Mountain Bikes · Public discussion

ETA: Does it really save any energy?

Started by Phil, Squid-in-Training · · Last activity · 5 posts · 474 views

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Mountain Bikes
Published
27 September 2005
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8 October 2005
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Phil, Squid-in-Training
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  1. (PeteCresswell) said:

    Marzocchi's ETA feature lets the rider lower a 100mm fork by about an
    inch and reduce the travel to an inch.

    I'm not sure whether the claimed benefit is change in bike attitude,
    less energy absorbed by bobbing, or both.

    But thinking about the bogging aspect, it seems like it might be a
    matter of longer travel through less resistance vs shorter travel
    through greater resistance. If that's true maybe the energy
    absorbed is a wash.

    Anybody?

    Work=Force*Distance. You're not exerting more force, and distance is
    smaller. Ergo, work is smaller. Work=Energy=Heat=Calories ~= Food

    http://en.wikipedia.org/wiki/Mechanical_work

    --
    Phil, Squid-in-Training

  2. "(PeteCresswell)" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Marzocchi's ETA feature lets the rider lower a 100mm fork by about an inch


    and

    Quoted message said:

    reduce the travel to an inch.

    I'm not sure whether the claimed benefit is change in bike attitude, less


    energy

    Quoted message said:

    absorbed by bobbing, or both.

    But thinking about the bogging aspect, it seems like it might be a matter


    of

    Quoted message said:

    longer travel through less resistance vs shorter travel through greater
    resistance. If that's true maybe the energy absorbed is a wash.

    Two different things here. First, with the fork compressed enough and a
    steady pedaling motion there will be no movement so no energy loss. Second,
    the difference in resistance between the two is minimal, the damping
    characteristics aren't that different at the two the levels and the spring
    rate is the same, just preloaded.

    Greg

  3. "Phil, Squid-in-Training" <[email hidden]> wrote in
    message news:mAj_e.122985$Ep.107755@lakeread02...

    Quoted message said:
    (PeteCresswell) said:

    Marzocchi's ETA feature lets the rider lower a 100mm fork by about an
    inch and reduce the travel to an inch.

    I'm not sure whether the claimed benefit is change in bike attitude,
    less energy absorbed by bobbing, or both.

    But thinking about the bogging aspect, it seems like it might be a
    matter of longer travel through less resistance vs shorter travel
    through greater resistance. If that's true maybe the energy
    absorbed is a wash.

    Anybody?

    Work=Force*Distance. You're not exerting more force, and distance is
    smaller. Ergo, work is smaller. Work=Energy=Heat=Calories ~= Food

    If he was thinking the way I think he was thinking then the force would be
    proportionally larger, but in reality it's not.

    Greg

  4. Marzocchi's ETA feature lets the rider lower a 100mm fork by about an inch and
    reduce the travel to an inch.

    I'm not sure whether the claimed benefit is change in bike attitude, less energy
    absorbed by bobbing, or both.

    But thinking about the bogging aspect, it seems like it might be a matter of
    longer travel through less resistance vs shorter travel through greater
    resistance. If that's true maybe the energy absorbed is a wash.

    Anybody?
    --
    PeteCresswell

  5. I'm running a 120mm MX Comp ETA and find that the ETA lockout does help
    significantly on climbs for both reasons you mention below.

    On 9/27/05 8:35 PM, in article [email hidden],

    (PeteCresswell) said:

    Marzocchi's ETA feature lets the rider lower a 100mm fork by about an inch and
    reduce the travel to an inch.

    I'm not sure whether the claimed benefit is change in bike attitude, less
    energy
    absorbed by bobbing, or both.

    But thinking about the bogging aspect, it seems like it might be a matter of
    longer travel through less resistance vs shorter travel through greater
    resistance. If that's true maybe the energy absorbed is a wash.

    Anybody?

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