Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Newbie
    Join Date
    May 2007
    Posts
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    rear cog stripping....?

    so i recently converted my bike to a fixie, and got a brand new wheel for it, has less than 10 hours or so riding and the rear cog is already starting to strip? can anyone give me some advice on what to do to prevent further damage, and once stripped is it too late to do anything about it?, also, advice on how to avoid this in the future would be great, thanks,
    -ryan,
    funkstamari@yahoo.com

  2. #2
    Who cares, just ride it!
    Join Date
    Jun 2006
    Location
    Melbourne
    My Bikes
    1986 Marinoni Special, 1992ish Davidson Impulse, 1981 Miyata 1000, 1981 Apollo Gran Sport, 1983 Nishiki International
    Posts
    988
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    When you say the cog is stripping, do you mean that it is coming loose, or that there are exposed stripped threads? Are you running a proper track hub with reverse-threaded lockring, or a freewheel hub with standard B.B. lockring?
    N-1 is my long-term goal

  3. #3
    * vpiuva's Avatar
    Join Date
    Jan 2007
    Posts
    3,458
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Even if you have a track or flip/flop, there are different threading standards and you need to make sure your hub and cog match.

  4. #4
    Senior Member miamijim's Avatar
    Join Date
    Aug 2003
    Location
    Tampa, Florida
    Posts
    11,611
    Mentioned
    9 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by vpiuva
    Even if you have a track or flip/flop, there are different threading standards and you need to make sure your hub and cog match.

    I agree. It is possible to have a proper match and strip the threads. Poor quality will do it. I've seen it once or twice. Your cog should thread on easily, not sloppily or loosely.
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

  5. #5
    Your mom
    Join Date
    Aug 2006
    Posts
    2,546
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'd pull the wheel, take the lockring off, rotafix the cog on, reinstall the lockring (using a good spanner, like the Hozan), and see where that gets you.

  6. #6
    JRA...
    Join Date
    Oct 2003
    Location
    philly
    My Bikes
    trek 520 & 736, DeRosa Professional, Fuji Professional, Raleigh International 3-speed, Saronni (any info people?), Humber 3-speed, Raleigh Sports, Carlton Grand Prix coming soon!
    Posts
    839
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by vpiuva
    Even if you have a track or flip/flop, there are different threading standards and you need to make sure your hub and cog match.
    i think you're referring to lockring threading. unless he dug up something ancient, using the wrong thread cog is unlikely.

    Quote Originally Posted by funkstamari
    can anyone give me some advice on what to do to prevent further damage, and once stripped is it too late to do anything about it?, also, advice on how to avoid this in the future would be great, thanks
    ryan, about the only thing you can do is try to tighten the cog down, it'll either hold or it won't. if it does, make sure the cog and lockring are TIGHT. i brace the wheel, with inflated tire on, against something solid and lean into the chainwhip with all my weight (~160 lbs, YMMV) to lock the cog down; i do down similarly to the lockring with a set of lockring pliers, which work better than a spanner.

    some hubs and cogs are simply prone to stripping, no matter how they're installed. avoid quando and sovos hubs, at least the older ones; the threads are soft. cheapie cogs like cyclo also should be avoided, they are thin and therefore don't distribute load well, and can wreck any hub.

  7. #7
    Senior Member
    Join Date
    Jan 2005
    Posts
    572
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I stripped the hub on my first track bike in 1965 - French-threaded hub, BSA sprocket. The seen-it-all local bike mechanic wrapped the stripped threads in aluminum foil. Amazingly, the repair worked. I don't remember whether I replaced the wheel at some point before selling the frame three years later.

Posting Permissions

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