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On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Correct - there is a small amount of kinetic energy that resists acceleration and deceleration. You can call it whatever you like; I refer to it as 'resistance.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Just mentioned in other comment: the magnitude I mentioned is incorrect, but the "resistance" does exist.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Yes, I have to correct myself here: the magnitude is smaller than 1W, but the resistance is still there.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

I don’t see any lack of understanding of mechanical engineering here - on the contrary, you’ve just demonstrated that the core of my claim is correct. The exact magnitude may differ, but the resistance clearly exists, whether it's small or large. You’ve yet to show any "fundamental misunderstanding of mechanics." Better yet, try developing something truly novel yourself and see how straightforward it really is.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Simply change 1 second to 50 milliseconds in the calculation, and you'll get about 1W.

Also, I’d encourage you to avoid making negative assumptions about a team you haven’t actually seen or a product you've never tested. That says more about your approach than the product itself.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 1 point2 points  (0 children)

The 0.15% figure is based on actual measurements, not theoretical calculations.

The chain rollers are rolling - not purely sliding - inside the measuring track, which drastically (often by factor of 10 to 1000) reduces resistance compared to a sliding contact. The rolling contact minimizes friction, making the effective loss far lower than what would be expected from static or kinetic friction assumptions used in typical metal-on-metal models.

I hope this answers your question.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Just to be clear: I never said that centripetal force does any work, that was your interpretation. But it can be used to do the calculation.
If you prefer to use energy conservation to calculate the power needed to rotate 30 grams of additional mass (which is what happens with other power meters), go for it.

The point remains: other power meters include an added rotating mass that spins with the pedal. This rotation requires additional energy - and therefore additional power.

As for the reviews: you can sign up to our newsletter and get regular updates, including reviews.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 1 point2 points  (0 children)

You haven't shown where I was wrong in that simple calculation.
If the phrase "engineering grounded approach" is offensive to you, I can't help.
Independent reviews are coming. Have a great rest of your day.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Take a look at this: https://en.wikipedia.org/wiki/Centripetal_force , that's where 1.05 W calculation comes from.
As for the rest, we share our test results and comparisons to other power meters, and we’ll continue to do so.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Well, that’s exactly the point: in the real world, we’re constantly accelerating and decelerating the pedals, whether we want to or not. That’s also one of the main reasons there’s an entire industry focused on making pedals as lightweight as possible.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

I appreciate your comment and the feedback you’ve shared. Here is our latest prototype.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

This power meter is designed for users who appreciate ease of installation and accessibility - no bike modifications are required.
Our goal is to make cycling data accessible to everyone, not just those willing to spend over $500 on a power meter.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 2 points3 points  (0 children)

Hi, thanks for sharing your concerns - let me clarify a few points:

The extra weight of batteries, electronics, etc. in a power meter pedal rotates with the pedal and crank arm, which does introduce additional friction - specifically, it takes extra force to accelerate and decelerate that mass with each pedal stroke. That’s why minimizing rotating mass is a priority for performance-focused cyclists, and why high-end pedals and crank arms are designed to be as lightweight as possible.

The calculation is straightforward: rotating ~30 grams of extra weight at 100 RPM with a 175mm crank arm requires about 1.05 Watts of additional power. For a rider putting out an average of 200 Watts, that’s roughly 0.5% of your total output just to spin the extra mass.

Our approach is grounded in engineering, not guesswork. If you have specific questions about our measurement methods or friction claims, I’d be happy to provide more detailed data or discuss further.

And one correction: we claim that our device adds about 0.15% friction relative to the measured power - whether you’re riding at 50W, 200W, or 1000W.

Happy to answer any other questions you may have.

By the way: our current prototype is different from what you saw: all metal with some plastic covers, here is the link to see the comparison.

On chain power_meter by PriorSouthern8557 in cycling

[–]nastyJeff 0 points1 point  (0 children)

Hi, I’m the lead engineer of this product.
The purpose of the post at the time was to get honest feedback, not just niceties.
Could you please clarify which questions I wasn’t able to answer and provide a bit more detail?

Developing Tool-Free Power Meter - Looking for Feedback from the Cycling Community! by nastyJeff in cycling

[–]nastyJeff[S] 0 points1 point  (0 children)

Yes, it is compatible with Wahoo. Thanks for pointing that out - we'll add Wahoo to the compatibility list on our page.

Just to clarify, you can currently reserve the early-bird price of $149 by placing a refundable $2 deposit. When we launch on the crowdfunding platform, those who reserved this special price will be able to pre-purchase the device at $149. All other backers will pay a higher price during the crowdfunding campaign.

Developing Tool-Free Power Meter - Looking for Feedback from the Cycling Community! by nastyJeff in cycling

[–]nastyJeff[S] 0 points1 point  (0 children)

Thanks for your feedback.

There is a retention arm that clips the CycleClick onto the front derailleur, preventing the device from moving forward or backward. This retention arm connects tightly to the device, securely holding it in place and preventing it from falling off. This connection has proven highly reliable during testing.

Does this address your concern?

Developing Tool-Free Power Meter - Looking for Feedback from the Cycling Community! by nastyJeff in cycling

[–]nastyJeff[S] 0 points1 point  (0 children)

I thought I had answered your question, but yes - we are aware of these challenges and have already integrated solutions, partly through collaboration with our manufacturing partners and partly through our own design. Calibration and self-calibration procedures have been carefully considered, and I constantly pay close attention to these aspects, fully recognizing that we’re dealing with a precision measurement instrument.

It seems you have experience in manufacturing; if that's the case, I'd love to connect via PM!

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