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  1. #1
    Carpe Diem bdcheung's Avatar
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    Watts in Spin Class



    Tom Danielson averages 408 watts in "Spin class". insane!
    "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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  2. #2
    Used to be a climber.. GuitarWizard's Avatar
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    Man I wish I could afford an SRM
    1999 Trek 2500 - hit by a car on it in May, 2011 and currently bikeless

  3. #3
    base training heretic Squint's Avatar
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    His SRM is displaying current, not average power, on its screen. If it was showing average, it would say AVR in the upper left corner.

    Even TD can't sustain that much power indoors. Riding indoors without a massive amount of air movement will cut your power output by 1/3 to 1/2. 400W of power to the rear wheel means the body has to dissipate 1200W of heat.

    That's why I call BS whenever I hear about people burning 1000 Cal per hour (277W) in spinning class. There are probably only a handful of people in this country that could do that indoors with little to no cooling. Yeah, and they all hang out on bikeforums.net or are the teammate of someone on BF.

  4. #4
    I-M-D bell curve of bikn'
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    ^^^ Someone woke up grouchy
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  5. #5
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    Quote Originally Posted by Squint
    Even TD can't sustain that much power indoors. Riding indoors without a massive amount of air movement will cut your power output by 1/3 to 1/2. 400W of power to the rear wheel means the body has to dissipate 1200W of heat.

    That's why I call BS whenever I hear about people burning 1000 Cal per hour (277W) in spinning class. There are probably only a handful of people in this country that could do that indoors with little to no cooling. Yeah, and they all hang out on bikeforums.net or are the teammate of someone on BF.
    1/3 to 1/2. B.S.

  6. #6
    base training heretic Squint's Avatar
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    Quote Originally Posted by shawneebiker
    1/3 to 1/2. B.S.
    Indoors at 60-70F with no moving air, you will be sweating like a hog after riding even L1 for 10 mins.

    I haven't read it myself but I remember someone mentioning a study where world class cyclists were made to ride indoors sans cooling at a power output they could sustain for 30-60 mins outdoors. They crapped out after just a few minutes.

  7. #7
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    Quote Originally Posted by Squint
    Indoors at 60-70F with no moving air, you will be sweating like a hog after riding even L1 for 10 mins.

    I haven't read it myself but I remember someone mentioning a study where world class cyclists were made to ride indoors sans cooling at a power output they could sustain for 30-60 mins outdoors. They crapped out after just a few minutes.
    Maybe if your riding in a sauna. My basement is 68 degrees pretty much year round. L1 for 10 minutes isn't enough to even break a sweat without a fan. I do ride L4 with a small fan and I can sustain 260 watts for an hour but that is my current FTP.

  8. #8
    Outgunned and outclassed
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    I have no powermeter, but by comparing cycleops power estimates with calculated power for outdoor riding (niether of which are particularly accurate) I find I can produce slightly less power indoors (maybe 10%).

    However, the online power calcuators are known to greatly overestimate power output, so who knows.
    Patience - Consistency - Motivation

    I literally put our 9.11 watts/kg for 12 hours.

  9. #9
    Climbing Above It All BikeWNC's Avatar
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    I use two fans when on the trainer. I still need a towel to mop up the sweat. I hate riding indoors.
    FS: Shimano DA 7900 brake calipers, DA 7900 Crankset 50/34 175mm and BB

  10. #10
    Aut Vincere Aut Mori Snuffleupagus's Avatar
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    Quote Originally Posted by Squint
    His SRM is displaying current, not average power, on its screen. If it was showing average, it would say AVR in the upper left corner.

    Even TD can't sustain that much power indoors. Riding indoors without a massive amount of air movement will cut your power output by 1/3 to 1/2. 400W of power to the rear wheel means the body has to dissipate 1200W of heat.

    That's why I call BS whenever I hear about people burning 1000 Cal per hour (277W) in spinning class. There are probably only a handful of people in this country that could do that indoors with little to no cooling. Yeah, and they all hang out on bikeforums.net or are the teammate of someone on BF.
    I'll say that's about right...a bit extreme given the data I see though.

    At similar percieved exertion levels for one hour, I'm putting out around 700kj indoors, and 900kj outdoors. Something I believe contributes to that is that up the shorter roller climbs around here I'll be putting out 500-700ish watts, and on the trainer I hardly ever exceed 350 watts, as I've got to be spinning like a mad man, even on max resistance to get up to 600ish.

  11. #11
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    Quote Originally Posted by Snuffleupagus
    I'll say that's about right...a bit extreme given the data I see though.

    At similar percieved exertion levels for one hour, I'm putting out around 700kj indoors, and 900kj outdoors. Something I believe contributes to that is that up the shorter roller climbs around here I'll be putting out 500-700ish watts, and on the trainer I hardly ever exceed 350 watts, as I've got to be spinning like a mad man, even on max resistance to get up to 600ish.
    Apples and oranges, unless you use the same bike indoor and outdoor with the same PM.

  12. #12
    You got Madoned! munkyv22's Avatar
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    I use a big-ass industrial fan pointed right at me on the trainer. Doing intervals indoors, I still look like I just got out of the shower after the 3rd 10 minute set at zone 5.
    2006 Trek Madone SL 5.2
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  13. #13
    Senior Member?
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    Quote Originally Posted by shawneebiker
    Apples and oranges, unless you use the same bike indoor and outdoor with the same PM.

    I've trained w/ my bike and a powertap and agree with the posts here. Same bike and Powermeter, but I'm dealing with a LT around 270 watts indoors (my guess) instead of 320 outside (tested). I am glad to hear that it's a known effect, and I'm not just being a wuss.

  14. #14
    bzzzz fuzzthebee's Avatar
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    Quote Originally Posted by munkyv22
    I use a big-ass industrial fan pointed right at me on the trainer. Doing intervals indoors, I still look like I just got out of the shower after the 3rd 10 minute set at zone 5.
    I use an industrial fan also. It's about as powerful as a small plane I can produce equal if not more power indoors. I sweat, but the fan is so strong that a drop rarely hits the floor. And, for the record, last saturday I did 3101 kJ of work in 3:04 @ 85% of my FTP. (1011 kJ/hr)

  15. #15
    Senior Member Duke of Kent's Avatar
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    Quote Originally Posted by fuzzthebee
    I use an industrial fan also. It's about as powerful as a small plane I can produce equal if not more power indoors. I sweat, but the fan is so strong that a drop rarely hits the floor. And, for the record, last saturday I did 3101 kJ of work in 3:04 @ 85% of my FTP. (1011 kJ/hr)
    Indoors, I can't do more than ~10 minutes at my usual 20-25min test wattage without burning up. I've never felt that feeling on the road, even on days when it was 105*F outside. So I back it down a notch and try to go as long as possible without overheating.
    "If a non personal post makes you feel as if you've been attacked, maybe the problem IS you."

  16. #16
    Aut Vincere Aut Mori Snuffleupagus's Avatar
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    Quote Originally Posted by shawneebiker
    Apples and oranges, unless you use the same bike indoor and outdoor with the same PM.
    It's the same rig, just hooked up to a mag trainer.

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