R
Ryan Cousineau
Guest
In article <[email protected]>, bbaka <[email protected]>
wrote:
> Robert Chung wrote:
> > bbaka wrote:
> >
> >>Robert Chung wrote:
> >
> >
> >>>Drivetrain losses aren't all that high. Here's a comparison of the SRM
> >>>and Power Tap (and the Polar) on the same bike:
> >>>
> >>>http://mywebpage.netscape.com/rechung/wattage/rosetta/rosetta.html
> >>
> >>That link is broken, at least for now.
> >
> >
> > Sigh. Nope, the link's not broken; yes, it's for one of those freebie
> > sites that's (ahem) underpowered. Usually, but not always, when you get a
> > "page not found" you can hit the reload current page button and it will
> > appear.
> >
> >
> >>>>Power at the wheel usually equals speed.
> >>>
> >>>No.
> >>>
> >>
> >>Really? So you are implying that more power reduces your speed? I think
> >>we were talking about level ground road biking with no wind. More power
> >>equals more speed in this universe. Negative power is possible with the
> >>brakes and that makes heat, which, again, is power.
> >>
> >>Please qualify your blanket 'No.'
> >
> >
> > In my universe, but perhaps not yours, roads aren't flat, the winds do
> > blow, speeds aren't constant, and position changes. We're talking about
> > on-bike power measuring devices. Why would you need such a thing if power
> > equals speed? All you'd need is a speedometer.
> >
> >
> I haven't seen a mention that this was just for indoor use and have seen
> a graph of power over a trip, so we need to be all talking about indoor
> or outdoor. Indoor is simple to put on a trainer so if that is the
> direction of the discussion, what is the big deal? How many people train
> indoors anyway???
> Bill Baka
Bill, I think you've now argued both sides of the argument. What Robert
is saying is that power, while a useful measure of a rider's ability, is
by no means the only factor in performance. Remember how we were talking
about the importance of aerodynamics? There are many cases where a rider
with superior power output over a TT has been beaten by a rider with
inferior power and better aerodynamics (through some combo of
positioning, equipment, and morphology).
Similarly, power to weight mattes more than power once the road turns
uphill, but even there aero matters more than you might think.
--
Ryan Cousineau, [email protected] http://www.wiredcola.com
Verus de parvis; verus de magnis.
wrote:
> Robert Chung wrote:
> > bbaka wrote:
> >
> >>Robert Chung wrote:
> >
> >
> >>>Drivetrain losses aren't all that high. Here's a comparison of the SRM
> >>>and Power Tap (and the Polar) on the same bike:
> >>>
> >>>http://mywebpage.netscape.com/rechung/wattage/rosetta/rosetta.html
> >>
> >>That link is broken, at least for now.
> >
> >
> > Sigh. Nope, the link's not broken; yes, it's for one of those freebie
> > sites that's (ahem) underpowered. Usually, but not always, when you get a
> > "page not found" you can hit the reload current page button and it will
> > appear.
> >
> >
> >>>>Power at the wheel usually equals speed.
> >>>
> >>>No.
> >>>
> >>
> >>Really? So you are implying that more power reduces your speed? I think
> >>we were talking about level ground road biking with no wind. More power
> >>equals more speed in this universe. Negative power is possible with the
> >>brakes and that makes heat, which, again, is power.
> >>
> >>Please qualify your blanket 'No.'
> >
> >
> > In my universe, but perhaps not yours, roads aren't flat, the winds do
> > blow, speeds aren't constant, and position changes. We're talking about
> > on-bike power measuring devices. Why would you need such a thing if power
> > equals speed? All you'd need is a speedometer.
> >
> >
> I haven't seen a mention that this was just for indoor use and have seen
> a graph of power over a trip, so we need to be all talking about indoor
> or outdoor. Indoor is simple to put on a trainer so if that is the
> direction of the discussion, what is the big deal? How many people train
> indoors anyway???
> Bill Baka
Bill, I think you've now argued both sides of the argument. What Robert
is saying is that power, while a useful measure of a rider's ability, is
by no means the only factor in performance. Remember how we were talking
about the importance of aerodynamics? There are many cases where a rider
with superior power output over a TT has been beaten by a rider with
inferior power and better aerodynamics (through some combo of
positioning, equipment, and morphology).
Similarly, power to weight mattes more than power once the road turns
uphill, but even there aero matters more than you might think.
--
Ryan Cousineau, [email protected] http://www.wiredcola.com
Verus de parvis; verus de magnis.