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  1. #1
    Kid A TurbineBlade's Avatar
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    1996 Gary Fisher Wahoo question

    Hi - I have the bike listed above with the following specs:

    Component Group Shimano Altus C90
    Brakeset Shimano Altus brakes, alloy levers
    Shift Levers Grip Shift MRX-100
    Front Derailleur Shimano Altus top-swing, top-pull/clamp-on 28.6 mm
    Rear Derailleur Shimano AceraX
    Crankset Shimano Altus, 24/32/38 teeth
    Pedals Resin
    Bottom Bracket Shimano BB-CT91, 120 mm spindle
    BB Shell Width 73mm English
    Rear Cogs 7-speed, 11 - 28 teeth
    Chain KMC UG-50, 1/2 x 3/32"
    Seatpost Alloy micro-adjust, 26.6 mm diameter
    Saddle Fisher Supersoft
    Handlebar Steel
    Handlebar Extensions Not included
    Handlebar Stem Steel
    Headset 1 1/8" steel

    I've never removed a crankset with one of those clamped-on front derailleur tabs before.

    Is it possible to remove the cranks, remove the clamp, and then still use the 120mm bottom bracket for a different crankset? I'd like to actually install a double crank on this bike because the stock gearing is WAY too low for road use. I realize I may have to play with the chainline a bit....no biggie.

    Thanks!
    Cyclist, angler and aquarist

  2. #2
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    Clamp-on front derailleurs are very easy to remove. Loosen the cable fixing bolt and then remove the clamp bolt and it comes right off the seat tube. Removing the crank will require a 14 mm socket to remove the fixing bolts (or nuts) and a crank puller to remove the crank arms.

    However, whether a different crank will work with the current bottom bracket depends on which one you choose and the only way to "play with the chainline" is to use the correct length bottom bracket spindle.

  3. #3
    Kid A TurbineBlade's Avatar
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    Sure thing - I have a crank puller for a square taper crankset and of course a socket set.

    But! I think this front derailleur is fixed to the bottom bracket -- it's one of those kinds I believe. Are these removable?

    As far as the chainline, maybe I should specify that I'm installing a double crankset with just a single chainring and probably no front derailleur.....so I would theoretically have the option to install the ring on the inside or outside, and also with spacers if needed. I'm thinking the 120 with the ring on the inside would give a decent chainline, but I may need to play around with it some. As a last resort I could try to pick up a 73 X 118 or something and try the same thing.

    Sorry - I didn't make that clear in my OP.

    Thanks!
    Last edited by TurbineBlade; 09-26-12 at 08:21 AM.
    Cyclist, angler and aquarist

  4. #4
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    if the derailleur is attached to the bb (by way of a black steel plate looking thing) then yes it is removable. It is simply tightened on behind the fixed cup (drive side bearing cup). Once you remove the cup it will be removed! Your specs above list it as a clamp on front derailleur so a little confused on the question.

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