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Old 12-31-13, 08:30 PM   #1
Dunbar
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New to Power - Need Help Analyzing Data

Hey guys, I've done 3 rides with my new Powertap G3 and just trying to get a rough idea of what the data means. I plan to do an 20 minute FTP test when conditions allow but even a 20 minute uninterrupted effort is difficult where I live (west Los Angeles.) Am I missing something or does this data indicate my FTP is around 275-300 watts (5'9" 170lbs.)? I plan to start calibrating the Powertap every ride but the first time I did it the calibration value was 504 which is within the normal range.



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Old 12-31-13, 10:45 PM   #2
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FTP is an all out effort for 20min… I doubt you rode that hard for any of those 3 rides… FTP would best done on a trainer if you can't find some relatively flat to slightly uphill ride for 20min.

Looking at your chart 20min is about 200w.. not sure where you are getting 275-300
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Old 12-31-13, 11:47 PM   #3
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You may have an FTP of 275+ but the data you've got so far doesn't support that number. With a 275 FTP your 5min power should be 350+ and your 20min best effort should be at least 5% higher than 275. I wouldn't worry about it for now as it's not necessary for training or riding. Even if you are planning on a structured training plan it's not really necessary as your effort levels for particular intervals will be self-correcting.
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Old 01-01-14, 12:52 AM   #4
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Isn't the first graph Strava's version of the critical power curve? I thought I read where the power ramps up is around where your FTP is.

I was reading elsewhere on here that on the second graph (with the "buckets") where the power drops off noticeably your FTP is in the prior bucket. These are all estimates of FTP of course.

Sustained hard efforts have been hard to come by with the nice weather and the holidays. There have been too many people out-and-about where I ride to do a 20 minute interval uninterrupted.

Edit, these are the two threads where this information was discussed:

http://www.bikeforums.net/showthread...ribution-Chart

http://www.bikeforums.net/showthread...my-FTP-way-low

Last edited by Dunbar; 01-01-14 at 01:01 AM.
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Old 01-01-14, 09:51 AM   #5
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Quote:
Originally Posted by spdntrxi View Post
FTP is an all out effort for 20min…
Let's kill this before it goes any further. http://lists.topica.com/lists/wattag...?mid=910289158 http://alex-cycle.blogspot.com/2008/...adly-sins.html
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