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Power Output and Trainers

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Old 12-01-06, 09:40 AM
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Power Output and Trainers

Anyone know how accurate the power output readings on trainers (such as the ones below) are?

Travel Trac Millennium V
Nashbar 2006 Watt Master Mag
Nashbar 2006 Watt Master Fluid

Maybe not those trainers specifically, but just in a more general sense. Cheers.
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Old 12-01-06, 09:51 AM
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Mine (Nashbar WattMaster Fluid) says that my max sprint wattage is almost 900, which sounds about right.
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Old 12-01-06, 09:54 AM
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Originally Posted by munkyv22
Mine (Nashbar WattMaster Fluid) says that my max sprint wattage is almost 900, which sounds about right.
Realy? That seems a tad low, or maybe my trainer is reading high. My friend and I train on Cateye trainers. Some of you guys may remember these things, they are the ones that hold the front fork and all. On these, we can easily reach about 1300-1400 watts without standing up. Anyone have any idea how accurate these trainers are compared to others?
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Old 12-01-06, 09:59 AM
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Originally Posted by EdZ
Realy? That seems a tad low, or maybe my trainer is reading high. My friend and I train on Cateye trainers. Some of you guys may remember these things, they are the ones that hold the front fork and all. On these, we can easily reach about 1300-1400 watts without standing up. Anyone have any idea how accurate these trainers are compared to others?
Well, I have legs like tree trunks and can break 40 Mph in a flat sprint.... so somebody's numbers are off. (hopefully mine, but I suspect yours).

I've never checked my output on anything else. But I do know that I read an article about Floyd's miracle ride on stage 17 and it had his numbers and when I tried to duplicate those numbers I just about fell off the trainer quivering after about 45 minutes.
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Old 12-01-06, 09:59 AM
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Originally Posted by EdZ
Realy? That seems a tad low, or maybe my trainer is reading high. My friend and I train on Cateye trainers. Some of you guys may remember these things, they are the ones that hold the front fork and all. On these, we can easily reach about 1300-1400 watts without standing up. Anyone have any idea how accurate these trainers are compared to others?
The 900 seems more realistic...as you can't simulate a true cajones to the wall sprint on a trainer. If you're getting 1300-1400 seated, I'd be skeptical.
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Old 12-01-06, 10:01 AM
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if you can do 1300-1400 watts without standing up on a trainer (and assuming you don't weigh 275lbs) you should be winning just about every field sprint at the local crits.
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Old 12-01-06, 10:07 AM
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They're not at all accurate or precise. Spend the money on a better non-power measuring trainer.

Look into TruTrainer rollers or the Kurt Kinetic Pro.

The cheapest trainers that accurately measure power are the CycleOps 300PT at 1900 followed by the VeloDyne at 2400 and then the VeloTron at 4-7000(?).
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Old 12-01-06, 12:55 PM
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Kurt also sells a computer that calculates output from the roller speed of the Kurt Kinetic Trainer. Anyone tried it yet?
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Old 12-01-06, 02:33 PM
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Originally Posted by wakked1
Kurt also sells a computer that calculates output from the roller speed of the Kurt Kinetic Trainer. Anyone tried it yet?
I have it and will probably get to try it out sometime ove the next week. The problem I have with it is that I have no baseline. Overall, I really don't think the accuracy or inaccuracy is that important. Repetitive results are. So if the meter is off by 10 or even 20%, as long as it stays that way, you can still measure results and see if you are improving or not. For 50 bucks, I'm not expecting a powertap.
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