Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member cyclist2000's Avatar
    Join Date
    Sep 2009
    Location
    Up
    My Bikes
    Masi (retired), Giant TCR, Eisentraut, Jamis Aurora Elite, Zullo (trainer bike), Cannondale, Stumpjumper, Waterford(N+1), Tern D8 (N+1)
    Posts
    2,845
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Mods to Jamis Aurora Elite Drive Train

    I have a 2009 Aurora Elite, it has 105 STI 10 speed shifters, Ultegra RD and a 12-27 rear cog. I was thinking to put a 9 speed 11-34 cassette. If I made this change I am assuming that the RD would need to be replaced with a mountain bike RD. This would change my low end gear inches from 30 to 23.

    Would the shifter work without any problems? I don't know if the cable pull is the same or would I need to get a JTek shiftmate to cleanup any shifting problems?

    And if you have a better idea, throw it out here.
    I had thought of using the new 10 speed cogs and RD but this seems to be a cheaper way to go.
    I don't do vintage, I bought them new, rode them, kept them. Now they are just old bikes
    http://www.flickr.com/photos/bustercrb/sets/72157623483647522/

  2. #2
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,383
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    With very few exceptions, Shiman (rear) shifters all pull the same cable, so you should be OK with that.

  3. #3
    Senior Member
    Join Date
    Apr 2009
    Location
    Toronto, ON
    Posts
    99
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    To make the 10 sp shifter work with 9 cogs, you may need to look at getting a shiftmate since the cassette spacing is different - OR - look at pairing SRAM Apex cassette with 9 sp Shimano MTB derailleur.

    See shiftmate details here: http://www.sheldonbrown.com/harris/shiftmate.html
    and
    Cassette Spacing here: http://www.sheldonbrown.com/k7.html#spacing

    According to sheldon, 9sp is 4.34 mm, whereas 10sp is 3.95 mm

  4. #4
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,383
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by novacoke View Post
    To make the 10 sp shifter work with 9 cogs,
    Dang, I missed that he was planning to change speeds as well as range. That's not a happy combo.

  5. #5
    29er Rider MNRon's Avatar
    Join Date
    Oct 2009
    Location
    Central Minnesota
    My Bikes
    Gary Fisher ARC Pro, Cannondale Caffein 29er Lefty hardtail, building a Kona Major One, Custom steel frame from early 80's with Campy Nuovo Record
    Posts
    169
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How about trying a 10spd SRAM cassette and Deore XT RD? The RD should work fine, but not sure about the cogs.
    Don't take life too seriously, you won't get out alive anyway.

  6. #6
    Senior Member cyclist2000's Avatar
    Join Date
    Sep 2009
    Location
    Up
    My Bikes
    Masi (retired), Giant TCR, Eisentraut, Jamis Aurora Elite, Zullo (trainer bike), Cannondale, Stumpjumper, Waterford(N+1), Tern D8 (N+1)
    Posts
    2,845
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MNRon View Post
    How about trying a 10spd SRAM cassette and Deore XT RD? The RD should work fine, but not sure about the cogs.
    I was thinking about the 9-speed setup to save money on the components. I had thought about a 10 speed setup but the derailleur and cog are more expensive than the 9-speed.

    The cost savings won't be so good if I need the shiftmate.
    I don't do vintage, I bought them new, rode them, kept them. Now they are just old bikes
    http://www.flickr.com/photos/bustercrb/sets/72157623483647522/

  7. #7
    biked well well biked's Avatar
    Join Date
    Jul 2005
    Posts
    6,883
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Here's what I did to my '09 Aurora Elite (GREAT bike, btw): install a 26t small chainring up front to replace the stock 30t small ring. Front shifting is still very good. I'm still using a 12 x 27 10 speed cassette.

    If I wanted lower gears than that, here's what I would do: install one of the new 10 speed cassettes by Shimano or SRAM in something like 11 x 32 or 11 x 34 and install a Shimano mountain bike rear derailleur, realizing that the new Shimano Dyna-Sys "10 speed" mountain bike derailleurs have a different cable pull ratio than other current Shimano rear derailleurs, so I would need to stay away from them because they won't be compatible with my 10 speed road shifters. Oh, and I'd also need a longer chain if I installed one of those cassettes.

Posting Permissions

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