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  1. #1
    Senior Member escarpment's Avatar
    Join Date
    Oct 2009
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    chicago
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    cannondale crit 3.0, specialized allez, old giant mtb/hybrid
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    REAR Derailleur question

    So my allez got stolen and I replaced it with an old trek 1420 that was given to me. Great bike but I have been swaping out old parts every chance I get.

    Heres the Drivetrain breakdown. shimano everything. 7 speed HG. 105 index downtube shifters. Then a Dieore Triple crank and deore long cage rear derailleur.

    The stuff is kinda bulky and I would like to replace it

    I have an old 105 9 speed derailleur that I was going to try and set up and limit it to the 7 speeds and replace the triple crank with like a shimano DA or 600 crank. And approprate FD.

    I would like to keep this as cheap as possible... And Would like to just keep the DT shifters. I cannot afford to upgrade the Derailleurs and Then get new sti shifters. I dont want to replace the whole group. Just bits and pieces.

    Will I loose the Indexing ability if I run the 9 speed derailleur

    Would I be better off replacing the Rear Derailleur with an old shimano 600 or 105. 7 speed derailleur and approprate crank. Will that even work.

    Sorry if this post is a little disorganized but I have many questions. Thanks.

  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!
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    Shimano rear derailleurs (with a couple of exceptions that aren't an issue here) are indifferent to the number of cassette "speeds" and only do what the shifters tell them to. Your 105 9-speed rd will work fine with your 7-speed dt shifters and cassette.

  3. #3
    Bianchi Goddess Bianchigirll's Avatar
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    Apr 2009
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    Camp Hill, PA
    My Bikes
    Too many to list here check my signature.
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    +1 Although you may need a new BB for the double V triple crank
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo SOLd, '86 Volpe, '89 Axis SOLD, '79 Mixte SOLD, '99 Mega Pro XL Ti SOLD, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe SOLD, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

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