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  1. #1501
    Ho-Jahm Hocam's Avatar
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    I have a question that's been nagging me for a bit.

    Pre-peak my FTP was estimated at 260 from a variety of sources (NP for races, 2x20' tests, 3' test).

    I peaked and raced a 22 mile hilly RR, NP 279 for the 1 hour race. Normally I wouldn't bother about ftp, but on the finishing climb I had a peak 10' of 317 watts with a 5' PR of 325 in the first five minutes, previous was 315.

    What the hell was going on? 10' seems way too long for VO2 kind of power.
    Race-o-meter:
    Broken until next season

  2. #1502
    Making a kilometer blurry waterrockets's Avatar
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    How did you test your 5' power when you got 315?

  3. #1503
    ..... Jynx's Avatar
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    most likely because a 5' climb was easier to maintain a higher power then 5' on a flat road?

  4. #1504
    RustyTainte substructure's Avatar
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    Maybe today with the Head Unit. Maybe.

  5. #1505
    Carpe Diem bdcheung's Avatar
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    i'm thinking about ditching power for this season
    "When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
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  6. #1506
    ..... Jynx's Avatar
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    reason?

  7. #1507
    Village Idiot
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    I'd go by the 280 number Hocam. That's race performance, but what was the VI, that might be important. Consider that before using 280.
    Truth, like light, blinds. Falsehood, on the contrary, is a beautiful twilight that enhances every object.
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  8. #1508
    Carpe Diem bdcheung's Avatar
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    Quote Originally Posted by Jynx View Post
    reason?
    Just to try training by a different method.
    "When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
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  9. #1509
    Making a kilometer blurry waterrockets's Avatar
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    Is power making you hate training?

  10. #1510
    Carpe Diem bdcheung's Avatar
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    I wouldn't say that, but riding without power these past weeks has been very refreshing.
    "When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
    ΛΧΑ ΔΞ179 - 15% off your first Hammer Nutrition order!

  11. #1511
    Ho-Jahm Hocam's Avatar
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    Quote Originally Posted by waterrockets View Post
    How did you test your 5' power when you got 315?
    It was from a race I think, I'll have to check when I get home.


    Quote Originally Posted by ridethecliche View Post
    I'd go by the 280 number Hocam. That's race performance, but what was the VI, that might be important. Consider that before using 280.
    VI was something like 1.2, so pretty up there which makes me doubt the FTP-bustness.

    Either way, I took a long break from riding and can definitely not produce those kind of numbers right now.
    Race-o-meter:
    Broken until next season

  12. #1512
    Making a kilometer blurry waterrockets's Avatar
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    Quote Originally Posted by Hocam View Post
    It was from a race I think, I'll have to check when I get home.
    Yeah, I don't see how anyone can have a true physiologically maximal effort in a race. At the end of a 5-minute test, I'd be completely out of the race from exhaustion (once they caught me). I know a couple people who's MMPs for 1' are from races, but I still think those numbers could be beaten with a dedicated test.

  13. #1513
    Village Idiot
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    Quote Originally Posted by Hocam View Post
    It was from a race I think, I'll have to check when I get home.




    VI was something like 1.2, so pretty up there which makes me doubt the FTP-bustness.

    Either way, I took a long break from riding and can definitely not produce those kind of numbers right now.
    For an effort like that, I think you allow yourself small recoveries which allow you to go over FTP again ala crits.

    it's time to build up again anyway. So start doing intervals at like 220 or 230 and keep moving them up every few weeks.
    Truth, like light, blinds. Falsehood, on the contrary, is a beautiful twilight that enhances every object.
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  14. #1514
    Genetics have failed me Scummer's Avatar
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    crap.. my PT is acting up extremely weird. I reset the headunit, took the battery out and cleared the memory and what not.
    The problem is this. I do a steady effort, maybe 180W or so and the current power shoots up to maybe 80W, then declines over a short period of time until it hits 0 and then stays 0. Very very odd. I experienced that problem yesterday for the first time.

    I think the next step is to take the batteries out of the hub and see if that does any good.

    Thomas
    Gelato aficionado.

  15. #1515
    Carpe Diem bdcheung's Avatar
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    it's a hub issue
    "When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
    ΛΧΑ ΔΞ179 - 15% off your first Hammer Nutrition order!

  16. #1516
    Genetics have failed me Scummer's Avatar
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    It sure was. Removed the hub batteries.. let it sit without batteries for a while, put it back in and voila.. 200W feel like 200W again.
    Gelato aficionado.

  17. #1517
    No matches Flatballer's Avatar
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    Quote Originally Posted by waterrockets View Post
    Here's the workout: http://www.trainingbible.com/joesblo...cing-post.html

    Note that when he says "CP60 from a race," he's talking about average power, not normalized power. Note also that I left out the 2 minute recoveries in my previous post -- tough workout.
    How do you view the average from the previous interval? If you set up the interval, is that what the average power shows at the top? I always thought it was just total average for the ride.

    So do I press INT before I start the interval, and then INT when it's over (10 minutes, 8 minutes, whatever), I check the average power on the top line, and it'll be the average of the last interval?

  18. #1518
    Making a kilometer blurry waterrockets's Avatar
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    Yeah, I go into interval mode by holding "mode" for 2s. That shows data for the current interval only. I use that to track my time in the current interval. Then, when the time is up, I press both buttons and start recovering. During that two minutes, I "mode" my way to the flashing "int," then hold "select" for two seconds, which goes into interval browse mode. Then I hit select until I loop back around to my previous interval (the current one is the current recovery). Then I look at average power and see where I ended up. "mode" back to the "int" line, and hold select for 2s to get back to seeing only the current interval. Press both buttons when the 2 minutes is up, and get rocking.

  19. #1519
    No matches Flatballer's Avatar
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    I'm gonna need to write myself a manual for all that.

    At least I learned something already. I didn't know about all that interval surfing stuff. I thought you could only look at intervals later, never knew you could view them on the bike. Pretty nifty.

  20. #1520
    Making a kilometer blurry waterrockets's Avatar
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    Yeah, it's all on page 14, here. I missed telling you about the "M" next to "int" which indicates you're browsing intervals.

  21. #1521
    RustyTainte substructure's Avatar
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    Should have my PowerTap back today. They were real quick to respond with my problem and sending out a new one. Only had to pay for shipping to them. Just awesome!

  22. #1522
    jfm
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    Hello. I purchased a new SRM power meter in late June of this year. The zero offset every morning has been in the mid 390's. Around Sept. 1 the Zero offset changed to 407 to 410. Today the zero offset is 457. No changes in temperature. I did ride in the rain the previous day but every thing worked fine this morning execpt the change in zero offset. Is this normal or do I need to have it checked? The zreo offset has now been stable for a week in the 460 range.

  23. #1523
    ..... Jynx's Avatar
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    Here is some info:

    SRM says that a zero offset change of 10 Hz would be about 1 watt.

    Q: My zero offset value has changed. Could this be a problem?

    A: It is normal for the zero offset to change. As long as the zero offset is between 100 and 600,
    the Powermeter will function correctly. Should the value lie above or below this, the Powermeter
    must be sent in to be checked.


    Q: Zero offset frequency shifting more than +/- 10 Hz:


    A: Possible causes:

    •The sensor position in relation to he PowerMeter's transmit coil may be less then optimum.More Information: Sensor Mounting [PDF - 1.3MB].

    •The PowerMeter has been moved from one temperature to another (i.e.. indoors to outdoors in the winter). This causes the metal to contract, and will change the zero offset frequency. For a crank with a fairly typical slope of 20.00 Hz/Nm, it is normal for the zero offset frequency to change about 7-8 Hz per degree Celsius. Solution: Allow the bike to acclimatise by leaving it outside for at least half an hour before riding. Check and set the zero offset frequency before the ride, and then recheck it after approximately 10 minutes to ensure that it has stabilised.

    •The chain ring bolts may be loose. This allows the chain rings to move slightly on the PowerMeter, and will distribute force through it differently. Solution: Check that the chain ring bolts are tight (use 6 to 10 Nm of force to tighten them). Tighten every second bolt in turn, as this creates more constant pressure on the O-ring seal inside the PowerMeter.

    •The crank bolts may be loose. It is very important that a thread lock product (i.e. blue Loctite) is used on these bolts, and that it is allowed to set before the cranks are used. Otherwise the bolts may loosen, which causes the zero offset frequency to become unstable. Solution: Remove the crank bolts, apply thread lock to the threads, and then reinsert the bolts. Tighten them with 6 to 10 Nm of force, and allow them to set for the time recommended on the package.

    •The washer in between the crank arm and the PowerMeter is inserted incorrectly, or has cracked. There are different sizes of washers for older cranks, and not all of them are interchangeable. If the wrong one is in place, the crank arm will not sit tightly on the PowerMeter, and the zero offset frequency will become unstable. It can also cause the crank bolts to snap. Solution: Make sure that the right washer is inserted, and that grease is applied to it's surfaces before it is put into place in the PowerMeter.

  24. #1524
    Village Idiot
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    Haha, oops. My zero offset has been at around 720 since I got it, but the numbers have matched up with computrainers and other devices.

    Whatever.
    Truth, like light, blinds. Falsehood, on the contrary, is a beautiful twilight that enhances every object.
    -Albert Camus

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  25. #1525
    Foot + Mouth = me aperez8264's Avatar
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    What is the FTP correlation to weight?

    Since my season ended a few weeks ago, I've done a little over indulging in booze and such(I make it a point to not drink during the season, but have been going out the past few weekends). I am doing an FTP test this week as I begin to move into my prep phase. Looking at my numbers over the last few weeks of easy rides, it seems i have lost around 20-30 watts.
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