prototype mod bike being built...

Discussion in 'Observed Trials Discussion' started by BikeTrialGuy, Nov 22, 2004.

  1. BikeTrialGuy

    BikeTrialGuy Guest

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    how many of you would buy and ride a mod with the geometry of an echo team, but made out of Reynolds 853 steel, with vertical drops and an eccentric b/b.

    i am in the process of making this bike so i can run disc brakes and not have to deal with the disc alignment/horiz. drops problem. let me know what you think!

    -josh-
     
  2. TTownJon

    TTownJon New Member

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    Sounds like a really cool bike.... But I just bought a new stock, so it will be a while.

    Just out of curiosity though, why no have horizontal drops with the most inner position being the spot were the disks line up? Would allow people who want to run disks to do so easily and people who want the benefits of a horizontal dropout can still tention easily.

    Also curios, how would an eccentric bb work on a trials bike?
     

  3. BrettM

    BrettM New Member

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    It's nowhere near that simple. Got any idea how much that rear wheel will slide with adding or removing 2 links? Even a half link and chain wear will give problems. There are ways around it but they are complicated, time consuming, heavy usually, and adding more crap is shady.
     
  4. hydroboy

    hydroboy "Jak se mas"

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    What is wrong with running slots in the disk tab like this:




    [​IMG]



    Clearly its a shit diagram that took me 2 seconds, but hopfuly you get the idea.
     
  5. Simonk

    Simonk Guest

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    alex pv: the new sydney nolan

    (famous australian painter sydney nolan:
    [​IMG]

    wouldnt ned kelly shaped slots not be too great on a disk because there would be quite a lot of force there, causing it to move around?
     
  6. hydroboy

    hydroboy "Jak se mas"

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    Well i was thinking if you put it further towards the bb, the force the disk provides will be striaght down. Not sure if you get what i mean, but yeah.
     
  7. tomacropod

    tomacropod Rum Pig

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    Ned Kelly shaped slots would attract altogether too much police attention, although you would have a chance of being martyred outside a pub.

    - Joel
     
  8. Ed Gildea

    Ed Gildea New Member

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    bianchi had a good idea for single speed disc drop outs. go check it out.
     
  9. DangerousDave

    DangerousDave Active Member

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    I haven't been able to find a pic of that bianchi single speed mount. I've only found pics of the full bike. Anyone have a more detailed pic?
     
  10. oicdn

    oicdn Guest

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    Well, freeriders seem to have no issues with this drop-out.....

    [​IMG]

    That's the le toy and pornking dropout...... Why not make it like that and alleviate any shit having to do with oval disc slots and the such? Plenty beef....
     
  11. tomacropod

    tomacropod Rum Pig

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    I've often thought that the sliding dropout type designs from FR hardtails have lots of potential for trials bikes.

    of course the above pictured dropout couldn't cope with trials disc forces...

    - Joel
     
  12. oicdn

    oicdn Guest

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    You don't think so? 4 Bolts is alot of "locking" pressure.
     
  13. Darren

    Darren New Member

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    I think the area around the top hole on the disc mount would be likely to snap right off. the bolt system would probably be fine
     
  14. MegamoMidwest

    MegamoMidwest chicago crew

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    what makes you think an eccentric hub would be any better at coping with discs than vertical dropouts. its essentially the same thing? the wheel has so much more leverage with a disc brake, that system would break really quickly.
     
  15. Elan

    Elan steve french

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    eccentric bb sounds like an arse to be botherd wit m8. but go for et. interested to see how it becomes
     
  16. DanBowhers

    DanBowhers I farted.

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    wait wait wait i got it, use a rim brake....
     
  17. BikeTrialGuy

    BikeTrialGuy Guest

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    here is the deal:

    -all tensioning of the chain will be done through the eccentric b/b, the only reason i would build this bike is so i can use disc brakes on a mod. i would design the frame to be ran with the standard gearing, whatever it is now. the option of running other gear configurations would be non-existent. ehh..whatever, im just going to build it. show you pics when im done.
     
  18. DangerousDave

    DangerousDave Active Member

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    biketrialguy: Why wouldn't you jsut use regular horizontal dropouts on it?
     
  19. Tanner

    Tanner New Member

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    I'd pay as much as it costs me to buy the steel and TIG weld it myself. But that's just me. I'm with DangerousDave on this one, whats wrong with regular horizontal dropouts that have been used for years? Maybe I'm just too strict to the "if it ain't broke, don't fix it" adage, but, I would like to hear why you think the horizontal dropouts wouldn't work fine.
     
  20. trialsbug

    trialsbug New Member

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    Does your frame have 135mm spacing for the hub, or are you getting a 110mm eccentric hub made?

    I have been working on this same problem, but I have gone in a different direction. I have an adapter from Therapy Components that has post mount holes. I am having a 110mm hub made that has a thread for a 12t cog on one side and a disc mount on the other side. The advantage of the Brake Therapy mount is that it is mounted on the axle, so the caliper always lines up with the disc.