F650GS (single) Swing arm swap ideas

Discussion in 'Thumpers' started by Gangplank, Feb 26, 2013.

  1. Gangplank

    Gangplank Advenchaintourer

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    So reading through the F650GS fork swap thread... and after trading my F800GS for a F650GS and a bundle of cash I got to thinking...

    What is the chance that there is a swing arm out there that could replace the F650GS steel (read heavy Mo-Fo) swing arm with an aluminium swing arm off a dirt bile and then using either the Dakar shock or some other bike's shock as a replacement

    Ideas, thoughts, concepts....

    And don't tell me I'll shoot my eye out. It either can or can't be done. :freaky
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  2. Gangplank

    Gangplank Advenchaintourer

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    I'm planning to take the F650GS down to a buddy's shop and take some measurements. From there we'll figure out what older swing arm might fit and do some weighing.

    Thoughts on why and what - the stock F650GS is a fat biotch. You can lose some weight by taking off or swapping out some things.

    Front End Swap = ~15 lbs
    ABS Pump = 4-8 lbs
    Swap Exhaust = 6-8 lbs

    That is 25+ lbs right there. How much do ya think could be gained by this?
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  3. Aquatic

    Aquatic Long timer

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  4. Gangplank

    Gangplank Advenchaintourer

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    Well now that's cool!!

    [​IMG]

    Why do you have a CAD of the swingarm?

    Next step is to compare those measurements to various replacement options & especially ones that are readily available?

    And then its what shock would fit & have an 18" wheel built if needed.
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  5. TobyG

    TobyG be happy :)

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    You could always try and find one of the infamous Touratech aluminium swingarms. You know, the ones they offered to refund your money on if you sent them back, after they broke a couple in the Dakar 2002. They didn't sell many of those, in the first place.
    I am only aware of 5 of those still out there, so assume that there's a dozen or two of them still in existance.

    Not that you'll find one... :deal

    These are extremely light, however. And they look way cool.

    Other than that, you could contact a company building custom swingarms (Krueger and Junginger in example).
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  6. Aquatic

    Aquatic Long timer

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    For this very reason. Done a bit of research. You can cut the weight by roughly 30% if you build the exact same swing arm out of chromoly. The added strength means you can use a thinner section. But forming it is lot harder.
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  7. Gangplank

    Gangplank Advenchaintourer

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    I'm hoping to rind a replacement that I can use.

    The shock is going to be tricky but stranger things have fit other bikes in this world. Sportbikes do all sorts of swaps that work for race bikes, etc.


    From the Forks Conversion Thread:
    Hmmm... Seems the stock swing arm should weight more than 13 lbs no?
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  8. LoJack

    LoJack Long timer

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    I'm almost positive that's what it is. I remember thinking if I could find/build something that weighed 8 lbs I'd save 5 lbs. After a while, I decided it would be easier and cheaper to find something....

    I could be wrong on though because it was over about a year ago, but it's certainly no more than 15 lbs.
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  9. Gangplank

    Gangplank Advenchaintourer

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    Don't supposed anyone knows where to get the measurements for other swingarms?

    Looking at some from ATK?
    G650X Challenge?
    Any other suggestions
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  10. LoJack

    LoJack Long timer

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    I was contacting people that had stuff on ebay. Some never responded, but others were happy to send measurements.

    G650XChallenge swing arms have an asymmetrical pivot. The left side is outside the frame. Maybe it'll work, but I don't know.
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  11. Gangplank

    Gangplank Advenchaintourer

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    I asked someone on Fleabay and the stock unit weighs 15.85 lbs so about 16. Wonder what a regular dirtbike swingarm weights?
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  12. TobyG

    TobyG be happy :)

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    No idea, however, the Touratech Aluminium one weighs 8.8 pounds. The front part is cast aluminium, the rear part is aluminium profiles.
    The reason they made this swingarm in the first place is, aside from saving weight, having full chain adjustability using an 18" rear and gaining 30 additional mm of rear travel (280 mm, you could only get 250 with the stock swingarm).

    [​IMG]


    [​IMG]


    [​IMG]
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  13. Aquatic

    Aquatic Long timer

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    Do you have that as a 3D model or only pictures?
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  14. LoJack

    LoJack Long timer

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    Gotcha, :thumb
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  15. TobyG

    TobyG be happy :)

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    I only got those 3 rendered files and real-life pictures.
    If you want to see anything in particular, I can check if I got a pic or I can take one the next time I get a chance.
    #15