can handle.

Some wheels/rims are actually stamped with the load/pressure rating some are not so you would have to contact the trailer manufacture to find out what rims they had on the trailer.
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Old 08-11-2015, 10:25 AM   #18
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Dave go trailer-wheels.com and click on the photos of rims and you will see that each of them has a PSI rating.
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Old 08-11-2015, 10:38 AM   #19
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It looks like the good news is that most seem to be rated to 50 PSI or Load Range "C" which includes almost all ST tires (I think?).


Which begs the question of what to do if here is no Maximum PSI stamp.
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Old 08-11-2015, 10:53 AM   #20
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I have never weighed my trailer from side to side but with both tires equally inflated to 50 lbs the length of tire patch, with tire on a 2x6, is the same within a 1/4 of an inch. Suggesting there is nearly the same load on each tire.

For reference my 1991 Scamp 16 with side bath has an axle weight of 2400 lbs with 200 lbs on the tongue. We use 13" Goodyear Marathons ST185/80R13s each rated for 1480 lbs at 50 PSI. We have never had a Marathon failure in our extended travels.
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Old 08-11-2015, 11:16 AM   #21
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Quote:
Originally Posted by cmartin748 View Post
I got mine weighed at the local land fill for free. It came it at 3000# on the nose. That was unhooked from the TV. Holding tanks were full.
You can also get it weighed at truck stops for a fee such as Pilot ir T&A.
Some states will do it at weigh stations for free but suggest you call first.
My stock 13" Sccamp wheels are rated @ 1344 lbs each. The tires are 1360 lbs.
I need to weigh the tongue so that I can subtract that from the total. when I run dry I should be within the weight limits. I have had the tires wear, on other trailers, on the inside tread when overloaded but never had any chunks come out. hehe
We never travel anywhere except to the nearest dumpstation with full tanks. All tanks full will add 360 pounds of liquid to your trailer (420pounds if you believe the stated gray tank capacity). You also illustrate the importance of choosing light gear and supplies. Daily shopping en route and/or as close to the destination as practical can save quite a lot on what you lug around.
It would be interesting to empty all your tanks take all supplies clothing etc. out and reweigh your trailer.
This would give you a base from which to work and give you a chance to evaluate what you really need to carry with you.
When we were newbies we carried three times as many "necessary" items as we do now in our TV and trailer combined.

If you empty just the gray and blackwater tanks you would reduce overall weight by 216 pounds(or 280). You have a minimum of 300 pounds on the tongue so you are now under 2500 on the axle and that's before you jettison those decorative concrete lawn ornaments.
Of course the other two water tanks could reduce the weight by up to another140 pounds.

With 2400 pounds on your axle you would have 320pounds of margin on your 13" tires fully inflated. Switching to 14" tires would be a way with very few changes in loading habits to get a comfortable margin equivalent to what you now have on your axle rating.
It is unlikely that the tread separation was directly related to overloading.
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Old 08-11-2015, 11:49 AM   #22
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We had tread come off a trailer tire the day we bought it while towing it home. A chunk of tread just came off like it was a semi retread. The tires were just really old. Of course we replaced all the tires as soon as possible.

Like Floyd we don't travel with full gray or black tanks. We do carry a half tank of water. We do minimize tongue weight and have just one propane tank, more than enough for us.
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Old 08-12-2015, 02:00 AM   #23
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Originally Posted by Bob Miller View Post
It looks like the good news is that most seem to be rated to 50 PSI or Load Range "C" which includes almost all ST tires (I think?).


Which begs the question of what to do if here is no Maximum PSI stamp.
Your best to assume they are rated at no more than 50 PSI as I have found its hard to find rims in the smaller sizes which are rated higher than that.

Your pretty well out of luck using a D rated tire on a standard Scamp rim which makes me wonder when people say they are changing to a D rated tire on their Scamps what rims they have or if they are even aware that the rims do have a PSI rating.
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Old 08-12-2015, 07:51 PM   #24
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Thanks to everyone for your input. I did find a local site to weigh our Scamp to include total, tongue and each side. Plan to get that done as soon as we get our axle reinforced to comply with the safety alert of several years ago. I found the weigh site by calling a local moving company we had used. Turns out they weigh their trucks at a local rancher's feed supply. Called them and they said I could come by anytime to weigh the Scamp for a $10 fee. Sounds good to me!

As to the age of the tires, all tires are required to have the date of manufacture stamped on them. I don't recall full detail, but I know two digits are month and two are year, e.g., 1113 would be a November 2013 manufacture date. There may be additional digits in the code. I'll look it up later. Problem is that that number sequence is small and often on the side of the tire underneath the trailer or TV.

I recently had a shop inspect and repack bearings. As I suspected by brief visual, PO was overzealous with grease to point of overflow to brakes, thus eliminating any stopping power. And yes, I now check bearing heat at fuel stops. All good so far.

I will be getting 3 new matching tires for next season. Still leaning to D rated tires and wheels. Probably doing no more than 150 more tow miles this year.

Thanks again for all your contributions!
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Old 08-12-2015, 08:00 PM   #25
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Sounds good, but I think that tire dates are by week and year so 1113 would be sometime in March, 2013 Guess what trouble your would be in when you got to 2613
Here's a good link on that:
http://www.tirerack.com/tires/tirete...150813005823:s
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Old 08-12-2015, 08:03 PM   #26
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Originally Posted by honda03842 View Post
I have never weighed my trailer from side to side but with both tires equally inflated to 50 lbs the length of tire patch, with tire on a 2x6, is the same within a 1/4 of an inch. Suggesting there is nearly the same load on each tire.

For reference my 1991 Scamp 16 with side bath has an axle weight of 2400 lbs with 200 lbs on the tongue. We use 13" Goodyear Marathons ST185/80R13s each rated for 1480 lbs at 50 PSI. We have never had a Marathon failure in our extended travels.
Norm & Ginny,

I just noticed you are running 185 80 R13 tires. Our 2005 came with 175 80 R13. Does the 185 fit ok in your 1991? Was that the original size or did you upsize?
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Old 08-12-2015, 08:06 PM   #27
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Originally Posted by Bob Miller View Post
Sounds good, but I think that tire dates are by week and year so 1113 would be sometime in March, 2013 Guess what trouble your would be in when you got to 2613
Here's a good link on that:
http://www.tirerack.com/tires/tirete...150813005823:s
Thanks for saving me some time and getting full info, Bob!
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Old 08-12-2015, 08:20 PM   #28
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Norm & Ginny,

I just noticed you are running 185 80 R13 tires. Our 2005 came with 175 80 R13. Does the 185 fit ok in your 1991? Was that the original size or did you upsize?
The are the largest Goodyear Marathons in 13 inch. The trailer came with junk tires that we replaced as soon as possible. I don't recall the exact size.

I had always planned to go to 14 inch tires but the 13s have worked fine so far. The 185s fit with room to spare.
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