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  1. #1
    Junior Member
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    anyone run < 160mm cranks?

    I am entertaining thoughts of building up a crankset with short short bulletproofs. Technically, reducing crank length and also decreasing gear-inches, proportionally, should produce the same amount of energy expended per gear inch right?

  2. #2
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    energy per gear inch?

    It will keep the gain the same if that is what you mean. You foot will move the same distance compared to how far the bike moves forward. You will have to spin very fast and not move your leg much though which is likely to be incredibly inefficient.

    Why do you want to do this?

  3. #3
    McNightrider
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    pedal strike??? low bb??

  4. #4
    thomas masini lives
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    small femur id say
    not a 2ksuck'r

  5. #5
    PKF jankon73's Avatar
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    I run 140's (bulletproof), believe it or not. Been riding on them for about 3 years.
    I like it because I can fall off of curbs and not have to care what position my feet are in. Zero pedal strike.
    Plus I spin. A lot. I like spin.
    I've also raced with them in a couple duathlons.

    I've also got regular 165s on other bikes, so I'm not THAT weird.

  6. #6
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    Give it a try! All ss/fgers know that you can get away with all kinds of improbable sounding ****, and this could be fun. Use rabbit or a similar gear calc to find equivalent gain ratios.

  7. #7
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    Quote Originally Posted by doofo
    small femur id say
    It's a perfectly nice size!

  8. #8
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by jankon73
    I run 140's (bulletproof), believe it or not. Been riding on them for about 3 years.
    I like it because I can fall off of curbs and not have to care what position my feet are in. Zero pedal strike.
    Plus I spin. A lot. I like spin.
    I've also raced with them in a couple duathlons.

    I've also got regular 165s on other bikes, so I'm not THAT weird.
    How tall are you?
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  9. #9
    PKF jankon73's Avatar
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    I'm an even 6' tall. Long legs.
    I dunno, it just feels better for me than 170/175/180s.

  10. #10
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by jankon73
    I'm an even 6' tall. Long legs.
    I dunno, it just feels better for me than 170/175/180s.
    That is really weird. Hope that works out for you in the long term.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  11. #11
    Crapzeit! mcatano's Avatar
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    My ladypal's bike has 155s. She's 4'11" and rides a 43cm frame w/ 650C wheels. They're a regular set of fluted campy pista cranks that were milled down for a jr racer... it seems to work for her.

  12. #12
    Senior Member
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    Here something interesting I found about crank while browsing around

    Why crank length is(n't) important.

    EDIT: If you combine this with sheldonbrown Crank and Gain ratio info it make sense

    http://www.sheldonbrown.com/cranks.html
    Last edited by DanPT; 06-14-07 at 01:35 PM.

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