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  1. #1
    mtbr member
    Join Date
    Jun 2013

    Strange covered mountain bike crank set

    Hi all,
    I'm fairly new to mountain biking (but I'm not new...), and I saw a mountain bike today on a city bike route that appeared to have the crank inside a gray box, rather than what one normally sees as a crank. The rest of the bike was quite normal looking, front shocks, Fox brand, hard tail, good condition, rider looked like he knew what he was doing. Does anyone have any idea what I may have seen, or would this be some kind of a custom job. I did not have a chance to take a picture or ask the rider about the crank cover. It did not appear to be a motor, or motor assist.



  2. #2
    Bicycle Addict
    Reputation: J3SSEB's Avatar
    Join Date
    Jun 2009
    Ok, I'll bite.
    The unexamined life is not worth living - Socrates
    Bearded Women Racing

  3. #3
    I Tried Them ALL... SuperModerator
    Reputation: Cayenne_Pepa's Avatar
    Join Date
    Dec 2007
    It's a gearbox. Instead of rear derailleurs - all the gear changes occur inside that box which houses the cranks. Not a novel idea...the legendary Honda RN01 MTB had it.
    "This is a male-dominated forum... there will be lots of Testosterone sword-shaming here" ~ Kenfucius

  4. #4
    mtbr member
    Join Date
    Jun 2013
    Cool, makes sense. That's why this site is so good, a huge knowledge base, and a sharing community!




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