User Tag List

Page 1 of 2 12 LastLast
Results 1 to 20 of 37

Thread: The death of the derailleur?

  1. #1
    Join Date
    Oct 2012
    Posts
    7,678
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default The death of the derailleur?

    Ceramic Speed driven shifting system]Vital MTB

    We could make some stronger wheels with a single pignon disc at the back. On the other hand I wonder why they don't put the shifting mecanism in the crank area to put all the weight at the center. Especially on the suspension bike.
    Last edited by sk_tle; 09-04-2019 at 06:35 AM.
    --
    T h o m a s

  2. #2
    Join Date
    Jun 2008
    Location
    Laahndan town
    Posts
    2,329
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Till I see it ridden or hear of it ridden, it’s nothing but a concept.

    ....getting a lot of attention though, but maybe that’s the intention.
    Real World persona : Andy Corso

  3. #3
    Join Date
    Oct 2012
    Posts
    7,678
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Right now it probably works but with barely any load. They didn't mount pedals on the show bike how convenient :-)
    Last edited by sk_tle; 09-04-2019 at 07:52 AM.
    --
    T h o m a s

  4. #4
    Join Date
    May 2008
    Location
    DC
    Posts
    24,798
    Post Thanks / Like
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Is this old'ish news?

  5. #5
    Join Date
    Oct 2012
    Posts
    7,678
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Not really, they had already presented a shaft design last year but at eurobike they showed prototypes of a gear changing one that supposedly works. No footage of a anyone riding such a bike. I guess with only a minimum of lateral flex that thing may just fail to work.
    Last edited by sk_tle; 09-04-2019 at 08:34 AM.
    --
    T h o m a s

  6. #6
    Join Date
    May 2008
    Location
    DC
    Posts
    24,798
    Post Thanks / Like
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by sk_tle View Post
    Not really, they had already presented a shaft design last year but at eurobike they showed prototypes of a gear changing one that supposedly works. No footage of a anyone riding such a bike. I guess with only a minimum of lateral flex that thing may just fail to work.
    I'll say it differently. Same gravy...re-heated.

  7. #7
    Join Date
    Dec 2009
    Location
    BendOR
    Posts
    2,143
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by corko View Post
    Till I see it ridden or hear of it ridden, it’s nothing but a concept.

    ....getting a lot of attention though, but maybe that’s the intention.
    Product design from the marketing department.

  8. #8
    Join Date
    Apr 2009
    Location
    Fairfax VA
    Posts
    164
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by Too Tall View Post
    I'll say it differently. Same gravy...re-heated.
    Last year they had a recipe for gravy. This year they have something from a test kitchen no one has eaten that they are calling gravy. Oh, and this new gravy has been in a wind tunnel, which sounds quite messy.
     

  9. #9
    Join Date
    Jul 2010
    Location
    Larkspur, CA
    Posts
    7,787
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by Too Tall View Post
    I'll say it differently. Same gravy...re-heated.
    Gravy by R Carver

    No other word will do. For that’s what it was.
    Gravy.
    Gravy, these past ten years.
    Alive, sober, working, loving, and
    being loved by a good woman. Eleven years
    ago he was told he had six months to live
    at the rate he was going. And he was going
    nowhere but down. So he changed his ways
    somehow. He quit drinking! And the rest?
    After that it was all gravy, every minute
    of it, up to and including when he was told about,
    well, some things that were breaking down and
    building up inside his head. “Don’t weep for me,”
    he said to his friends. “I’m a lucky man.
    I’ve had ten years longer than I or anyone
    expected. Pure Gravy. And don’t forget it.

  10. #10
    Join Date
    Jun 2008
    Posts
    13,025
    Post Thanks / Like
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by VA_MEL View Post
    Last year they had a recipe for gravy. This year they have something from a test kitchen no one has eaten that they are calling gravy. Oh, and this new gravy has been in a wind tunnel, which sounds quite messy.
    They have a long way to go before they need to worry about a wind tunnel. First task would be creating something that can actually withstand more than fractions of a watt of power in a non-ridable static display at a bike show.

    Wake me up when someone actually rides one of these.

    At least they've gotten two consecutive years of publicity at Eurobike. That's solid marketing.
    La Cheeserie!

  11. #11
    Join Date
    Nov 2009
    Location
    North Carolina
    Posts
    1,625
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    On a related note, is Rohloff hub technology truly maxed out at this point? Has anyone here ridden one for an extended period?
     

  12. #12
    Join Date
    Jun 2008
    Posts
    3,345
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    They turned the chain and teeth sideways... This project is going to come to a screeching halt(ok, maybe a slow grind) when they introduce the slightest bit of frame deflection under reasonable power. You know, how bicycles are ridden.
    Nick Crumpton
    crumptoncycles.com
    Instagram
    "Tradition is a guide, not a jailer" —Justin Robinson

  13. #13
    Join Date
    Oct 2012
    Posts
    7,678
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by suhacycles View Post
    On a related note, is Rohloff hub technology truly maxed out at this point? Has anyone here ridden one for an extended period?
    I'd be more interested in a frame mounted gearbox than a 1500gr hub. Not sure about the pinion one but an effigear weight ~2600gr but all that weight is located in the center of the bike as low as it can be. Can we make them lighter and with a low q-factor ? No idea.
    Last edited by sk_tle; 09-05-2019 at 03:30 AM.
    --
    T h o m a s

  14. #14
    Join Date
    Jun 2009
    Location
    Aix-en-Provence
    Posts
    10,437
    Post Thanks / Like
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by crumpton View Post
    They turned the chain and teeth sideways... This project is going to come to a screeching halt(ok, maybe a slow grind) when they introduce the slightest bit of frame deflection under reasonable power. You know, how bicycles are ridden.
    Exactly !
     

  15. #15
    Join Date
    Jun 2008
    Posts
    13,025
    Post Thanks / Like
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Quote Originally Posted by suhacycles View Post
    On a related note, is Rohloff hub technology truly maxed out at this point? Has anyone here ridden one for an extended period?
    A buddy has one for his wet winter bike. It is a heavy hub but reliable and very low maintenance other than an annual flushing of the internal oil. But it's not as efficient as a traditional drivetrain, according to him.

    He's got thousands of miles on it.
    La Cheeserie!

  16. #16
    Join Date
    Jun 2012
    Location
    Seattle
    Posts
    501
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Interesting. I watched the video and I'm unclear on what engineering problem they were trying to solve. If this is about efficiency? Is there anything inherent about turning the chain sideways that causes greater efficiency? Weight? I'd like to see a comparison.
     

  17. #17
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    523
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    Stop wondering. Come to Antwerp, hop on this revolutionary POS and experience the teeth skip under load, making a loud "clonk" each time. It's awesome.

    Our bikes | Velo Antwerpen
    Chikashi Miyamoto

  18. #18
    Join Date
    Jul 2008
    Location
    SF Bay Area
    Posts
    2,099
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    I saw this at NAHBS so it must be real.
    It's not death to the derailleur, rather it is death by a thousand punctures to whoever lands on it.
     

  19. #19
    Join Date
    May 2015
    Location
    Yorkshire, UK
    Posts
    526
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: The death of the derailleur?

    As others have alluded to above, the problem with a pinion drive is that the more force you put through it the more the tendency for the teeth to be pushed apart and eventually skip. This is in contrast to a chain drive (and I know bicycle chains can skip if the chain and or cogs are worn) where the greater the force applied the tighter the chain grips the cog. A common pinion drive is found in the rear differential in a rear wheel driven car or truck. This usually involves a heavy casing to support all components rigidly in respect to one another. I do not see how this can be successfully applied to a bicycle without a weight penalty from making all the parts, including the bicycle frame, sufficiently stiff not to distort under the high and fluctuating forces involved in real riding.
     

  20. #20
    Join Date
    Oct 2008
    Location
    the crescent city
    Posts
    1,171
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    1 Thread(s)

    Default Re: The death of the derailleur?

    yay. I got to the end of the thread (so far) to confirm what I was already suspecting: I don't have to click on the bait/link. Thanks for the gravy.
     

Page 1 of 2 12 LastLast

Similar Threads

  1. Frozen to Death
    By AngryScientist in forum The OT
    Replies: 24
    Last Post: 02-17-2017, 03:57 PM
  2. Death of a front derailleur clamp
    By jscott in forum General Discussion
    Replies: 13
    Last Post: 02-20-2011, 11:39 PM
  3. Eno - The Death of Uncool
    By Yodelinpol in forum General Discussion
    Replies: 2
    Last Post: 12-22-2009, 12:05 PM
  4. Death to the Tinman
    By suspectdevice in forum General Discussion
    Replies: 3
    Last Post: 06-03-2009, 10:35 AM
  5. Anyone doing the Death Ride?
    By BryanF in forum Events
    Replies: 3
    Last Post: 07-11-2008, 01:30 AM

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •