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  1. #1
    Dive Bomber
    Reputation: jackspade's Avatar
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    External BB crank - hollowtech for SS

    I got issue for ovaled crank with square tapered.

    I am just wondering if external BB crank doesn't get ovaled like the square tapered one? and is it getting lighter/spinnier on the same ratio with external BB?
    Last edited by jackspade; 12-03-2011 at 06:20 AM.

  2. #2
    The need for singlespeed
    Reputation: zaskaranddriver's Avatar
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    Which part is getting ovaled?

  3. #3
    mtbr member
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    The Shimano external crankset won't get ovalized since the left arm pinches onto the spindle. It's one of the reasons I like them so much.

  4. #4
    mtbr member
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    External BB cranks aren't going to ovalize at all and you'll find the spindle is stiffer, too.

  5. #5
    Dive Bomber
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    Thanks for the inputs.

    Other question, is it become lighter/spinny on the same ratio compare to square taper?
    The spindle diameter is bigger so I just curious is there any different in friction.

  6. #6
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    They can be lighter than square-taper set ups, particularly at the same price levels, but you won't find the perceived drag to be appreciably different. If you want low drag, buy ceramics and oil lube instead of grease. Your cranks will whiz like a TdF racer's.

  7. #7
    one chain loop
    Reputation: fishcreek's Avatar
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    i traded my shimano hones for deity bmx cranks for couple reasons:

    1. spindle is stiffer.
    2. chainline is more adjustable.
    3. can run smaller chainrings.
    4. can run bmx spiderless sprocket by HbC.

    nothing wrong with outboard bearing cranks, it is the easiest to install too, but its time for change for me, hopefully for better.
    everything sucks but my vacuum cleaner.

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