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Post Number:#1  PostPosted: Tue Oct 09, 2012 8:23 pm
  

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I am planning to pull a trailer with my new 81 Interstate. I was wondering if torsion bars are enough superior to springs to justify the cost?

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Post Number:#2  PostPosted: Wed Oct 10, 2012 3:47 am
  

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I guess it depends on the use of the trailer and how much you intend to pull it. Personally, I can't justify the cost difference to myself although I hear they pull and handle nice.

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Post Number:#3  PostPosted: Wed Oct 10, 2012 7:10 am
  

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Location: Montana
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My Rides: 81 GL1100
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I might be looking at building something for my dog...Used to have a sidecar on my BMW and my dogs loved it.

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Post Number:#4  PostPosted: Wed Oct 10, 2012 7:57 pm
  

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I think the biggest advantage to torsion bars is not having the axle to work around.
You can use taller tires and still build the body slung down between the two still keeping the center of gravity down low.
Other wise you will need enough room between the body and axle for the suspension travel or a large hunp inside the trailor to clear the axle.
I am content with my sprung straight axle,but have always loved the look of the bushtecs.

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Post Number:#5  PostPosted: Thu Oct 11, 2012 9:35 am
  

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Tory hit on what I was gunna say....with a torsion bar, the actual trailer can be lower than with a spring suspension set-up.

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Post Number:#6  PostPosted: Fri Oct 12, 2012 7:48 pm
  

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AApple wrote:
Tory hit on what I was gunna say....with a torsion bar, the actual trailer can be lower than with a spring suspension set-up.


Thats exactly what I meant.
With the torsion bar suspension the trailor can use a tall tire with the body dropped low between them with out having an axle in the way.
Where as a straight axle trailor has to be high enough to allow suspension room between the axle and body.Imagine how tall a Harbor Freight trailor would be with a pair of 15 inch wheels on it.But a Bushtec or similer using torsion bars has the tall wheel and still keeps the body eight inchs or lower to the ground.

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1983 GL1100I
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1982 CB900F SuperSport
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Post Number:#7  PostPosted: Sat Oct 13, 2012 8:13 am
  

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Is there a shock absorber effect with the torsion bars that would make it bounce less than with springs?

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Post Number:#8  PostPosted: Sat Oct 13, 2012 2:11 pm
  

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Glenn406 wrote:
Is there a shock absorber effect with the torsion bars that would make it bounce less than with springs?

The rubber bushings needed to hold a torsion bar do act as a sort of shock absorber but don't really limit bounce like a shock absorber. Just an observation from having had an old car with torsion bars and worn out shocks.

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Post Number:#9  PostPosted: Thu Nov 22, 2012 5:02 am
  

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What I like about torsion bars is when you are going down the road and hit a chuck hole it don't jump all over the place. With an axel it will tellecope over to the other wheel and the trailor will jump all over the place. with the torsion bar it will just take the shock and keep on going. I love my trailor.

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Post Number:#10  PostPosted: Thu Nov 22, 2012 6:18 am
  

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Location: Montana
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80 BMW R100
73 CL350

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Anybody ever Build a trailer using motorcycle style shocks?

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Post Number:#11  PostPosted: Thu Jan 24, 2013 12:14 pm
  

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I've built a large trailer for a sail boat I inherited. The cost was a bit higher but the ride was 500% smoother. The axels act independantly from one another. Result no load transfer from one wheel to the other. On a bike during a sharp curve this also means no sudden jerk in the appex which can cause some nasty results. Then you have all the other bennifits everyone else have provided.

Bob the new guy in the sand box

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Post Number:#12  PostPosted: Thu Jan 24, 2013 1:37 pm
  

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My Rides: 1969 CT90
1970 CL450 Honda
1974 TY250 Yamaha
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My cyclemate trailer is a torsion bar suspension and it has been great to pull. I have never seen it do anything but follow quietly.
You can buy the torsion bar with stub axles at a trailer supply store.

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Amelia, Ohio
1969 CT90
1973 CT90
1970 CL450 Honda
1974 TY250 Yamaha
1977 CT90
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Post Number:#13  PostPosted: Thu Jan 24, 2013 4:47 pm
  

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Location: Kelowna, BC
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1980 Suzuki GS850L

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In Canada Princess auto carries them for the application we have been talking about.
Bob C

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