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  1. #1
    Senior Member bidaci's Avatar
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    Pace Line speed vs Time Trail speed

    I am going to try my hand at Time Trials this year and am curious as to how your pace line speeds compare to your TT speeds.
    Bill

    - Serotta Columbus III - Aegis Trident SS TT - Trek 8000zx -

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    Quote Originally Posted by bidaci View Post
    I am going to try my hand at Time Trials this year and am curious as to how your pace line speeds compare to your TT speeds.
    About 25% less power for a group of 4 rotating equally.
    http://www.midweekclub.ca/articles/broker98.pdf

  3. #3
    going roundy round wanders's Avatar
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    +1 on 20-25% faster. More indicative of my sorry TT ability.
    Quote Originally Posted by CastIron View Post
    Damn.

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    Quote Originally Posted by wanders View Post
    +1 on 20-25% faster. More indicative of my sorry TT ability.
    25% less power, not faster.

  5. #5
    Eternal Cat3 Rookie branman1986's Avatar
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    only minorly correlated

  6. #6
    Aut Vincere Aut Mori Snuffleupagus's Avatar
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    You can't reasonably compare the two without more information.

    If I'm sucking wheel at the back of a 75 man road race, 30mph on a flat feels like a recovery ride. If I'm rotating with one or two other guys at 30mph, I'm not going to last more than a few miles before I make a shrill noise that apparently sounds something like "ka-powie!" and limp home with my tail between my legs.

  7. #7
    Making a kilometer blurry waterrockets's Avatar
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    Quote Originally Posted by asgelle View Post
    25% less power, not faster.
    +1 this is an important factor

    Figure 25% power savings results in about a 2.9% speed increase, if my cube-root math is correct. So, if you TT at 27mph, and paceline with the same bike, work smoothly, and have equal abilities, you can expect 27.8 mph or so for two people.

  8. #8
    Senior Member?
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    I'd also argue that the up&down of pacelining would allow you to push past LT while leading, and recover in the draft, allowing faster speeds overall no?

    I understand the physics, but I think physiology comes into play too.

  9. #9
    slow up hills kudude's Avatar
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    How good are you at your pack skills? If you leave huge gaps (watch me ride sometime ), then 26 in a group feels like 22 solo, but if you're in a good spot -- softpedalling seems to happen a lot.
    Quote Originally Posted by mr_tom View Post
    Cycling isn't a sport. It's more like a really, really expensive eating disorder.

  10. #10
    road rash/tree burn
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    Quote Originally Posted by Snuffleupagus View Post
    You can't reasonably compare the two without more information.

    If I'm sucking wheel at the back of a 75 man road race, 30mph on a flat feels like a recovery ride. If I'm rotating with one or two other guys at 30mph, I'm not going to last more than a few miles before I make a shrill noise that apparently sounds something like "ka-powie!" and limp home with my tail between my legs.
    KAPOWIE!! You just sold a car!

    Bit of an inside joke for those of us living near a Johnson Automotive dealership...


  11. #11
    Aut Vincere Aut Mori Snuffleupagus's Avatar
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  12. #12
    I miss my bike. GatorFL's Avatar
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    Quote Originally Posted by Snuffleupagus View Post
    I don't get it.
    ex-poor-fessional tri-geek.

  13. #13
    road rash/tree burn
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    Quote Originally Posted by GatorFL View Post
    I don't get it.
    This'll help:
    http://www.youtube.com/results?searc...e&search_type=

  14. #14
    pan y agua merlinextraligh's Avatar
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    Net Net is you can't pace or predict your TT speed off of group ride averages.

    Do some 2x20 intervals and you'll start to get an idea of what your TT pace should be.

    Also, using a power meter, or a HRM helps.

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