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View Poll Results: what do you think about my dh bike design

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  1. #1
    dxc
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    just tell anything to me....
    Last edited by dxc; 07-25-05 at 07:27 AM.

  2. #2
    Ride bike or bike ride? Hopper's Avatar
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    For first:

    Hmmm, with a little tweaking you could possibly get a better rear end. From the looks of it it looks to be a short stroke length shock. Also what sort of numbers are you thinking the rear end will push out and what kind of axel path.

    Can't really be bothered analysing them properly sorry.
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  3. #3
    Old School Rad mtnbiker66's Avatar
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    On the evolution it looks like the linkage will hit the shock. What am I missing on that?
    Like a circus monkey on a stolen Harley......

  4. #4
    Local Genius
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    I still dont like the foating BB........

  5. #5
    Senior Member alcahueteria's Avatar
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    On the evolution it appears there is extra linkage near the top of the shock, is all that actually necessary?

    On the evolution-x, it just doens't look like it will always compress the way you have it pictured. What's to stop it from just pivoting on the chainstay/bb pivot and essentionally pulling on the shock? It seems to me that those two bottom bracket pivots would need to be farther apart horizontally to ensure that doesn't happen.

  6. #6
    Giggity giggity! Dirtbike's Avatar
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    What does the axle path look like? Placing the shock in the front triangle would make more sense because it is easier to adjust/tune there.

    The thing I dont like about the design is the floating BB. Say you are landing a jump. The Pedals move with the suspension and the shock is absorbed for the frame, but not the pedals. You would have to be sitting on the saddle for the suspension to absorb the shock for you. It kindof hard to explain but maybe someone understands.
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  7. #7
    The geek on two wheels.
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    Quote Originally Posted by Dirtbike
    What does the axle path look like?
    Looks like it would be vertical to me.

    I reckon the center of mass should be a bit lower...

  8. #8
    Senior Member matheprat's Avatar
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    It looks like a lot of pivot points. And would the saddle hit the rear tyre on full compression? Looks good though, I'm impressed.

  9. #9
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    Quote Originally Posted by Dirtbike
    What does the axle path look like? Placing the shock in the front triangle would make more sense because it is easier to adjust/tune there.

    The thing I dont like about the design is the floating BB. Say you are landing a jump. The Pedals move with the suspension and the shock is absorbed for the frame, but not the pedals. You would have to be sitting on the saddle for the suspension to absorb the shock for you. It kindof hard to explain but maybe someone understands.
    YEP its called chain suck and it Sux0Rs

  10. #10
    your stupid willett's Avatar
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    now dont you ever wonder why bike designers are paid so much?

    i will leave it at that
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  11. #11
    dxc
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    Here is the picture of the travel path, about the short travel shocks its true, the evolution using 70mm shock with 35mm travel, and the evolution-x using 200mm shocks with 60mm travel to get 250mm rear travel, about the floating bb, what can i say, i just try to minimize the chain growth with the system.
    The extra linkage for the shocks at the evolution, with that i can use short travel shocks to get long travel rear wheel.
    Last edited by dxc; 07-25-05 at 07:28 AM.

  12. #12
    Giggity giggity! Dirtbike's Avatar
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    The travel path looks great. It must be super plush and rolls fast over bumps. The ONLY thing I dont like is the Floating BB. Otherwise the linkage is great.
    Rides: 06 Demo8 II, Yeti DJ
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  13. #13
    biketilldeath snoopz666's Avatar
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    wouldnt the leverage ratio be huge with a short travel shock and 250mm of travel ?
    and with the evolution it really looks like it would pull on the shock if hit the right way...

    look like good desings but need a little work, keep goin you got a good start.
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  14. #14
    Dismember harov3's Avatar
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    I think you are asking your bike for another 400mm of chain at full compression. I would say you wont have that to spare and you wont get full suspension travel and/or you will snap chains or wreck your dropouts, derailuers ect. But its a fine attempt and worth persisting with, no design is right the first time. They all need to be drawn, studied, redrawn, built, tested, modified and tested some more before they are right. More power to you for giving it a go.

  15. #15
    Dismember harov3's Avatar
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    One other thing, there's a well known principle of engineering. Its called the K.I.S.S. principle. Keep It Simple Stupid.

  16. #16
    dxc
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    Actualy, i don't have resources to build the prototype, so i can't test the design, i agree with the KISS principle too, but i try to get inovative with my design. I will be happy if any body out there want to bulid one, it's free to copy, distribute, modified, with the source offcourse .

    Any body out there have idea how to replace the floating BB to minimize the chain growth? Actualy i don't like floating BB too, but i don't get another simple and reasonable way to minimize the chain growth that come with the system .

  17. #17
    THIS BIKE'S 4 U !!!! Killer B's Avatar
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    My Deepest Apologies Man....

    I see waaaay too many prints everyday @ work ..... I can't even look at another one.

    Looks good @ at glance anyway.

    Go for it if it feels right !!!!

  18. #18
    Dismember harov3's Avatar
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    I'd love to take it up but Iv'e got a shed full of projects already plus my last semester at Uni and the ongoing house restoration. If I start anymore projects my wife will kick me out so I'd need to be able to sleep under it. Keep at it, refine the concept and get a copy of mechanical desktop to help you refine it. Somebody will take you up on it.

  19. #19
    To be continued Dannihilator's Avatar
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    Going to call the second one The Tuesday since it involves the DW link?

    Rethink the design of the first one and you will have a nice DH/FR bike.
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  20. #20
    dxc
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    Thank's for everybody attention, here in the attachement i include drawing exchange dxg formatted cad file of the design in the zip archieves file, everybody ideas is welcome, you can edit and modify the design because of every body ideas is welcome.

    You can see the movement, but not the chain growth, with the programs linkage, by opening the LTX file in the zip archives files with the programs. downloat it at http://www.extra.hu/linkage/linkage2.exe

  21. #21
    Wood Licker Maelstrom's Avatar
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    Quote Originally Posted by willett
    now dont you ever wonder why bike designers are paid so much?

    i will leave it at that
    No I don't I sort of know 2. And the work they put in is incredible and requires some very specific skills.

    Any body out there have idea how to replace the floating BB to minimize the chain growth? Actualy i don't like floating BB too, but i don't get another simple and reasonable way to minimize the chain growth that come with the system
    There really isn't much. But a couple of companies have thought of using this type of idea and most people just aren't excepting.

    Keep it up, looks like a good design but it isn't for me ...

  22. #22
    dxc
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    Detailed in graphics format.

  23. #23
    dxc
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    Just came out with this concept to replace the floating BB on the Evolution-X
    Last edited by dxc; 07-29-05 at 07:41 AM.

  24. #24
    dxc
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    i have new design posted, see it at My other dh bike design
    Last edited by dxc; 08-27-05 at 02:24 AM.

  25. #25
    dxc
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    feel free to build from the design. i post a 3d view for the evolution-x

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