Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member
    Join Date
    Oct 2007
    Location
    Washington, DC
    My Bikes
    CAAD10 5, Trek 1000 Alpha Series
    Posts
    454
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Paranoid Bike Compatibility Question

    ok so im building a bike and just realized that my rear deraileur (8sp) was not compatible with the rest of my set up (9sp) so i'm a bit paranoid with the rest of my setup. i just bought the new tiagra 9sp shifters and i have a compact double crankset. does it matter that the left hand shifter is a triple?

  2. #2
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,781
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    First, assuming its a Shimano 8-speed rear derailleur and NOT Dura Ace, it will work fine with your 9-speed shifters, cassette and chain. I'm currently using a 105 8-speed rear derailleur on an otherwise all 9-speed 105/Ultegra bike and it shifts perfectly.

    Second, Tiagra 9-speed (like both 105 and Ultegra 9-speed) brifters are both double and triple compatible.

  3. #3
    Gone, but not forgotten Sheldon Brown's Avatar
    Join Date
    Jul 2002
    Location
    Newtonville, Massachusetts
    My Bikes
    See: http://sheldonbrown.org/bicycles
    Posts
    2,301
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by aquateen View Post
    ok so im building a bike and just realized that my rear deraileur (8sp) was not compatible with the rest of my set up (9sp) so i'm a bit paranoid with the rest of my setup. i just bought the new tiagra 9sp shifters and i have a compact double crankset. does it matter that the left hand shifter is a triple?
    This is an imaginary problem.

    There's no such thing as an "8-speed" derailer except in the imagination of the marketeers.

    See: http://sheldonbrown.com/speeds for more general info on interchangeabilitude.

    Sheldon "Not To Worry" Brown
    Code:
    +-----------------------------------------------------+
    |  If one lets fear or hate or anger take possession  |
    |  of the mind, they become self-forged chains.       |
    |                            --Helen Gahagan Douglas  |
    +-----------------------------------------------------+
    [COLOR=blue][CENTER][b]Harris Cyclery, West Newton, Massachusetts[/b]
    Phone 617-244-9772, FAX 617-244-1041
    [URL= http://harriscyclery.com] http://harriscyclery.com[/URL]
    Hard-to-find parts shipped Worldwide
    [URL=http://captainbike.com]http://captainbike.com[/URL]
    Useful articles about bicycles and cycling
    [URL=http://sheldonbrown.com]http://sheldonbrown.com[/URL] [/CENTER] [/COLOR]

  4. #4
    Senior member Dan Burkhart's Avatar
    Join Date
    Oct 2004
    Location
    Oakville Ontario
    Posts
    4,693
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Sheldon Brown View Post
    This is an imaginary problem.

    There's no such thing as an "8-speed" derailer except in the imagination of the marketeers.

    See: http://sheldonbrown.com/speeds for more general info on interchangeabilitude.

    Sheldon "Not To Worry" Brown
    Code:
    +-----------------------------------------------------+
    |  If one lets fear or hate or anger take possession  |
    |  of the mind, they become self-forged chains.       |
    |                            --Helen Gahagan Douglas  |
    +-----------------------------------------------------+
    Sheldon invents yet another word. "Interchangeabilitude" I like it. Webster just can't keep up.
    Gearhubs demystified and other cool stuff.


    Rule #12: The correct number of bikes to own is n+1

  5. #5
    Senior Member z415's Avatar
    Join Date
    Apr 2006
    Location
    Gainesville/Tampa, FL
    My Bikes
    Trek 1000, two mtbs and working on a fixie for commuting.
    Posts
    2,347
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dan Burkhart View Post
    Sheldon invents yet another word. "Interchangeabilitude" I like it. Webster just can't keep up.
    Give Webster a few years, it'll be in there... or better yet, there should be "specialty" dictionaries such as a cycling one.
    Falling is learning...[SIGPIC][/SIGPIC]...learn to not fall in a box.
    Any good American will watch THIS -and- WHERE WAS MY BIKE MADE?

  6. #6
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,781
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Sheldon Brown View Post
    This is an imaginary problem.

    There's no such thing as an "8-speed" derailer except in the imagination of the marketeers.

    Sheldon "Not To Worry" Brown
    Since my 105 rear derailleur was bought when 105 was strictly an 8-speed goup, it is de facto an "8-speed rear derailleur". Nevermind that it will index just fine with 7,8,9 and 10-speed components, it's still an 8-speed derailleur. So there!

  7. #7
    Senior Member
    Join Date
    May 2004
    Location
    Wilmington, DE
    My Bikes
    2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1
    Posts
    8,767
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Sheldon Brown View Post
    There's no such thing as an "8-speed" derailer except in the imagination of the marketeers.
    Well, the finish will match the finish of other components from that group, most of which are #-of-speeds specific. But that's where the compatibility issues end. Same thing applies to cranksets (at least modern ones) as far as I know. My wife's road bike, which I converted to an 8 speed, is still using the original crank from when it was a 6 speed.

Posting Permissions

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