Advertise on Bikeforums.net



User Tag List

Results 1 to 13 of 13
  1. #1
    Member
    Join Date
    Jul 2009
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Need Help: Something is "Slipping" on my newly built Fixed Gear

    Hi,
    I recently converted my old 12 speed General into a fixed-gear. I did the "real" conversion with new cranks and a set of cheap track wheels with a flip-flop hub. I just road the bike for the first time yesterday and when I go to attempt a skid-stop or am standing to climb large hills something occasionally "slips." It is the weirdest feeling and I am not sure what is causing it. I am almost certain it is not my crank arm on the bottom bracket spindle. I am wondering however if the "slipping" is not caused by my rear wheel moving slightly when the axle is really being pulled hard. Funny though, you think I would notice a difference in the chain tension if this was happening, it does seem that my chain tension is any different though after the "slipping" occurs. Anyway, I don't want to die and this slipping thing makes me feel pretty unsafe.



    Any thought??? Thanks for the help, I have searched the forums for some kind of answer but found nothing.

    --Norman

  2. #2
    Get on your bikes & ride! xB_Nutt's Avatar
    Join Date
    May 2006
    Location
    Lextown
    My Bikes
    See signature (it varys day to day)
    Posts
    1,076
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Loose lock ring maybe? This will allow the cog to back off slightly when appying back pressure and then tighten up again when you apply forward pressure.
    Litespeed Classic
    Soma Double Cross DC

  3. #3
    Senior Member
    Join Date
    May 2008
    Location
    Davis/Lafayette, CA
    My Bikes
    1984 trek 460 conversion, 2008 Lynskey R320, Peloton track bike, 1990's MBK trainer, 2004 Fisher tassajara, 70's Raleigh Gran prix. 70's moto mirage conversion (stolen), 80's Shogun Kaze (sold)
    Posts
    2,009
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    your cog and lockring aren't tightened down enough.

    rotafix the cog, then crank down on he lockring. use a tool to do this to get it as tight as possible (logic says buy a lockring tool if you don't already have one. I used a dremel and ground down a pair of groove joint pliers to have some lockring sized buckteeth on the end to grab it)

    remember the lockring turns left to tighten (reverse threaded)

  4. #4
    Member
    Join Date
    Jan 2009
    Location
    NYC
    My Bikes
    Klein, Trek, Something
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Your rear cog/lockring assembly.

    The cranks can't really slip since the taper/hole interface is square, your axle is basically bolted to the frame while the hub rotates around it so those two points aren't really options. On FG that leaves only the cog/lockring.

    And yes, it can kill you.

    Arthur

    Edit - Wow I type slowly. No replies when I started!

  5. #5
    Member
    Join Date
    Jul 2009
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks a ton for the information. I will checkout that rear cog asap

  6. #6
    Senior Member
    Join Date
    Jul 2009
    Location
    sac, california
    My Bikes
    Nishiki olympic
    Posts
    102
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    what makes it a "real" conversion? cause you bought a crank set?

  7. #7
    :)
    Join Date
    Nov 2006
    Location
    duluth
    My Bikes
    '07 Pista, '09 Fantom Cross Uno, '8? Miyata, '67 Stingray, '0? Zoo mod trials, Tallbike, Chopper, '73 Schwinn Collegiate, '67 Triumph Chopper, '69 CB350, '58 BSA Spitfire, '73 CB450
    Posts
    3,391
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    your bar tape has the wrong threading... I mean lockring and cog aren't tight, fix it IMMEDIATELY, hopefully your hub isn't already hosed.
    Quote Originally Posted by Santaria View Post
    because physics has more street cred than tarckstars.

  8. #8
    Member
    Join Date
    Jul 2009
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Why would my hub be "hosed?"

  9. #9
    .
    Join Date
    Jun 2009
    Location
    Knoxville, TN
    Posts
    101
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    He means stripped

  10. #10
    Member
    Join Date
    Jul 2009
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks

  11. #11
    Senior Member das_pyrate's Avatar
    Join Date
    May 2009
    Location
    dirty meda
    My Bikes
    EAI Bareknuckle, 1981 Gios Aerodynamic, Giant Boulder
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    happened to me too. make sure that thing is super tight.
    Quote Originally Posted by bhamlax View Post
    I find small children (under 5 works best) to be exceptionally light and very easy to trick.

  12. #12
    MAK
    MAK is offline
    Member
    Join Date
    Jun 2005
    Location
    Delaware
    My Bikes
    Specialized Roubix, Trek 520, Felt F80, Schwinn Madison, Gary Fisher Nirvana, Nishiki Bravo
    Posts
    836
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You may want to check this out before you disassemble your bike. I had the same problem and it turned out that my chain wasn't taut enough. I had just repaired a flat and wasn't super careful when I reinstalled the rear wheel. A simple on the side of the road adjustment and all was well.

  13. #13
    Paste Taster Retem's Avatar
    Join Date
    May 2006
    Location
    Denver, Co
    My Bikes
    1970's kobe, Jury Bike, Dahon Boardwalk S1, Moto Outcast 29, Scrambler v3
    Posts
    4,390
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    stripped hub or loose chain ring either way fix it now or you may be another traffic casualty
    I am dyslexic so bear with my posts.... [SIGPIC][/SIGPIC]

Posting Permissions

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