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Thread: two by two

  1. #1
    mtbr member
    Join Date
    Mar 2010

    two by two

    This will sound weird, so please don't judge the request.

    Instead, please help with suggestions!

    This specialized backcountry fatbike needs two gears in back on a freewheel (only two), a 32 tooth and a 34 tooth. The front needs exactly two cogs, perhaps 22 tooth and 34 tooth.

    Seems like there'll only be only need for a 14 tooth capacity for rear deraiileur, so would really like a short cage derailleur if possible. If not possible, then would like to go to smaller cogs in back but need smaller chainrings up front.

    Is there anything available for chainrings up front that's smaller than 22 teeth? Anything in the teens?

    Any ideas for derailleurs? Two speed rear freewheels? Chainsets that can have tiny chain rings?

  2. #2
    Reputation: ferday's Avatar
    Join Date
    Jan 2004
    the smallest "production" chainring is a 20t. i've never seen one smaller, and it isn't for lack of trying. they are made by action-tec, in Ti, and they aren't cheap...but i love mine.

    option 2: the mountain tamer! essentially allows you to use any rear cog as a chainring (down to about 16t). never seen one in real life, but thought about it LOL

    as far as 2-spd rear end, you should look at this, a dinglespeed hub! not a ton of gear choices though...

    of course, any SS cassette hub (hope, CK, DT swiss) can fit a few cogs on them, tons of info on the 29er forum about that. it will require modifying the limit screws on the derailleur, possibly permanently...
    what would rainbow unicorn do?

  3. #3
    mtbr member
    Join Date
    Mar 2010

    Thanks for that link.

    They describe an 18T Trials Freewheel that is installed on the crank arm and a fixed gear at the hub. Could this be used with a second chainring?

    I'll check out the 29er forum and see what the single speed forum says.

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