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Old 03-11-08, 07:47 PM   #1
king-tony
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Crits and power records

I raced my first crit with a power meter this weekend and am not sure what to do with the data. This was a 1km course with six turns and a hill. It was very technical and showed me how much I have to learn about crit racing and bike handling. My normalized power for the 25 min crit was 439 watts with an average of 415. This destroyed pretty much every power record I have except for 30s and 1min. What should I do with this data? Should I just delete it from WKO+? I did learn some things from the data - primarily that I wasted a lot of effort by not being smooth in the first half of the race. The second half of the race had an average normalized power of 52watts less than the first half with a faster speed and the second half contained my attack lap as well. What does everyone else do with the crit data from their power meter?

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Old 03-11-08, 07:57 PM   #2
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Isn't 439watts for 25min pretty good?
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Old 03-11-08, 08:00 PM   #3
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Uh, way more than *pretty* good.
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Old 03-11-08, 08:01 PM   #4
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. My normalized power for the 25 min crit was 439 watts with an average of 415.
That sounds god awfully high or very painful.....
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Old 03-11-08, 08:01 PM   #5
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That's what I meant.
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Old 03-11-08, 08:06 PM   #6
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What type of Meter are you using Tony?


EDIT....Powertap. I found your thread from the TT where you said:


"I check my PT to see how bad my performance was and then I started to realize how sucky my ride was. 1:06:46 for 40.1k, avg power of only 279 with normalized @ 292. Avg HR was 155 (LTHR for me is 156). Outbound power looked a little better at 290 avg and 302 normalized, but was still way off my FTP and what I thought I could do. I guess the gearing issue hurt me some, but I left feeling like I may have left some time out there."



302 normalized for a TT then getting 439 for a crit just does not sound right. I am not sure what I would do. Even if your hub was not zero'd out I don't think it would cause that big of a difference.
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Old 03-11-08, 08:12 PM   #7
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Isn't 439watts for 25min pretty good?
That is the point. When you are looking at your records you are generally wanting the power over the time period to be flat. The nature of a crit (at least this type of course is that there is a lot of on/off). So if you are sprinting up a short hill and avg 600 watts for 30 seconds and then do 200 watts down the back side it gives you an average of 400 for the time period. Power curves (at least as I use them) help me to know how long I can hold a certain wattage. So if I want to attack or try to bridge or even a short TT I know how long I can hold a wattage. This crit data is not reflective of my power (my real power is much lower than this for everything from 2-20 minutes). Here is what the file looks like unless the PT is malfunctioning from the previous day's icy time trial I assume it is accurate.

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Old 03-11-08, 08:15 PM   #8
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So if you are sprinting up a short hill and avg 600 watts for 30 seconds and then do 200 watts down the back side it gives you an average of 400 for the time period.
Assuming you go as fast up as you do down...
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Old 03-11-08, 08:17 PM   #9
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Minimum power was 67watts........
I am thinking you need to calibrate BIG TIME Tony.
I think....again think....that all your numbers will be 67 watts to high
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Old 03-11-08, 08:23 PM   #10
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Minimum power was 67watts........
I am thinking you need to calibrate BIG TIME Tony
I am thinking you are right. I stuck it on the bike right now and spun it up. It did drop back to zero, but probably 4-5 seconds after I quit spinning the pedals.
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Old 03-11-08, 08:25 PM   #11
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I am thinking you are right. I stuck it on the bike right now and spun it up. It did drop back to zero, but probably 4-5 seconds after I quit spinning the pedals.

That is ok...It takes a few seconds. But from the looks of your record it never went to zero even before you started.
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Old 03-11-08, 08:32 PM   #12
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That is ok...It takes a few seconds. But from the looks of your record it never went to zero even before you started.
My cadence never dropped below 40 either. I cleared it just before the start so my warm-up data is not on there. Would the sampling time cause this? I zeroed the hub just now and it is seems to be doing exactly as it was before. When I look at my cool-down data it does not show the power dropping below 13 or the cadence below 31. Hope my hub is not fried...or I guess frozen may be more accurate.
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Old 03-11-08, 08:36 PM   #13
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My cadence never dropped below 40 either. I cleared it just before the start so my warm-up data is not on there. Would the sampling time cause this? .
Max sampling is what.....4 seconds? I wouldn't think so. Maybe it was a fluke or maybe there were some high tension wires near by. Hop on the trainer and do 30 minutes with intermittent power and coasting and see what it looks like. Wish I could be of more help.
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Old 03-11-08, 08:49 PM   #14
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Max sampling is what.....4 seconds? I wouldn't think so. Maybe it was a fluke or maybe there were some high tension wires near by. Hop on the trainer and do 30 minutes with intermittent power and coasting and see what it looks like. Wish I could be of more help.
You were a big help actually. If you had not said anything I would most likely have continued to use bad data. I'll call Saris and see what they have to say.
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Old 03-11-08, 08:50 PM   #15
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I would forward your WKO data to Slipstream but thats me.
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Old 03-11-08, 09:00 PM   #16
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I would forward your WKO data to Slipstream but thats me.
I look terrible in argyle. I think I'll send it to Mr. Ball.
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Old 03-11-08, 09:25 PM   #17
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Look at some of the FAQ's on Saris site for troubleshooting and zeroing torque. Or look up the stomp test on the google wattage forums to check the calibration. One would guess that at some point during the race you stopped pedaling, if only for a few seconds, which is why the non-zero crank and hub torque would indicate that something was wrong with the hub. It may just be a torque reset. I do mine once a week just to be safe.

I would think 440w average would net you a win in the 4's too.
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Old 03-11-08, 09:41 PM   #18
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zero the torque. My PT always runs high when it's cold outside. Zero the torque and everything will be fine. You can even do this while you're riding as long as you have some time to coast.

Interestingly enough, the PT can zero itself if it's reading too low. It knows that there can't be a negative torque, so it can zero itself in that case.

If it's reading high though, there's no way for the PT to know.

Look at your torque while you're coasting. If it isn't zero, that's proof of your issue.

Looking at your power while coasting isn't the same thing, and it won't be helpful.
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Old 03-11-08, 10:07 PM   #19
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Yes, zero your torque. With the chain slack, press the left button until you're on the Watts line, press and hold the right button until the "watts" starts to blink. This will be torque mode, and the displayed number should be zero. I'm guessing it won't be. If it displays 35, for example, that's the amount of torque it added to every reading. You can actually write down this number and use a spreadsheet to subtract this amount from your torque readings to correct your power, if you're really concerned with saving the race data.

Anyway, now press and hold the right button again until it reads zero. Release and press the right button briefly to make the "watts" stop blinking and go back to power display. You've just zeroed the torque; you can do this coasting as well as long as the chain's slack.
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Old 03-11-08, 10:30 PM   #20
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How much do you weigh? While it seems that either your threshold power is off, or your zeroing was wrong, just looking at the graph and shifting it down 70 watts would still be an amazing effort, though if you are a big guy, maybe not so much. Nice job with both races.
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Old 03-12-08, 03:36 AM   #21
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Assuming non-zero torque, you can still get good data out of it if you weren't spinning at *some* point - say, even at the end of the race.

Port it to excel, subtract the offset torque from the recorded torque, and re-calculate the power.
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Old 03-12-08, 05:34 AM   #22
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How much do you weigh? While it seems that either your threshold power is off, or your zeroing was wrong, just looking at the graph and shifting it down 70 watts would still be an amazing effort, though if you are a big guy, maybe not so much. Nice job with both races.
I weigh 195#.
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Old 03-12-08, 05:36 AM   #23
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Thanks for all the help guys. I've got a 4 minute climb near my house that I have a lot of data on. I'll ride that after re-zeroing the PT and see what it says. I hope it was just the cold weather and that I won't have to send it back.
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Old 03-12-08, 05:51 AM   #24
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I raced my first crit with a power meter this weekend and am not sure what to do with the data. This was a 1km course with six turns and a hill. It was very technical and showed me how much I have to learn about crit racing and bike handling. My normalized power for the 25 min crit was 439 watts with an average of 415. This destroyed pretty much every power record I have except for 30s and 1min. What should I do with this data? Should I just delete it from WKO+? I did learn some things from the data - primarily that I wasted a lot of effort by not being smooth in the first half of the race. The second half of the race had an average normalized power of 52watts less than the first half with a faster speed and the second half contained my attack lap as well. What does everyone else do with the crit data from their power meter?

Thanks
Make graphs and post them on bf.net??

And all though it's just HR data, I'll oblige.

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Old 03-12-08, 07:24 AM   #25
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http://www.midweekclub.ca/powerFAQ.htm#Q46
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