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SP2 Swing linkage geometry

Old 01-30-2011, 11:35 AM
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SP2 Swing linkage geometry

I wonder if anyone who has done this swap has tried other geometries than Tweety's 78-61-60mm?
When I mock up this geometry I get very short wheel travel and a hard stop.

For me it looks like 78-67-67 or similar will work better.

I plan to have the geometry of stock set up drawn in CAD and compare with the SP2 swing set up to get a table, matching wheel travel with shock travel, unless someone has already done that?

BTW what shock maximum travel should I calculate with for stock and a F4i shock?
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Old 02-13-2011, 10:33 AM
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Seems to be a more unique swap than I thought?
Anyhow, I measured the stock shock travel to 40mm and F4 to 36mm.
I am now riding with a 78-73-77 geometry. I have only done a short trip since the weather is not very appealing yet, but it feels like the character I was looking for.

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Old 02-14-2011, 03:50 AM
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Originally Posted by Bngt View Post
Seems to be a more unique swap than I thought?
Anyhow, I measured the stock shock travel to 40mm and F4 to 36mm.
I am now riding with a 78-73-77 geometry. I have only done a short trip since the weather is not very appealing yet, but it feels like the character I was looking for.

Bngt
Well, as far as I know, You and me are the only two rolling around with an stock SP2 swingarm as of now... Fire (Swedish Forum) is working on a swap with a SP1 arm, and will be out in a month or two... So for now it seems to be us Swede's leading the way...

There are other "working on it"... Some with stock SP1/SP2 arms, one with a custom welded shortened SP2 arm, and as far as I know, that's it...
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Old 02-17-2011, 02:27 PM
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I need to test it more before I can recommend it but I have high expectations. It felt like such a natural thing to do.
Thank you for the inspiration.
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Old 02-17-2011, 02:44 PM
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For what it's worth:

The stock RC51-SP2 rocker is 85-54-60 mm
The Moriwaki RC51 rocker is 79-59-55.5 mm

I do not know how the relationship between trailing link mounting point and swingarm pivot compares with the RC51 linkage. I made the measurements on the RC51 and posted them a while back:

https://www.superhawkforum.com/forum...ad.php?t=24322

Last edited by RCVTR; 02-17-2011 at 02:47 PM.
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Old 02-26-2011, 12:15 PM
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Great job you have done there RCVTR!
I wish it were for SuperHawk.
I intend to test a different measuring method, because I am lazy. I'll photograph the bike and then use the coordinates in the graphics program.
The CAD software I am using can simulate the movement and provide leverage data. I have at the moment no plan to alter rake or trail.

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