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Old 09-12-2014, 05:42 PM   #1
brokent10 OP
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What happens if?

I want to build an adventure hack much in the theme of Shaun's (Get Back) DRZ400. I have a question about the swing arm set up. Everyone I have seen has built using a conventional style swing arm but what if I built one using the A-arms off an ATV? They would be mounted just like on an ATV giving the hack wheel up and down movement. They are already set up to provide castor and camber quite easily.

I ask this because I have been thinking about it for a long time and I want some serious answers on why or why not this would work.

Thanks
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Old 09-12-2014, 08:22 PM   #2
Crilly
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It would work, but would be a lot wider.
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Old 09-13-2014, 06:09 AM   #3
Brendan J
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Interesting idea ! I didn't think of doing that for sidecar suspension. I might have to see if I can incorporate that into my build. Sorry if I'm pinching your idea, but it gives me another angle I hadn't thought of.
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Old 09-13-2014, 11:23 AM   #4
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wider...

Either your side car would be a lot wider, or the suspension would intrude into the passenger space.
Neither is especially good.
If you want to use car type suspension, try a VW beetle links-and-torsion bar, or a Morgan sliding pillar type. Both of those would make a narrower outfit, especially the Morgan type.
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Old 09-13-2014, 01:25 PM   #5
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"A drawback of the sliding pillar system is that the track changes with suspension movement, particularly where the track is narrow (as for cyclecars) in relation to suspension travel...[thereby increasing] tyre scrub."
http://en.wikipedia.org/wiki/Sliding_pillar_suspension

Not sure I understand that, but I found it on the internet!
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Old 09-13-2014, 01:26 PM   #6
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The rig would not have to be wider if it had raised adventure seating instead of tub.
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Old 09-13-2014, 06:16 PM   #7
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I'm not looking to carry a passenger just haul around camping gear and whatever else I need for extended adventuring off the beaten path. I like the idea of using it as a high clearance set up to match what the bike would have since I have been looking at using a KTM 530 or similar.
The A-arms wouldn't necessarily make the hack wider if they were incorporated into the build. I don't think it would take up anymore room than a normal swing arm as far as capacity.
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Old 09-13-2014, 06:18 PM   #8
brokent10 OP
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Quote:
Originally Posted by Brendan J View Post
Interesting idea ! I didn't think of doing that for sidecar suspension. I might have to see if I can incorporate that into my build. Sorry if I'm pinching your idea, but it gives me another angle I hadn't thought of.
I'd like to see pics if you do incorporate it!
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Old 09-14-2014, 02:07 AM   #9
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I don't have a photo with the sidecar body off the frame, but our former EML GT2001 sidecar had a "swingarm" that pivoted on the inner sidecar frame and extended under the sidecar, past the outer frame to the hub where is was suspended by a heavy spring. Think of it kinda like a one-sided "twin I-beam" formerly used by Ford pickups. Maybe someone has a photo of this sidecar frame with the body removed.

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Old 09-14-2014, 06:05 AM   #10
bk brkr baker
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Here's a "Twin I Beam" style suspension for the chair made by Twistgrip for his GoldWing based outfit. He uses the shock and linkage from an SV 650.
Nice work !

If you go the ATV a-arms route, have you considered using them for the bikes front suspension as well ?
It could then incorporate two wheel steering.
Just to complicate things a little more.
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Old 09-15-2014, 07:17 PM   #11
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Lee J, that may

be true, but I was thinking of a road outfit with only a few inches of travel. I suppose with the high clearance long-travel sidecars popular today, that would be a factor.
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