Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Member toyotaboy's Avatar
    Join Date
    Oct 2009
    Location
    LITH, IL
    My Bikes
    trek 930
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    newbie derailleur question

    I've got a Trek 930, it's been rock solid for probably 10 years. Starting to get chain slip, so I took it into a shop, and they told me the derailleur was bent so they bent it back the best they could (and told me it probably needed to be replaced soon). Wish they had told me that before I picked it up because I probably would have opted to just replace it, because after about 2 rides the problem is back.

    So here's my question, I'd rather not pay retail pricing for a new derailleur (I'll still have them install it), but I'm clueless if there's any difference between them. All I know about my derailleur is that it's 1:1 actuation ratio and that it's direct mount (not a hanger). Are there different spur gear teeth or is that standard? (I would think different teeth count would affect the chain). I'd appreciate any response.

  2. #2
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If it's 1:1, it's SRAM. It should say that on the derailleur itself.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
    Member toyotaboy's Avatar
    Join Date
    Oct 2009
    Location
    LITH, IL
    My Bikes
    trek 930
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yes 1:1 on derailleur

    Thanks for the quick response!
    I ride the asphalt, one mile at a time

  4. #4
    Member toyotaboy's Avatar
    Join Date
    Oct 2009
    Location
    LITH, IL
    My Bikes
    trek 930
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    3 more questions:
    * Do I want long, medium, or short cage?
    * Do the amount of teeth matter on the cogs, or no because the pitch is the same on all of them?

    Started looking at some derailleurs, and noticed on mine it has a 3rd screw that pushes against the frame as another adjustment, not sure if that's common?
    I ride the asphalt, one mile at a time

  5. #5
    Great State of Varmint Panthers007's Avatar
    Join Date
    Sep 2008
    Location
    Dante's Third Ring
    Posts
    7,481
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    What size - medium, long...- do you need? What is the size of your cassette in the rear? How many cogs and the number of teeth on the largest (lowest gear) cog? Cassettes are measured as being 5-speed (5-cogs) at 12-28. Or 7-speed @ 12 - 32, etc. You should count them and give us the numbers of the speeds (cogs) and the sizes (number of teeth) from smallest to largest.

    The size differential and number will determine the best derailleur to use in your application.
    How do you keep an idiot in suspense?

  6. #6
    Quirky Grifter LesterOfPuppets's Avatar
    Join Date
    Sep 2008
    Location
    Vancouver, USA
    My Bikes
    My War
    Posts
    20,001
    Mentioned
    42 Post(s)
    Tagged
    7 Thread(s)
    Chainring count and teeth counts are also important when choosing derailer model and cage length.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

Posting Permissions

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