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PostPosted: December 20, 2010, 6:23 am 
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Joined: December 20, 2010, 6:07 am
Posts: 2
Motorcycle rear shock with the eyelet on the shaft end threaded off:
Image
Can I build a thread-on end that mounts like a MacPherson strut would?

The application at hand has limited vertical space. I intended on using Rabbit strut cartridges and coilover sleeves:
Image
But even they are a bit longer than I hoped, and I still need to build the part that mounts to the spindle.

Instead of having to shorten the Rabbit strut cartdridges, I would like to use the motorcycle shock but am uncertain if a shock can handle the same loads that a strut would take. Also, I've never handled a motorcycle rear shock; are they of a significant enough diameter to compare to standard strut as far as lateral loads are concerned?


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PostPosted: December 20, 2010, 9:40 am 
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Joined: November 25, 2009, 8:47 am
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Location: Tecumseh, Ontario Canada
I don't think the cycle shocks could withstand the side loading a Mac Strut sees and would wear pretty quick.

Cheers, Ted


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PostPosted: December 20, 2010, 10:45 am 
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Joined: April 23, 2006, 8:26 pm
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Location: SoCal
Unless someone's already tried it and proven it lasts, I think the only real answer is "no one knows." The side-loading issue is a big deal, not just the bending on the shock tube, but also the shock absorber shaft bearing which was never designed to deal with those loads.

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PostPosted: December 20, 2010, 11:56 pm 
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Joined: July 28, 2009, 9:05 am
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Location: Buffalo, NY USA
maybe a good one, maybe... that particular cheap OEM pos? neg.


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PostPosted: December 21, 2010, 1:08 am 
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Quite a few people that I talked to today on an application specific forum said that shocks can't handle the sideforce and mentioned aluminum vs SS parts, but haven't seen any hard evidence, though I believe it.
I was considering something nicer than the disassembled unit, but still OEM (Monster, R6, GSXR); however if the shock can't handle the side force, it doesn't matter. This morning, I looked at a couple ATVs and Snowmobile and their shocks were far too small for my application (14mm shaft vs a Rabbit's 19mm), but suggested to me was front ATV struts as they are just a small MacPherson strut. I'll be looking into this.


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PostPosted: December 22, 2010, 5:27 am 
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Joined: November 12, 2008, 6:29 am
Posts: 3560
A shocks side force is higher than people imagine and a struts is lower than people imagine - does that help?

Compare the shaft, piston and bush size is the only way to determine what they can stand, it's not a given either.

You would be better considering adapting bike front forks maybe.


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