How does this tire and axle look? - Fiberglass RV


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Old 05-21-2016, 09:29 PM   #1
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How does this tire and axle look?

Trying to determine what's going on with our 1979 scamp; new to us this year. It needs new tires, but...does it need a new axle, or does it look like it's been replaced at some point? What could be causing this odd wear pattern?
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Old 05-21-2016, 09:31 PM   #2
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Hers the front
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Old 05-21-2016, 09:33 PM   #3
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The axle
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Old 05-21-2016, 09:34 PM   #4
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The tire. Thanks!
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Old 05-22-2016, 01:34 AM   #5
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Looks like a bent spindle is causing wear on the one side due to the tire being tipped over a bit.

I'd replace the axle. Consider the down angle if you want to use bigger tires.
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Old 05-22-2016, 05:50 AM   #6
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What is the born on date of the tires? What PSI does the tire say is the maximum PSI? What PSI is actually in the tire?
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Old 05-22-2016, 06:09 AM   #7
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According to the Dexter engineers “Dexter would consider any Torflex arm that has moved more than ten degrees from the original build angle as weak or losing suspension”. But how would you know if your axle has sagged 10° or more when you don’t know what the start angle was?

The first test is to jack up each side of the trailer and watch to see if the wheel moves down as weight is removed from that side, if on either side the wheel does not drop at least 1˝” the axle needs replacing. Second, measure the diameter of your tire (as an example ST175/80D13 trailer tires have a diameter of 24″) and divide this number by 2 (in this case 12″). Now with the trailer sitting on level ground measure the distance from the ground to the underside of the street side or drivers side frame rail as close to the axle as you can, either just ahead or behind the axle mounting brackets. Take the tire radius and subtract the frame to ground measurement, if the result is greater than 2˝” your axle needs replacing (the above calculations are based on a fully loaded axle with an initial start angle of 0° to 10° up angle). Boler Rubber Torsion Axle - Boler-Camping
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Old 05-28-2016, 02:34 PM   #8
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I am not familiar with the suspension on 13' Scamps, but I know they are built lower than the 16s so they can fit into some garages. That said, the suspension arm may not angle down as much as a 16' which is in the area of 22 degrees. Yours looks to be angling UP about 20 degrees. If your axle is original to the trailer I would recommend replacing it. You could have smoother ride and new brakes. I could not see the tire wear in your photos due to the washed out light. Continuous wear along the inside of the tire would indicate a de-cambered (bent) spindle. Scalloping tread wear would indicate lack of suspension travel (worn out elastic in axle) causing the trailer to bounce. A new axle would make her sweet. And perhaps a new paint job to match the bug in your driveway!
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Old 05-29-2016, 09:02 AM   #9
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Thanks! I was kind of hoping to just put new tires on an just kick the can 5 years down the road, but now I'm thinking I should take care of it.


If I go with 13" wheels again, but new 5 lug wheels, would my baby moons fin on them?

And how have people dealt with the spare tire not fitting on the mounts?
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Old 05-29-2016, 09:24 AM   #10
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Originally Posted by Zennifer View Post
...

And how have people dealt with the spare tire not fitting on the mounts?
Trunk of tug.
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Old 05-29-2016, 09:25 AM   #11
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Originally Posted by Ian G. View Post
According to the Dexter engineers “Dexter would consider any Torflex arm that has moved more than ten degrees from the original build angle as weak or losing suspension”. But how would you know if your axle has sagged 10° or more when you don’t know what the start angle was?

The first test is to jack up each side of the trailer and watch to see if the wheel moves down as weight is removed from that side, if on either side the wheel does not drop at least 1˝” the axle needs replacing. Second, measure the diameter of your tire (as an example ST175/80D13 trailer tires have a diameter of 24″) and divide this number by 2 (in this case 12″). Now with the trailer sitting on level ground measure the distance from the ground to the underside of the street side or drivers side frame rail as close to the axle as you can, either just ahead or behind the axle mounting brackets. Take the tire radius and subtract the frame to ground measurement, if the result is greater than 2˝” your axle needs replacing (the above calculations are based on a fully loaded axle with an initial start angle of 0° to 10° up angle). Boler Rubber Torsion Axle - Boler-Camping
Great info Ian! I want to raise the height of mine and thought about a leaf spring axle any thoughts on that?
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Old 05-29-2016, 09:29 AM   #12
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Originally Posted by gordon2 View Post
Trunk of tug.
Maybe...but it's a minivan and often packed to the gills anyway with two kids and a dog plus bikes and the stuff that doesn't fit in the camper! I'd love to figure a way to keep it on the rear of possible..
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Old 05-29-2016, 10:27 AM   #13
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Originally Posted by ruscal View Post
I am not familiar with the suspension on 13' Scamps, but I know they are built lower than the 16s so they can fit into some garages. That said, the suspension arm may not angle down as much as a 16' which is in the area of 22 degrees. Yours looks to be angling UP about 20 degrees. If your axle is original to the trailer I would recommend replacing it. You could have smoother ride and new brakes. I could not see the tire wear in your photos due to the washed out light. Continuous wear along the inside of the tire would indicate a de-cambered (bent) spindle. Scalloping tread wear would indicate lack of suspension travel (worn out elastic in axle) causing the trailer to bounce. A new axle would make her sweet. And perhaps a new paint job to match the bug in your driveway!
Up 22 dgrees is OEM on Scamp 13s. Negative camber is the result of rubber fatigue(normal wear over time). A spindle is much more likely to break than bend, and in the unlikely event it did bend,it wouldn't roll much more than out of sight.
The photos aren't clear but they don'tseem to show inside edge wear, but there might be wear on the second tread in from the outside which is common on straight axles with bias tires. plus the tires do appear to be superannuated and weather worn.
Better pictures please, but from what can be seen, I'd say new tires, then monitor tire wear over the next few years.
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Old 05-29-2016, 11:51 AM   #14
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New tires are DEFINITELY on the plans. TBH, I only trusted them the 7 miles from where I bought it to my house (I know-how lucky was THAT!) at slower speeds on the side roads. They look OLD and worn out.

Thanks for the look everyone-I still need to do Ian's test, too. and then weigh everything. And see if anyone can get us taken care of on a new axle before our first trip in 3 weeks. That may determine it...
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