Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Newbie
    Join Date
    May 2006
    Posts
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Replace Rear Derailleur--how to choose?

    I have a trek 400 (1982 model). The rear derailleur is a shimano rd-2505. The front sproket is 28-45-50, and the rear sproket it 13-14-17-20-24-28. I can't find an rd-2505. How do I figure out what to replace it with using the read derailleurs that are currently available? Thanks.

  2. #2
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,821
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Any Shimano rear derailleur that has a long arm will work.

  3. #3
    robhunterx robhunterx's Avatar
    Join Date
    Aug 2005
    Location
    Germantown, TN
    My Bikes
    Litespeed Ultimate/Kestrel 4000/GT Rage/Litespeed Unicoi/Litespeed Obed FS
    Posts
    120
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Pay attention to how this RD attaches to the frame and get any model (Shimano or Sram) with a long cage that attaches in the same manner.

  4. #4
    Jet Jockey Banzai's Avatar
    Join Date
    Jul 2005
    Location
    Leavenworth, KS
    My Bikes
    Cannondale CAAD9 SRAM Red, Ritchey Breakaway Cross, Nashbar X-frame
    Posts
    4,009
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Retro Grouch
    Any Shimano rear derailleur that has a long arm will work.
    At six speeds in that gear range, I would say ANY would work. That's well within the capability of all of their "road" derailleurs, and even more inside the capability of their "mountain" derailleurs.

    The main issue, as stated, will be the attachment points.

    An Acera RD, if the attachments work, will hook you up for pretty cheap, and be of enough quality to be reliable as well. After that they get "quieter", lighter, and fancier. A Sora will also hook you up pretty cheap in the "road" category.

    Be mindful of the attachment mechanism.
    Good night...and good luck

Posting Permissions

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