All you need to know is they'll give you different numbers and though both companies will claim to high heaven they are correct there is no way to know who is and really neither is since neither are actually measuring force.

In other words, garbage in garbage out.

That's what I thought. With no strain gauges, it's just an algorithm guessing your power.

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One of them is accurate as far as pace goes. I don't know how I could trust a pod/system to tell me power when it can't even do pace reliably.

That said, while I use the power field on the watch, I only pay attention to the pace. I would keep an eye on power if I was running a hilly race though.

Does the Wahoo Tickr X work as well as a footpod for Zwift running?

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The TickerX will work with Zwift Run, yep. https://www.youtube.com/watch?v=gTkqWY38idg

If you want something that works 'well', then go for a Stryd / Stryd Live.

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Shane Miller - GPLama
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Hi Shane! I've been watching a lot of your videos. Great stuff! Is the Garmin footpod worth it? Or is the Stryd the best out there? I called Wahoo and they told me the Tickr X would work but I wonder if it's as accurate as a footpod? I told Wahoo I watched your video haha

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BryanD wrote:

Hi Shane! I've been watching a lot of your videos. Great stuff! Is the Garmin footpod worth it? Or is the Stryd the best out there? I called Wahoo and they told me the Tickr X would work but I wonder if it's as accurate as a footpod? I told Wahoo I watched your video haha

I haven't used the Garmin pod (even though I have a FR935). ANT+ only... argh. Jump over to the Zwift Running Facebook group. There's a ton of info there and posts about pods / accuracy / reliability / etc. The Stryd always bubbles to the top.

https://www.facebook.com/groups/zwiftrunners/

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Shane Miller - GPLama
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Bryan,

I have been running with a Stryd pod for well over a year now. I know that the power numbers are based on an algorithm, but they seem to be consistent, judging it on a route I run regularly. You do have to use a little pixie dust faith to buy into the numbers, but it has definitely been beneficial when running hilly courses where pace is harder to use as a judge of effort.

On Zwift, Stryd is great. Just calibrate it with your treadmill and roll, especially if you know the true speed of your treadmill. Zwift does not show run power, but I keep it on the watch to hit that target, as the indoor and outdoor run paces vs power can sometimes be a little off depending on the incline of the treadmill.

Ian

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I was going to buy a Garmin footpod as I have a Fenix.

Then I read this and kept my wallet closed...

https://www.outsideonline.com/2276656/what-running-power-anyway

FWIW, I bought the Milestone Pod last fall specifically to use on Zwift. IMostly I chose this one because it was cheaper than most of the other ones out there.

t's been great. You can calibrate the foot pod speed to match your treadmill speed.

I've never seen an option to display power for this pod though.

Very interesting article

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Hi All,

Thanks for your posts.

I recommend reading our Training Manual if you are interested in learning more about running power: https://www.stryd.com/guide

Stryd measures power. Power is acceleration x velocity x mass. Stryd receives mass from the users and can accurately measure acceleration and velocity.

If you are interested in data accuracy, please reference our white paper validation: https://blog.stryd.com/...meters-quality-data/

Best,
Angus & the Stryd Team

At the risk of stating the obvious you are fundamentally wrong. If you want proof put on the go ride a bike with a power meter while wearing a stryd (correcting the mass input to include the bike). If Stryd was actually measuring power it would give you same value.

Power is the rate of work or the change in mass x acceleration x distance divided by the change in time. (see https://en.wikipedia.org/wiki/Power_(physics) ). Velocity is a vector, meaning is isn't the same as distance/time, so by using velocity Stryd reports a number which definitively isn't power. Its also this dumbing down from 3-D distance to 1-D velocity which is why you can't calibrate a running power meter in the real world. Simply put the relationship between 3-D distance/time and 1-D velocity can not be mathematically related in a way which allows a consistent conversion of one to the other.

Scott,

Thanks for your comment. It seems like you have great interest in this field and want to learn more. I encourage you to email us at stryd@stryd.com.

Stryd is built on motion tracking technology. It accurately understands movement in all three dimensions.

Stryd is purely built for running so you should not expect to use Stryd to gather power on the bike. There are many differences between the activities: impact, gearing, etc. You can only use a cycling power meter for cycling. You can only use a running power meter for running. They are purpose-built tools.

Best,
Angus

Are you directly measuring force or calculating it based on some propriety method based on how the shoe is moving?

If it's the latter, it's BS.

Stryd and Garmin do not measure force. It's an algorithm that calculates it. Garmin and Stryd differ on how they do this.

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As I noted above the issue isn’t that they aren’t measuring direct force. It’s that they aren’t reporting what they measure.

Stryd knows the mass of the pod and they can accurately measure acceleration accurately so they 100% can measure the direct force exerted on the pod. The problem is that they don’t use that force in what they report. Instead they use some complex equation that gives another value.

So they have a power meter they just choose to not report power. The question is why? Either the power number is meaningless or their acceleration measurents are too noisy to use.

Force applied to the sensors in the pod (deceleration/acceleration) are not the same as those applied to the ground. Your shoe and feet flex through the force applied by your body. This is not measured by a pod attached to your laces. So even if they reported the force measured in the foot pod, it would need to run through an algorithm to spit out power. Just as cycling power meters do.

I'm neither defending nor supporting their readings. Just that you need to remember that the "power" number you want, isn't the same as what Stryd and others deem useful.

I think you misunderstood my point. There is no need for an algorithm to calculate power at the pod. It’s a direct formula of what you measure.

I agree it’s not the same as power exerted at the ground for all the reasons you listed. But that’s ok because you would be measuring something that’s easily validated and useful. Pod power vs speed would be very equivalent to bike power vs speed. Yes stiffness/power transfer, aerodynamics, weight, etc all come into play.

The problem with Stryd as it stands is it isnt independent of speed.

Hi All,


Marklemcd,

Stryd reports power with high accuracy. You can read more about validation here: https://blog.stryd.com/2017/12/06/how-to-lead-the-pack-running-power-meters-quality-data/




Scott,

Stryd does report power. Can you explain more on what you mean here?

Best,
Angus

I think he is saying that you are using an algorithm to report power instead of measuring the direct force of landing and pushing off the ground.

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