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  1. #1
    World's slowest cyclist.
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    Triple crank to double crank, what else do I need to change?

    I posted this over in the road bike forum but it was suggested that I post it here instead (sorry about the double post, mods feel free to delete the one in Road bikes).

    I'm thinking of switching my triple crank out for a double. I've got Shimano 105 shifters. Can I just use the same shifters and set the Der stops to accommodate the double or do I need to get new shifters? I assume I can use the same front Der (Shimano Tiagra)?

  2. #2
    Senior Member Retro Grouch's Avatar
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    How many cogs do you have in back?

    Shimano rates their 9-speed shifters as either double or triple compatible. I don't know what the exact difference is. If it was my bike I'd give it a try and see if I could make it shift to my satisfaction.

    FWIW, I own two bikes with Ultegra 9-speed shifters. On the tandem triple I get 1 shift position for the granny, 2 shift positions for the middle ring and 1 shift position for the big ring. The klein double has 2 shift positions for each chainring. Both bikes have flight Deck computers and both indicate the appropriate chainring in all shift positions so I know I've got them set up as Shimano intended.

  3. #3
    World's slowest cyclist.
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    Quote Originally Posted by Retro Grouch View Post
    How many cogs do you have in back?

    Shimano rates their 9-speed shifters as either double or triple compatible.
    I've got 9 in back. Thanks, didn't know the shifters did both. IIRC there are four stops on the front shifter just like you indicate.

  4. #4
    Low car diet JiveTurkey's Avatar
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    If the shifter works for a triple, it will also work for a double. You'll need to decide which two of the three positions to use on the shifter. There are pros and cons of using either inner/middle or middle/outer.

    The front derailleur should be fine.
    Quote Originally Posted by slopvehicle View Post
    Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.

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