View Poll Results: what do you think about my dh bike design
Voters: 23. You may not vote on this poll
My DH bike design
#2
Ride bike or bike ride?
Join Date: Oct 2003
Location: Adelaide, Australia
Posts: 1,447
Bikes: MongoosePro DH, Dart custom road bike, .243 Racing FR street bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
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.
#3
Old School Rad
Join Date: Sep 2004
Location: The old Mountains
Posts: 8,206
Bikes: Blur LT
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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......
Like a circus monkey on a stolen Harley......
#5
Senior Member
Join Date: Mar 2005
Location: Philadelphia
Posts: 1,036
Bikes: Specialized AWOL, Soma Juice
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
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
Giggity giggity!
Join Date: Nov 2004
Location: Danville, Ca
Posts: 1,800
Bikes: Yeti DJ Custom build. X.9, Marzocchi, RaceFace, Gamut, DT, Truvativ, Michelin, Hope.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
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.
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.
#7
The geek on two wheels.
Join Date: Jun 2005
Location: Christchurch, New Zealand.
Posts: 70
Bikes: '06 Giant STP1 coming on its way.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Originally Posted by Dirtbike
What does the axle path look like?
I reckon the center of mass should be a bit lower...
#9
Local Genius
Join Date: Jun 2004
Posts: 618
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
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.
#10
your stupid
Join Date: Jun 2005
Location: North Vancouver, BC
Posts: 27
Bikes: '05 demo 8, .243 4130, santa cruz super 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
now dont you ever wonder why bike designers are paid so much?
i will leave it at that
i will leave it at that
#11
Member
Thread Starter
Join Date: May 2005
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
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.
#12
Giggity giggity!
Join Date: Nov 2004
Location: Danville, Ca
Posts: 1,800
Bikes: Yeti DJ Custom build. X.9, Marzocchi, RaceFace, Gamut, DT, Truvativ, Michelin, Hope.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
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.
#13
biketilldeath
Join Date: Dec 2004
Location: now residing in kamloops
Posts: 498
Bikes: 2005 Norco Aline:D
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
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.
#14
Dismember
Join Date: Feb 2005
Location: Western Australia
Posts: 695
Bikes: Kona Kikapu/hoss deluxe mix, 1950's Malvern Star gent 28" turned into a stealth commuter with drums and a three speed.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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
Dismember
Join Date: Feb 2005
Location: Western Australia
Posts: 695
Bikes: Kona Kikapu/hoss deluxe mix, 1950's Malvern Star gent 28" turned into a stealth commuter with drums and a three speed.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
One other thing, there's a well known principle of engineering. Its called the K.I.S.S. principle. Keep It Simple Stupid.
#16
Member
Thread Starter
Join Date: May 2005
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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 .
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
THIS BIKE'S 4 U !!!!
Join Date: Sep 2004
Location: Western, NC .... (Pisgah, Bent Creek, DuPont)
Posts: 1,272
Bikes: HARO Xtreme X2, K2 Lithium 3.0, K2 Beast, K2 Flyin' Monkey, DiamondBack Accent EX, DiamondBack Axis TR
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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 !!!!
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
Dismember
Join Date: Feb 2005
Location: Western Australia
Posts: 695
Bikes: Kona Kikapu/hoss deluxe mix, 1950's Malvern Star gent 28" turned into a stealth commuter with drums and a three speed.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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
Still kicking.
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.
Rethink the design of the first one and you will have a nice DH/FR bike.
__________________
Appreciate the old bikes more than the new.
Appreciate the old bikes more than the new.
#20
Member
Thread Starter
Join Date: May 2005
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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 https://www.extra.hu/linkage/linkage2.exe
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 https://www.extra.hu/linkage/linkage2.exe
#21
Wood Licker
Join Date: Apr 2002
Location: Whistler,BC
Posts: 16,966
Bikes: Trek Fuel EX 8 27.5 +, 2002 Transition Dirtbag, Kona Roast 2002
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by willett
now dont you ever wonder why bike designers are paid so much?
i will leave it at that
i will leave it at that
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
Keep it up, looks like a good design but it isn't for me ...
#24
Member
Thread Starter
Join Date: May 2005
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i have new design posted, see it at https://www.bikeforums.net/mountain-biking/132675-my-other-dh-bike-design.html
Last edited by dxc; 08-27-05 at 01:24 AM.