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  1. #1
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    Crank spindle life

    I like to keep bikes and parts working for as long as possible. So having ridden the outboard bearing crank system for a year now, I got to wondering when or if the spindle bearing contact surface might wear down so that it is no longer useable. Possible(?) scenario: cranks start creaking after 2000+ miles; replace bb; cranks still creaking.

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    If the spindle wears out, your cranks are burnt toast. Has anyone seen this or had this happen? Also good to know if you were to purchase a used crankset.

    Some bmx cranks have a replaceable spindle. Haven't seen any mtb cranks like this, but maybe they are out there...
    See below.

    Crank spindle life-cranks_device-cross-thumb_800.jpg


    Thx
    urmb
    Over every mountain there is a path, although it may not be seen from the valley.
    Theodore Roethke

  2. #2
    I Tried Them ALL... Moderator
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    Crank spindle life-picture-001.jpgI've put well over 4000 trail miles on my 2004 Shimano XTR FC-M960 crankset...and it's still quiet as a church mouse. Mind you - I have also gone through five outboard BB bearings, two granny rings, one middle ring. Yet the spindle contact surface remains smooth as a baby's butt(I always grease that thing liberally!).

    My initial $450 investment has paid for itself 3x already. It has since retired to commuting duties...
    "The mind will quit....well before the body does"

  3. #3
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    The inner race of the bottom bracket bearing spins with the crank spindle. The spindle should not be a wearing part and should last indefinitely.

  4. #4
    I Tried Them ALL... Moderator
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    ^What he said...nearly zero friction, means the spindle is fine, even after 100,000 miles.
    "The mind will quit....well before the body does"

  5. #5
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    The only time I've seen what you describe is when water infiltrates the bottom bracket and causes rusting to the spindle. In other words, only neglect can cause it.

  6. #6
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    Thanks all for your comments. Good point Slash5.
    Quote Originally Posted by Slash5 View Post
    The inner race of the bottom bracket bearing spins with the crank spindle. The spindle should not be a wearing part and should last indefinitely.


    Thanks
    urmb
    Over every mountain there is a path, although it may not be seen from the valley.
    Theodore Roethke

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