You were given 3 riders (Gee Atherton, Rachel Atherton and Taylor Vernon, all of the Trek Factory DH Team), with 3 power output options each.
Actual Output Results:Gee Atherton - 1965
Rachel Atherton - 1343
Taylor Vernon - 1654
The winner for this round is
Summit Bike Club and MJ had this to say about winning a brand new Stages Power Meter:
| I lead the Summit Bike Club, a junior development organization based in Park City, Utah and will use the Stages power meter on my Pivot LES to learn more about my riding, which will give greater insight to instruct the kids. - MJ |
Stages Cycling makes power meters for all types of riders. Power meters are a training tool that helps cyclists get the most from their training, you may be surprised but many of the riders you follow through Pinkbike’s race coverage use Stages Power to maximize their performance. In Leogang, Stages Cycling collected samples of Max Wattage from the Trek Factory DH team. Max watts are a metric used to quantify sprint power.
Stages Power meter, valued up to $649.99 USD. (Saint M820 Stages Power meter pictured.
Thanks to
Stages Cycling and stay tuned for 2 more contests from them this season.
MENTIONS @trek
Competition failed just from the start, because
1. it wasn't said for what time average was power. It's really important, especially for stages.
For example, data from my stages for 2015: 1sec: 2133, 5sec (here and later - average): 1300, 10sec: 1217, 30sec: 782
You see, it's totally different.
2. you can't use 1sec, because it's wrong. That's why: you have power meter only for your left leg, standing sprint cadence in xc/dh is below 90. So power meter just don't have enough data! You will see your max power, if you will go with high cadence (100+) and will fast switch to the low cadence sprinting. Stages will think that now you have great power with old high cadence and will boost your figures.
That's why 1sec power means nothing.
Minimum, what's really means something is 5sec average power, but Gee don't have it at the level 1965, because its 24watts/kilo for him. Its Chris Hoys best level or higher) And more than that, for Chris it would be on a track. Its much harder two show your best power on dh/enduro bike because of the suspension non-circular soft style of pedalling (in comperison to road of track bike).
Will tell more about some statistics and power measurement if you want)
It looks as if they average the force of one pedal turn. Since only one leg is measured, they double the force.
The provided formulas look very strange to me. The power of a drive shaft should be calculated P=2*pi*F*r*n. I wonder why they use the gravitational constant g - makes no sense here.
In Addition, strain gauges in bridge circuit, probably wheatstone bridge, can easily cause wrong values. In highly dynamic cases, the evaluation isn't very reliable.
Assumptions: r=0.17m, 1 pedal turn per second n=1/s, P=1965
It takes constantly 188kg on the pedal to get this enormous power. In reality the force/mass on the pedal is not constant so it gets a bit tricky ...
The torque is the cross product Fxr. Assuming a vertical force on the pedal, the torque will be T=F*r*cos(alpha). Because of the 2 pedals the torque is T=F*r*|cos(a)|, where |x| is the abs function. The average value of abs(cos(a)) is the integral from 0 to 2pi divided by 2pi, which is 0,637. So the average mass value Mave=188kg is 63,7% of the maximum value. So my conclusion is that the maximum weight on the pedal has to be 295 kg.
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I wonder how a 70-80 kg person should bring nearly 300kg on the pedal!
The only problem is that stages can't measure 1sec power properly (and it's not a problem out of this post, because Stages is really nice at 10+sec measurements and that's appropriate for all of us).
In the topic we had competition about exactly that - 1sec power. Which is something like randomizer.
Although I dont think its strange that Gee could put down more power than a XC or road cyclist, neither bike is nowhere near as good to stand up and smash the pedals. Especially considering that Gee probably spends a bucket load more time training for hard short sprints.
No doubt these are strong folks, but I'm willing to bet these are the highest data point recorded, or at least just 1 second averages. Any shorter than 5 seconds and it should be considered noise in the signal.
So how about it? What were the 5 second bests and what did they average for their race runs?
Cheers!
For sure agree about the rest.
www.youtube.com/watch?v=S4O5voOCqAQ
just have a look. I dont see Gee with legs like this. that figure is definitely not accurate. I guess it depends on the resolution of the power meter readings. imagine screaming downhill generating serious impulses as you hit obstacles and then putting in a couple of revolutions of the crank......downhill is not the right place for power meters