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Old 12-26-2007, 11:45 AM   #1
Robb OP
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homebuilt sidecar frame?

Anyone here built their own frame? I'm itching to find a donor bike & try, then cobble together a rudimentary body for it. The goal is a 400cc to 750cc motorbike, low-speed usage (around town, picking up my daughter from school occasionally, probably won't see the far side of 50mph at any point).

I've got a couple frames sketched out, I'm just looking for general advice in a few areas, such as

a) recommended tubing size and wall thickness - I tend to overbuild, but obviously would like to keep weight down as well

b) any tips re: placement of lugs on the bike frame ... psychologically I'd like to keep two mounts "inline" at the bottom of the frame, and run the other two up at an angle, to forward of the motor and rearward of the seat ... for that matter,

c) should I be thinking "heim joints at the strut/bike connection as well as the strut/hack connection", or "heim joints at the strut/bike, and solid welds at the strut/hack"?

Figuring on using a standard motorcycle swingarm for the third wheel, shock(s) mounted horizontally from the shock mount on top of the swingarm to the frame ...

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Old 12-26-2007, 01:23 PM   #2
Andy-Gadget
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Only way to go.
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Old 12-26-2007, 01:30 PM   #3
onaXR
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I am getting ready to do the same thing. XR650L planning on a rectangular hoop under engine, front motor mount bar to car, rear foot peg area to car. Keep me posted on yours. I'm doing a trials looking car with just a box/seat and grab rail, but using a swingarm and 18in rear from a XT Yamaha.
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Old 12-26-2007, 01:55 PM   #4
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Mounting a chair frame to the bike you will want all attachment points to be solid but adjustable. There is a lot tuning to be done to get the rig set up correctly. All angle of lean and toe in must be done between the chair frame and the bike frame thus at the attachment points.
The rule of thumb I always used was 1 degree lean of bike toward the chair, and 1 degree of toe in. was a good place to start.
Is there any other ideas on better ways to start setting one up ??????

Also has any one used a "rubber axle" for a sidecar suspension.
What I mean is a torsion tube, where one square tube in inside another separated by rubber, with the swingarm on the inner tube and the rubber acting as the spring. If any one is doing this or has what was used as donor parts?
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Old 12-26-2007, 01:57 PM   #5
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Andy, how about some shots of her sitting level? Interesting looking car you got there. I tried looking through your Smug but you got a zillion pix on there
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USMCG_Spyder screwed with this post 12-26-2007 at 02:04 PM
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Old 12-26-2007, 02:52 PM   #6
Andy-Gadget
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Not mine anymore.

Current project (embrionic) is a sidecar wheel drive outfit, still aquiring the bits, no photos yet as nothing is built yet.
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Old 12-26-2007, 08:03 PM   #7
RedMenace
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Quote:
Originally Posted by hairsmith
Mounting a chair frame to the bike you will want all attachment points to be solid but adjustable. There is a lot tuning to be done to get the rig set up correctly. All angle of lean and toe in must be done between the chair frame and the bike frame thus at the attachment points.
The rule of thumb I always used was 1 degree lean of bike toward the chair, and 1 degree of toe in. was a good place to start.
Is there any other ideas on better ways to start setting one up ??????

Also has any one used a "rubber axle" for a sidecar suspension.
What I mean is a torsion tube, where one square tube in inside another separated by rubber, with the swingarm on the inner tube and the rubber acting as the spring. If any one is doing this or has what was used as donor parts?
Most people lean the bike AWAY from the chair. I used a trailer torsion axle for one of rigs I built. THis article will give you a good general idea of what I did when I put four rigs together for my classes. Pretty standard stuff.
http://adventuresidecar.com/ASSFLEET..._the_fleet.htm
You can get the slip joints, heims, struts and other mounting hardware from most sidecar riggers, including Dauntless Motors, Side Strider and Claude who posts here.

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Old 12-26-2007, 08:15 PM   #8
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Quote:
Originally Posted by RedMenace
Most people lean the bike AWAY from the chair. I used a trailer torsion axle for one of rigs I built. THis article will give you a good general idea of what I did when I put four rigs together for my classes. Pretty standard stuff.
[IMG]http://adventuresidecar.com/ASSFLEET..._the_fleet.htm[/IMG]
You can get the slip joints, heims, struts and other mounting hardware from most sidecar riggers, including Dauntless Motors, Side Strider and Claude who posts here.
Glad you caught that ! "Excuse" that was 20 years ago I set up my last one.
And if I would have taken half a min to think about what I was typing I might have bin smart enough to catch it.
How do you feel about the torsion axle on the one you built?
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Old 12-26-2007, 11:29 PM   #9
RedMenace
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Quote:
Originally Posted by hairsmith
How do you feel about the torsion axle on the one you built?
It's OK. Cheap and easy. I used one from a 1000# set and it seems about right for the lightweight hack on a KLR.

The assembly is pretty heavy.Which isn't entirely a bad thing as the weight is exactly where you would want it for effective ballast( the same is true for using heavy pieces for the chassis-it is an easy way to build it strong and the weight down low works for you).

Jay was using some with a splined arm which allowed him to adjust the axle height. That would be a real improvement over what I used, but I don't know where he got them.

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Old 12-27-2007, 03:12 AM   #10
TouringDave
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Andy, interesting front end on the GS, any more pics of the body?
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Old 12-27-2007, 06:32 AM   #11
Robb OP
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Great info here .. .a couple of those pics are more descriptive than anything I've found Googling!
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Old 12-27-2007, 09:36 AM   #12
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What's going on with that front end? What is that and why?


Forgot who asked, but Steib used to hang the body from big rubber bands/donuts. Worked well until the rubber rotted.
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Old 12-27-2007, 10:01 AM   #13
Robb OP
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I wondered the same thing .. I'm guessing the loop is there to prevent the tire from contacting and grabbing the side of the car during a sharp left-hand turn, izzat correct?
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Old 12-27-2007, 10:01 AM   #14
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Oops .. left-hand turn, I meant.
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Old 12-27-2007, 02:06 PM   #15
RedMenace
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Looks like he just moved the axle forward to reduce trail and thus reduce steering effort. I'd guess he made the axle carrier a big U to help brace the front end to deal with sideloads and twisting. Looks like the tub may be mounted to the chassis with rubber bushings. Stout, simple easy to build- nice overall design!

I wonder how the toe in is set? Dont see any lateral adjustment in the lower mounts?
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