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Offset bicycle crank boosts power

Comments

  • #2
    abcdggs
    Registered Users, Registered Users 2 Posts: 1,831 ✭✭✭abcdggs


    Haven't tried it but how can a crank add more power, there's no extra energy input. Goes entirely against conservation of energy


  • #3
    Qualitymark
    Closed Accounts Posts: 6,824 ✭✭✭Qualitymark


    That would be an ecumenical matter.


  • #4
    Lumen
    Registered Users, Registered Users 2 Posts: 31,222 ✭✭✭✭Lumen


    All eccentric crank/chainring systems have the same credibility problems, which are that

    (a) there is no means of measuring their effect on power that doesn't raise suspicions that they are gaming the power meter.
    (b) rider adaptation confounds the results


  • #5
    ford2600
    Closed Accounts Posts: 4,457 ✭✭✭ford2600


    http://www.noncircularchainring.be/pdf/Appropriate%20non-circular%20chainrings.pdf

    Some light reading on the matter...
    abcdggs wrote: »
    Haven't tried it but how can a crank add more power, there's no extra energy input. Goes entirely against conservation of energy


  • #6
    abcdggs
    Registered Users, Registered Users 2 Posts: 1,831 ✭✭✭abcdggs


    ford2600 wrote: »
    http://www.noncircularchainring.be/pdf/Appropriate%20non-circular%20chainrings.pdf

    Some light reading on the matter...
    Cheers for that. Evidently i was incorrect
    4.5. Concluding remarks
    The results of the study undeniable suggest that an optimization of the dynamic component of the joint loading in cycling, by the design of an appropriate non- circular chainring, provides objectively demonstrable advantages to the non- circular chainring compared to the conventional circular one. "Objectively demonstrable" means: correctly computable according to the physical laws of the kinematics and dynamics (kinetics).


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  • #7
    Lumen
    Registered Users, Registered Users 2 Posts: 31,222 ✭✭✭✭Lumen


    abcdggs wrote: »
    Cheers for that. Evidently i was incorrect

    "The authors are grateful to...Gaby Demeester, M.Sc.Mech.Eng., Lawyer and Patent Attorney for his advice on how to protect the content of this paper."

    :rolleyes:


  • #8
    ford2600
    Closed Accounts Posts: 4,457 ✭✭✭ford2600


    Not saying you were, have a degree in Mech Eng and I got bored a few pages in..
    abcdggs wrote: »
    Cheers for that. Evidently i was incorrect


  • #9
    abcdggs
    Registered Users, Registered Users 2 Posts: 1,831 ✭✭✭abcdggs


    I'm impressed you attempted to read it, i skipped to the findings. Seems from that there is definitely a strong case both in power output and reduce in joint stress, although i'm not sure how much difference it would actually make to you or me cycling to work every day.


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