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View Poll Results: what do you think about my dh bike design
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Old 06-26-05, 06:15 AM   #1
dxc
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just tell anything to me....

Last edited by dxc; 07-25-05 at 06:27 AM.
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Old 06-26-05, 06:33 AM   #2
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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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Old 06-26-05, 06:53 AM   #3
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On the evolution it looks like the linkage will hit the shock. What am I missing on that?
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Old 06-26-05, 07:35 AM   #4
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I still dont like the foating BB........
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Old 06-26-05, 10:46 AM   #5
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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.
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Old 06-26-05, 12:10 PM   #6
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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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Old 06-26-05, 02:04 PM   #7
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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...
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Old 06-26-05, 02:50 PM   #8
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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.
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Old 06-26-05, 03:55 PM   #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
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Old 06-26-05, 10:02 PM   #10
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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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Old 06-27-05, 10:11 PM   #11
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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 06:28 AM.
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Old 06-27-05, 10:14 PM   #12
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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.
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Old 06-29-05, 12:28 AM   #13
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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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Old 06-29-05, 06:16 AM   #14
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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.
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Old 06-29-05, 06:29 AM   #15
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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.
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Old 06-29-05, 06:46 AM   #16
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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 .
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Old 06-29-05, 05:30 PM   #17
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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 !!!!
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Old 06-29-05, 07:32 PM   #18
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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.
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Old 06-29-05, 07:38 PM   #19
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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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Old 07-03-05, 04:53 AM   #20
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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
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Old 07-03-05, 10:34 AM   #21
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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.

Quote:
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 ...
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Old 07-17-05, 05:27 AM   #22
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Detailed in graphics format.
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Old 07-25-05, 06:31 AM   #23
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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 06:41 AM.
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Old 08-22-05, 11:21 PM   #24
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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 01:24 AM.
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Old 09-25-05, 03:24 AM   #25
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feel free to build from the design. i post a 3d view for the evolution-x
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