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  1. #1
    Join Date
    Aug 2010
    Location
    Wilts, UK
    Posts
    903

    Another Cranks/Bottom Bracket question

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    I was trying to read the serial number from the bottom bracket of my mixte this evening, and noticed that there's a fairly sizeable gap between the crank and the bottom bracket compared to my other bikes. Is this normal? I may well be worrying unnecessarily as the bike rides fine. Thank you.
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    Dawes Cambridge Mixte, Specialized Hardrock, Specialized Vita.

    mixedbabygreens My blog, which really isn't all about the bike.

  2. #2
    Join Date
    Jan 2011
    Location
    Austin, TX
    Posts
    212
    The gap is not a problem, unless you feel that the pedals are so far out from the frame that you feel "bowlegged" when you pedal. It is strictly a comfort issue.
    JEAN

    2011 Specialized Ruby Elite - carbon fiber go-fast bike
    DiamondBack Expert - steel road bike
    Klein Pinnacle - classic no-suspension aluminum MTB

  3. #3
    Join Date
    Aug 2010
    Location
    Wilts, UK
    Posts
    903
    ahh brilliant, thank you. I'm trying not to assume the worst because they didn't put air in the tyres before I collected the bike.
    Dawes Cambridge Mixte, Specialized Hardrock, Specialized Vita.

    mixedbabygreens My blog, which really isn't all about the bike.

  4. #4
    Join Date
    Apr 2009
    Location
    California
    Posts
    371
    Here's how to check if your cranks & pedals are centered on the bike:

    Turn the cranks until the left crank points up along the seat tube. Measure from the left side of the seat tube to any convenient distinct point on the left pedal. Now turn the cranks 180 degrees so the right crank points up. Measure from the right side of the seat tube to the corresponding point on the right pedal. Your two measurements should be identical.

    Sometimes (especially on cheaper bikes) the manufacturer won't match the bottom bracket to the cranks. They'll use whatever bottom bracket they can get cheaply - even if the pedals aren't symmetrically located.

    Having a gap between the crank and frame is common. There might be a similar gap on the right side - but you can't see it because the chainring and its mounting spider block the view.
    Laura

  5. #5
    Join Date
    Aug 2010
    Location
    Wilts, UK
    Posts
    903
    Thanks Laura, sorry for the late reply. I'll do that.
    Dawes Cambridge Mixte, Specialized Hardrock, Specialized Vita.

    mixedbabygreens My blog, which really isn't all about the bike.

 

 

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