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Old 08-03-25 | 07:56 AM
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tomtomtom123
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Ratio zero variable transmission hub

What do you think is the probability of the ratio zero variable transmission hub becoming available for bicycles in the near future?

There is a YouTube video from 8 months ago showing the internals of the working prototype designed for bicycles, with a claim that a better more compact version is being worked on. But I haven't seen any further updates on it.

It goes from 0-600% gear ratio, but all gears are rotating so there really is no real 1:1 with minimal friction, at least from my probably incorrect understanding of how it works. So I'm wondering how much efficiency is lost due to friction and how much that increases as a higher ratio is selected.

Would it be less or more efficient than the dual drive, SA, schlumpf/ATS , efneo, rohloff?

The video also mentions the output power isn't consistent, it oscillates, but there's an elliptical gear meant to stabilize the output, but the chart shown comparing the output before and after the elliptical still indicates some oscillation after.

Last edited by tomtomtom123; 08-03-25 at 09:17 AM.
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