• Re: More bicycle efficiency tech

    From Roger Merriman@21:1/5 to Zen Cycle on Mon Dec 30 16:38:28 2024
    Zen Cycle <funkmaster@hotmail.com> wrote:
    On 12/27/2024 1:50 PM, AMuzi wrote:
    We converse often here about considering the bicycle+rider as a unit for
    aerodynamics, for total mass, when looking at CG in a corner, etc.

    Here, some further thoughts on that complete unit as regards vibration
    and heat losses:
    https://www.renehersecycles.com/the-missing-link-suspension-losses/

    I find Heine's blog posts interesting and informative, but he usually
    makes some claim that I just roll my eyes at. This time it's "In the
    past, 4 bar (58 psi) would have been a sign that the tire was losing air
    and almost flat—time for an urgent wheel change. Today that’s the pressure Tadej Pogačar runs on the road."

    um....no.

    Very few pros run pressure that low unless they're racing gravel or
    terrain they expect to be rough (Strada Bianchi, Paris Roubaix,....),
    and even then...

    Strada Bianche 2023 From https://velo.outsideonline.com/road/road-racing/strade-bianche-tech-the-tires-and-pressure-the-pros-raced-with-over-the-white-roads/

    "Tadej Pogačar, for example, raced on 28mm tubeless tires, with 4.9bar (71psi) on the front and 5.2bar (75psi) on the rear tire. "

    "Greg Van Avermaet...5.5bar (80psi) and 5.8bar (84psi)"

    "Quinn Simmons (Trek-Segafredo)...4.4bar (64psi) in the front, and
    4.8bar (69.5psi) in the rear."

    "Tim Wellens.... 4.1bar (59.5psi) and 4.8bar (69.5psi),"

    Heine apparently got that information from this article:

    https://www.cyclist.co.uk/in-depth/tadej-pogacar-bike-2

    Which rather sublty simply lists the pressure in the "spec" table:

    "Tyres Continental GP5000 TT TLR 28mm 55-58 PSI". with no supporting reference.

    Considering Outside got the information from actually interviewing
    people versus Rene Herse which is essentially hearsay, I'll take the
    Heine article with a grain of salt, as usual.

    He does like to self promote rather and does the opinions presented as fact etc.

    Roger Merriman

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  • From AMuzi@21:1/5 to All on Fri Dec 27 12:50:07 2024
    We converse often here about considering the bicycle+rider
    as a unit for aerodynamics, for total mass, when looking at
    CG in a corner, etc.

    Here, some further thoughts on that complete unit as regards
    vibration and heat losses: https://www.renehersecycles.com/the-missing-link-suspension-losses/
    --
    Andrew Muzi
    am@yellowjersey.org
    Open every day since 1 April, 1971

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  • From Zen Cycle@21:1/5 to AMuzi on Fri Dec 27 14:46:36 2024
    On 12/27/2024 1:50 PM, AMuzi wrote:
    We converse often here about considering the bicycle+rider as a unit for aerodynamics, for total mass, when looking at CG in a corner, etc.

    Here, some further thoughts on that complete unit as regards vibration
    and heat losses: https://www.renehersecycles.com/the-missing-link-suspension-losses/

    I find Heine's blog posts interesting and informative, but he usually
    makes some claim that I just roll my eyes at. This time it's "In the
    past, 4 bar (58 psi) would have been a sign that the tire was losing air
    and almost flat—time for an urgent wheel change. Today that’s the
    pressure Tadej Pogačar runs on the road."

    um....no.

    Very few pros run pressure that low unless they're racing gravel or
    terrain they expect to be rough (Strada Bianchi, Paris Roubaix,....),
    and even then...

    Strada Bianche 2023 From https://velo.outsideonline.com/road/road-racing/strade-bianche-tech-the-tires-and-pressure-the-pros-raced-with-over-the-white-roads/

    "Tadej Pogačar, for example, raced on 28mm tubeless tires, with 4.9bar
    (71psi) on the front and 5.2bar (75psi) on the rear tire. "

    "Greg Van Avermaet...5.5bar (80psi) and 5.8bar (84psi)"

    "Quinn Simmons (Trek-Segafredo)...4.4bar (64psi) in the front, and
    4.8bar (69.5psi) in the rear."

    "Tim Wellens.... 4.1bar (59.5psi) and 4.8bar (69.5psi),"

    Heine apparently got that information from this article:

    https://www.cyclist.co.uk/in-depth/tadej-pogacar-bike-2

    Which rather sublty simply lists the pressure in the "spec" table:

    "Tyres Continental GP5000 TT TLR 28mm 55-58 PSI". with no supporting
    reference.

    Considering Outside got the information from actually interviewing
    people versus Rene Herse which is essentially hearsay, I'll take the
    Heine article with a grain of salt, as usual.

    --
    Add xx to reply

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