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Has anybody tried the Stages (crank) power meter?

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Has anybody tried the Stages (crank) power meter?

Old 02-06-13, 07:18 AM
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Gluteus
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Has anybody tried the Stages (crank) power meter?

I think the pre-ordered units were suppossed to be available for shipping about 2 weeks ago.
Has anyone used it? Any comments/opinions?
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Old 02-06-13, 07:29 AM
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Looking forward to some reviews, I'm planning on getting one for my TT bike. That will have me using three different pt's on three bikes.
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Old 02-06-13, 07:39 AM
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The DC Rainmaker review was fairly disappointing. I am waiting for a bit more information before I decide yea/nay.
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Old 02-06-13, 10:42 AM
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It's going to be difficult to determine if this powermeter is suitable for you unless you already own a powermeter. Without knowing whether you put out balanced L/R power on a consistent basis the power output from the stages meter could vary significantly even though your overall power doesn't change.
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Old 02-06-13, 12:02 PM
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For me, based on the Power Balance data I get on my Quarq, the overall power from a ride would likely be off a bit, but the power for intervals and hard efforts wouldn't be thrown off much by the one sided power.

What I've found with Power Balance for me is that for moderately hard effort, (anything from a bit below tempo on up) my power balance is close to 50%-50% and is rarely off by more than .5%

However, just crusining around it can vary 3-4%, sometimes more, with the left half of the pedal stroke being lower, but not always. So in some files, I'll see for the whole ride a power split like 49-51, but other rides 46-54, and it appears to vary on how hard I'm riding.

One caveot here is that the Quarq power balance data is not truly independent; it takes a revolution and divides in half, so the left half is measuring the left down stroke, and the right up stroke.

For me at least, it would appear that measuring only one side would create some distortion in the data, particularly at lower outputs. YMMV.
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Old 02-06-13, 12:50 PM
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If I do get one I'm looking forward to removing the left crank arm from my quarq and trying both cranksets at the same time. I look forward to seeing the difference.
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Old 02-06-13, 12:58 PM
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coggan was less than kind to stages, so ill take it as a big fat no for any reason to buy it.
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Old 02-06-13, 01:03 PM
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Yeah, it sounds like it's a quarter step better than an iBike.

--note that I'd still like to use an iBike as a head unit for a real PM though, for the mobile wind tunnel stuff.
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Old 02-06-13, 01:15 PM
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The balance thing is 100% expected from the design -- what disappointed me most was the apparent failure to accurately measure the dynamics. I don't want to see a power spike where there isn't one. Maybe they just need to dial in their algorithms a bit more to damp those out.
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Old 02-06-13, 02:25 PM
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The in-depth review is here: https://www.dcrainmaker.com/2013/01/s...th-review.html

if you haven't seen it already. Basically the price point is attractive but there are some accuracy issues likely due to being left crank only multiplied by 2.
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Old 02-06-13, 04:04 PM
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Originally Posted by jsutkeepspining View Post
coggan was less than kind to stages, so ill take it as a big fat no for any reason to buy it.
I'd be interested in reading his thoughts on it. Couldn't find his comments online. Do you have a link handy?
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Old 02-07-13, 09:06 PM
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Im hoping the problems in the initial reviews turn out to be something that can be fixed. I cant afford the quarq or srm and I dont really want the powertap due to having to change out my wheels. The $600 price points looks real good
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Old 02-07-13, 10:19 PM
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Originally Posted by merlinextraligh View Post

What I've found with Power Balance for me is that for moderately hard effort, (anything from a bit below tempo on up) my power balance is close to 50%-50% and is rarely off by more than .5%

However, just crusining around it can vary 3-4%, sometimes more, with the left half of the pedal stroke being lower, but not always. So in some files, I'll see for the whole ride a power split like 49-51, but other rides 46-54, and it appears to vary on how hard I'm riding.

For me at least, it would appear that measuring only one side would create some distortion in the data, particularly at lower outputs. YMMV.
I've noticed the same. I have a Quarq as well, so it might be an influence. If i'm just noodling around, my power balance is way off. During the beginning of my ride it's usually pretty unbalanced as well. It takes me about a mile to get out of an urban area and onto some longer stretches of road without lights every 200 ft. After I get out of my stop/start zone, it's pretty even. Most rides end up pretty close to 50/50.
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Old 02-08-13, 12:04 AM
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Originally Posted by neneboricua View Post
I'd be interested in reading his thoughts on it. Couldn't find his comments online. Do you have a link handy?
he posts on the training and racing with a powermeter facebook page.
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Old 02-21-13, 09:14 PM
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Haven't heard much since these started shipping. Did anyone purchase one and try it yet?
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Old 02-21-13, 11:51 PM
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Originally Posted by Gjc985 View Post
Haven't heard much since these started shipping. Did anyone purchase one and try it yet?
I know that lots of reviews are in the pipeline, and that Stages has released another firmware update since the Rainmaker review was written. I don't know for sure but I hope that part of the reason the reviews have been slow to come out is because the bar was set pretty high and reviewers have been looking carefully at the oddities identified in Ray's piece.
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Old 02-22-13, 07:39 AM
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ya very strange. I wonder how sales are after the initial round of reviews
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Old 02-22-13, 11:20 AM
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No Campy no play for me
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Old 02-22-13, 12:42 PM
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^ you can use DA cranks with a Campy drivetrain.
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Old 02-22-13, 03:55 PM
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Still have not ruled out this option. Even with the "pulse" in power, still may meet my needs,
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Old 03-19-13, 05:28 PM
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I just got mine this weekend. I installed it Sunday and for my purposes and the price...I think it was a worthwhile investment in my training.

Here it is installed:


My first ride with it properly calibrated (My fault with the screw up on calibrating initially):
https://connect.garmin.com/activity/286403000

Note: I am a female, athena, non-racer that is going to use this to help me train for events (centuries, metrics)
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Old 03-19-13, 06:43 PM
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dang you got abig sprint......
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Old 03-19-13, 06:45 PM
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Originally Posted by jsutkeepspining View Post
dang you got abig sprint......
No kidding. Going by her numbers she is one very strong woman. I weigh 215ish and I haven't had a sprint that high yet this year and she ties my highest wattage last year.

Looking at her average wattage, average speed, and amount of climbing I would have to say that the average wattage is way off as well unless she was carrying a parachute behind her.

In my (useless) opinion if she is a female non-racer then it really makes me doubt the accuracy of the Stage and pushes me even further away from purchasing one.
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Old 03-19-13, 06:58 PM
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Thanks for sharing, Beachgrad. Darned good to do a .96 IF ride for one hour with that stable a power output and have your heart rate drop for the second half of the ride. Might be time to reassess the FTP

The spikes do look pretty suspect -- huge spikes like those with (often associated with a quick change of cadence) were one of the problems in DC Rainmaker's test if memory serves.
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Old 03-19-13, 07:16 PM
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Originally Posted by svtmike View Post
Thanks for sharing, Beachgrad. Darned good to do a .96 IF ride for one hour with that stable a power output and have your heart rate drop for the second half of the ride. Might be time to reassess the FTP

The spikes do look pretty suspect -- huge spikes like those with (often associated with a quick change of cadence) were one of the problems in DC Rainmaker's test if memory serves.
The garmin graphs are misleading. Her HR and power both dropped for the 2nd half of the ride and look normal.

The erroneous power and cadence spikes would be annoying. It appears they haven't fixed the issue with cadence measurements yet. Presumably they'll be able to fix that with updated firmware.
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