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  1. #1
    aka baycat
    Reputation: Ryan G.'s Avatar
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    Power Curved Cranks...

    Was hoping for some Engrish but these awesome cranks will do. Anyone running them?

    via Bike Hugger



    "We have researched and road tested for the past 10 years and now we are very pleased to present you 2 types of power curved cranks. According to SGS Taiwan test report, power-curved crank canincrease 25~30% torque output between angle 0(upper dead point)~60.It has overcome technical difficulties on raising power efficiency in the bicycle industry for two centuries.

    Power-curved cranks use the design of golden spiral ratio, which create more pedaling efficiency than traditional cranks can provide, so that no matter bike lovers or normal riders can enjoy more fun of speed and comfortable riding. Also, its bright appearance and improved manufacturing process enhance the value and outstanding of the bicycle. For the purpose of meeting the commercialization, the power-curved cranks can be installed on any kind of bike without changing manufacturing process. Also, the power-curved cranks provide wider range of gear ratios for bicycle designing. In addition to those advantages, using power-curved cranks can increase 30% rotational momentum."

  2. #2
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    no because the leverage point is the same.

  3. #3
    workin' it Administrator
    Reputation: rockcrusher's Avatar
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    nice. How changing the shape of the arm increases output I don't understand but I can see how adding more material and using a square taper BB might be appealing to the Walmart bike buyer.
    Try this: HTFU

  4. #4
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    Crap. Also, it's been done.

  5. #5
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    Can't see how that would do anything.

    The leverage point is the same. The only difference is a small difference in the placement of mass, but I don't think that it would have any noticeable effect.

    If it did you could just place a weight somewhere on a standard crank set. It would have to be enough weight to give it a flywheel type of effect, and in order to be noticeable it would have to be more weight than you would want to add, and would probably make the pedal stroke feel herky jerky.

  6. #6
    Thread Killer
    Reputation: bucksaw87's Avatar
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    well...i could see a longevity thing. if you have a problem with snapping regular cranks; with these, it looks like the force follows the curvature of the arm, so the force would stay in the arm all the way down to the BB

  7. #7
    Masher
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    weigh?

  8. #8
    Stokeless Asshat
    Reputation: jeff's Avatar
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    "Power-curved cranks use the design of golden spiral ratio"

    Says it all right there. No need to discuss any further.
    Zip ties? Not on my bike!

    Want:
    650B rims or wheel set. 80's vintage 32 or 36 x 135mm

  9. #9
    not really an mtbr member
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    Quote Originally Posted by baycat
    In addition to those advantages, using power-curved cranks can increase 30% rotational momentum."
    Only because they weigh so much more!

  10. #10
    Xtreme Lounger
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    "All your torque are belong to us."

    -Som Ting Wong

  11. #11
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    Rotor has one that works

  12. #12
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    Designs like this come around every few years. They have zero benefit functionally, but are a good measure of the cultural memory span in the bike biz.

    In alternate years we get eliptical chainrings.
    fb
    www.chain-L.com

    The key to solving any problem is to understand and address the underlying cause.

  13. #13
    251
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    Dave
    Blog / Strava

  14. #14
    I Have Cookies
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    I say the shortest distance between two points is a straight line
    The most important thing is what God thinks about it. He will have the final say. Joshua Stinebrink

    ____
    Kimo

  15. #15
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    Quote Originally Posted by jeff
    "Power-curved cranks use the design of golden spiral ratio"

    Says it all right there. No need to discuss any further.

    the fibonacci curve is the "golden" curve

    yay for 11th grade math!

  16. #16
    Bicycle rider
    Reputation: ExigeS's Avatar
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    Who stole my BS meter? Post pics if you purchase and install it on you bike.

  17. #17
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    ya

    [SIZE="3"]The nine most terrifying words in the English language are, 'I'm from the government and I'm here to help.' --Ronald Reagan [/SIZE]

  18. #18
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    even better...

    I've created one that's even better, the no dead point at all crank...


  19. #19
    I Have Cookies
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    Spin people SPIN!!!!!!
    The most important thing is what God thinks about it. He will have the final say. Joshua Stinebrink

    ____
    Kimo

  20. #20
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    increase 2-3 km/per hour,
    The Revolution(s) Per Minute increases 2~3 RPM

    Torque output efficiency increasing 25~30% test by SGS

  21. #21
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    Where can I buy these.

    Will they work with 83mm bb?

    I jump to flat lots, how high can I jump with these?

  22. #22
    Stay thirsty my friends
    Reputation: 4JawChuck's Avatar
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    WTF they don't come in pink or purple? Everyone knows purple is the color of power...pffffft! Also according to Feng Shui the sprockets should be on the left side to provide life force balance, these guys are obviously amateurs if they don't understand these basic principles.

  23. #23
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    Looks like a boomerang.

  24. #24
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    Reading this thread, I just had a Brainstorm moment; why not bolt on THREE cranks, for a 50% torque increase?
    Brisbane, AU

  25. #25
    it's....
    Reputation: Strafer's Avatar
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    Quote Originally Posted by hootsmon
    Reading this thread, I just had a Brainstorm moment; why not bolt on THREE cranks, for a 50% torque increase?
    Would only work for black guys.

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