Thread: iBike?
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Old 05-27-10 | 12:06 PM
  #79  
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waterrockets
Making a kilometer blurry
 
Joined: May 2006
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Originally Posted by fa63
Well, your assertion made me break out the spreadsheet and play with some numbers. I grabbed this kilo power profile from analyticcycling.com:

http://analyticcycling.com/DiffEqMotionKilo_Page.html

If the first five seconds of the power readings were off by 20% in one direction for the iBike unit, the overall impact on the average power over the 60-sec interval would be around 3%. I think this is a reasonable variation; near the claimed accuracy of a PT.
It's not that smooth. Check here to see what I'm talking about: http://www.bikeforums.net/showthread...I%99-look-like

It's a big ~1400W-1500W blast followed by a pretty quick drop. The blast at the beginning is the difference between 675W and 825W for me (Cat 3 vs. Domestic Pro on the e-wang chart).
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