Advertise on Bikeforums.net



User Tag List

Results 1 to 21 of 21
  1. #1
    audio champion
    Join Date
    Sep 2006
    Location
    NC
    My Bikes
    2006 Lemond Poprad
    Posts
    22
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    building a fixie with vertical dropouts

    i want to build myself a fixie/ss but am new to this. i found a decent frame, but it has vertical dropouts on the back. how much of a problem will this be as far as chain tension, etc?

    thanks!

  2. #2
    in grind we crust
    Join Date
    Sep 2006
    Location
    brooklyn and anywhere
    My Bikes
    de rosa prestige 1982 track, de rosa prestige 1982 road, olmo team 1985 road, hoffy track, faggin track, 1981 bianchi piaggio track, d'accordi road, bob jackson singlespeed
    Posts
    204
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    sheldonbrown.com

    eno hub
    etc etc

  3. #3
    o.O Seggybop's Avatar
    Join Date
    Dec 2004
    Posts
    576
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    it will work if you are ok with other than the exact gear combination you plan for. you will need to try some different combinations to find one that has good tension. if that's not acceptable, you can buy the ENO hub, but it's horribly expensive.
    mi yu mi yu

  4. #4
    Elitist carleton's Avatar
    Join Date
    Jul 2005
    Location
    Atlanta, GA
    Posts
    10,858
    Mentioned
    6 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by Seggybop
    it will work if you are ok with other than the exact gear combination you plan for. you will need to try some different combinations to find one that has good tension. if that's not acceptable, you can buy the ENO hub, but it's horribly expensive.
    ...and which part of that is good news?

    A "Golden Ratio" is terribly hard to find. And if you don't have several chainrings and cogs at your disposal. Even harder.

    Dude, just try to find track/fixie frame.

  5. #5
    audio champion
    Join Date
    Sep 2006
    Location
    NC
    My Bikes
    2006 Lemond Poprad
    Posts
    22
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    word. the thing about this frame is that it's cheap. track frames are 5x more expensive, at least, on ebay. i'll keep looking around though... just want a project to work on. thanks for the help, everyone.

  6. #6
    Senior Member
    Join Date
    Jun 2004
    Location
    So Cal
    My Bikes
    peugot fixed, Steelman cyclocross, Yeti Kokopelli
    Posts
    416
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    look at local Bike co ops or police auctions

  7. #7
    Senior Member
    Join Date
    Aug 2005
    Posts
    1,153
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    a half link (made by KMC, I think) may be the ticket.

  8. #8
    o.O Seggybop's Avatar
    Join Date
    Dec 2004
    Posts
    576
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by carleton
    ...and which part of that is good news?

    A "Golden Ratio" is terribly hard to find. And if you don't have several chainrings and cogs at your disposal. Even harder.
    Not really. Have you tried it much? The easiest way to find one is to put on a wheel with a gear cluster (that's so hard to come across) and try combos until you find a good one. A half-link, about a dollar from the local hardware store, will make this significantly easier. Once you find a good combination acquire the fixed cog in that size.
    mi yu mi yu

  9. #9
    D=RxT
    Join Date
    Sep 2006
    Posts
    141
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm surprised noone mentioned this.

    http://www.peak.org/~fixin/personal/fmu/php/fixmeup.php

  10. #10
    one word, not two braingel's Avatar
    Join Date
    Oct 2006
    Location
    se portland
    Posts
    825
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i'm converting a newer mountain bike with vertical dropouts to a singlespeed, and i bought a chain tensioner. it's not as nice as not having one, but for the work it would take to find the right ratio i figured i would just use it. i got it for $1 on ebay(that was weird). that fixmeup website looks nice though...i might just do that now.

  11. #11
    Elitist carleton's Avatar
    Join Date
    Jul 2005
    Location
    Atlanta, GA
    Posts
    10,858
    Mentioned
    6 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by Seggybop
    Not really. Have you tried it much? The easiest way to find one is to put on a wheel with a gear cluster (that's so hard to come across) and try combos until you find a good one. A half-link, about a dollar from the local hardware store, will make this significantly easier. Once you find a good combination acquire the fixed cog in that size.
    Yeah, I tried it back in 2002 when I converted a Aluminum Trek 1000 to SS. I was working at a bike shop at the time with access to lot of parts and even then it was a frustrating experience. I finally got it working, but:
    1) my ratio was like 52/16
    and
    2) I vowed to never try it again.

    Oh yeah, when you are working on a Golden Ratio, once you find it...that's it. You are pretty much stuck in that gear combo whether you are comfy with it or not...like my 52/16.

  12. #12
    ;
    Join Date
    May 2006
    Posts
    213
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Carleton, though I am too tired to really explain it more in depth I can assure you that a magic, or golden ratio, and your 52x16 could have been altered easily. I forget exactly how off the top of my head, but it is possible.

    Something along the lines of:

    40x18 = 42x16...

  13. #13
    Elitist carleton's Avatar
    Join Date
    Jul 2005
    Location
    Atlanta, GA
    Posts
    10,858
    Mentioned
    6 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by donkekus
    Carleton, though I am too tired to really explain it more in depth I can assure you that a magic, or golden ratio, and your 52x16 could have been altered easily. I forget exactly how off the top of my head, but it is possible.

    Something along the lines of:

    40x18 = 42x16...
    Agreed.

    But, for each chainstay length, you get 2 maybe 3 magic ratios which are about 8 gear inches apart. And if I ever wanted to adjust to one of the other gear inches, I'd have to have/buy a cog *AND* a chainring. A problem easily solved by a rear-facing and (to a good extent) a horizontal dropout where you can change the rear cog from like 14-19t to your taste.

    I'm not saying someone shouldn't do it. Just know what you are getting into.

  14. #14
    Geek Extraordinaire sivat's Avatar
    Join Date
    Feb 2006
    Location
    Long Beach, CA
    My Bikes
    Bianchi Advantage Fixed Conversion; Specialized Stumpjumper FS Hardtail
    Posts
    1,769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you want to go single speed, you can just get a chain tensioner. If you want to go fixed, thats when it gets harder.
    I'd rather have a bottle in front of me than a frontal lobotomy.

    Sintesi Conversion Serotta Track

  15. #15
    LF for the accentdeprived
    Join Date
    May 2005
    Location
    Budapest, Hungary
    Posts
    3,550
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Not desperately hard to build a vertical-drop fixed, just keep in mind two things 1)it is a hack 2)it is a hack.
    Not too hard at all to find a magic ratio. Have a half link and a couple of rings and cogs handy and try them out, or try one of the online calculators. They may even work, who knows?
    Be prepared that the chain will stretch... then you need to find a game plan. Mine was to pick up a file and attack both the dropout and the axle. Did I tell you it is a hack?
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

  16. #16
    Sheldon Brown's posse shogun17's Avatar
    Join Date
    Jul 2006
    Location
    Oz-tray-lee-ah
    My Bikes
    BMC SL01, XtC, Rhythm GX and a frankenstein avalanche 2.0
    Posts
    1,046
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I just built myself a singlespeed/fixie MTB out of a GT avalanche. Golden Ratio, 42/18 or with flattened axles 42/17 as well.
    Last edited by shogun17; 10-14-06 at 07:41 AM.

  17. #17
    jack of one or two trades Aeroplane's Avatar
    Join Date
    Jun 2005
    Location
    Suburbia, CT
    My Bikes
    Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
    Posts
    5,635
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by LóFarkas
    Not desperately hard to build a vertical-drop fixed, just keep in mind two things 1)it is a hack 2)it is a hack.
    Not too hard at all to find a magic ratio. Have a half link and a couple of rings and cogs handy and try them out, or try one of the online calculators. They may even work, who knows?
    Be prepared that the chain will stretch... then you need to find a game plan. Mine was to pick up a file and attack both the dropout and the axle. Did I tell you it is a hack?
    Ló is the king of the make-it-work bicycle. If you really want a project, not just a bike kit, it can be done. But be prepared for frustration.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  18. #18
    LF for the accentdeprived
    Join Date
    May 2005
    Location
    Budapest, Hungary
    Posts
    3,550
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That title belongs to Sheldon, but I'm trying to do my best, too
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

  19. #19
    antisocialite dirtyphotons's Avatar
    Join Date
    Apr 2006
    Posts
    3,385
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    the online magic gear calculator works perfectly. measure carefully (center of bb to center of axle) and you'll get it right on the first try.

    however, your chain will stretch over time and you will either need to deal with the slack or replace your chain often.

    it's even more advisable than normal to have a brake on there if you're running a magic gear.

  20. #20
    Bike fiend. Analog's Avatar
    Join Date
    Jan 2006
    Location
    Bomb City, WI
    My Bikes
    Giant STP SS, Trek 400 (Fixed), 1970's Orion, Huffy Flatbed BMX, Vintage Huffy Kids Cruzer, Vintage Sears Cruiser, Trek Prototype Frame (fixed)
    Posts
    93
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You know, if it's not that great of a frame to begin with, you only need something like 1/2" of movement in the dropouts. A rat-tail file or jeweler's saw both work wonders, and half-links are cheap.
    I've done it before, and never had any problems. Just don't take away any more material than you absolutely need to.

    [edit] Sheldon also proposes filing down two sides of your axle, but I'd rather keep the axle whole, and file the dropouts.

  21. #21
    LF for the accentdeprived
    Join Date
    May 2005
    Location
    Budapest, Hungary
    Posts
    3,550
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You don't need 1/2". With an optional half link, only 1/4" is enough to make any ratio work. And if you're willing to drop or add 1 tooth in the front as the situation requires, then even less. (1 tooth will be <2 gear inch change... I doubt that you'll notice)
    Again, it's preferable to find a setup where you're at the front of the dropout w/ new chain.
    Last edited by LóFarkas; 10-14-06 at 03:51 AM.
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

Posting Permissions

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