Measuring Watts?
03-25-05, 12:30 PM
#1
"Great One"
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Measuring Watts?
I noticed a few of you die-hard racers can quote how much power you can put out. Galen_52657 has mentioned something called a roll-out test before.
How is this done? By using a powermeter hub? Is there any other way to do it?
How is this done? By using a powermeter hub? Is there any other way to do it?
03-25-05, 01:17 PM
#2
1/2 a binding 1/2 a brain
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You need a perfectly flat, smooth road to do a roll-out test. You can also use a hill (downhill) and then factor in the grade to the calculation. The hill isn't as good of a test since the exact grade at the point in time and space that the measurement is taken is needed to complete the calculation.
Yes, you need some sort of power measuring device like a powertap.
Yes, you need some sort of power measuring device like a powertap.
Last edited by telenick; 03-25-05 at 02:01 PM.
03-25-05, 07:38 PM
#3
Software for Cyclists
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FWIW, my CycliStats program estimates Average Watts for each ride. The calculation looks at a bunch of different variables, as can be seen on this screenshot:
https://www.shastasoftware.com/CycliS...calculator.htm
As long as the assumptions plugged into the equation are reasonably accurate, I believe the Average Watts estimate is in the ballpark. It won't be as accurate as a power meter...but, it doesn't cost $600 either :-).
If anyone out there trains with a power meter, I'd be very interested in hearing how the CycliStats estimates compare to your power meter results for Average Watts. You can download a free, fully functional, 30-day trial version of CycliStats from the website (https://www.CycliStats.com).
https://www.shastasoftware.com/CycliS...calculator.htm
As long as the assumptions plugged into the equation are reasonably accurate, I believe the Average Watts estimate is in the ballpark. It won't be as accurate as a power meter...but, it doesn't cost $600 either :-).
If anyone out there trains with a power meter, I'd be very interested in hearing how the CycliStats estimates compare to your power meter results for Average Watts. You can download a free, fully functional, 30-day trial version of CycliStats from the website (https://www.CycliStats.com).
Last edited by SSP; 03-25-05 at 10:13 PM.
03-25-05, 09:57 PM
#4
No one carries the DogBoy
My bike computer estimates watts based on grade/speed and the combined weight of of me and the bike. It doesn't adjust for wind, and I don't think its all that accurate, but its there. Ciclosport 436.
03-25-05, 10:05 PM
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So I guess it's either live with an estimate or shell out lots of money.
How much does the Ciclosport 436 cost?
How much does the Ciclosport 436 cost?
03-25-05, 10:51 PM
#6
No one carries the DogBoy
Don't remember. I think its in the 200 range with the cadnece unit. Wireless speed, wired cadence, alt., Power estimate. I'm not sure how much I belive it though. I did a ride today that is definately hilly, but it registered a max gradient over 20% on one of the steep sections of Barlow Rd. near Madison. I know its steep (I had to stand to keep moving in 30/25) but 20% is insane.
