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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: RE: Only 14 gear ratios? Primitive!
Date: Wed, 4 Dec 2024 14:44:12 -0500
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On 12/4/2024 12:47 PM, cyclintom wrote:
> On Wed Dec 4 00:05:00 2024 Frank Krygowski  wrote:
>> Bike transmissions: Derailleurs are easy to understand. Internal gear
>> hubs are more complicated. (When I was teaching, I had our machinist do
>> a cutaway of a Sturmey-Archer AW hub and mount it on a display stand
>> near an explanatory poster, so interested students could see what made
>> it work.)
>>
>> Rohloff 14 speed gear hubs are an order of magnitude more complicated
>> than AWs. But this new gizmo makes a Rohloff look like child's play.
>> It's a true continuously variable transmission, with an infinite number
>> of gear ratios, that is completely gear-based. No slipping surfaces, and
>> supposedly minimal friction losses.
>>
>> Here's the link to the half hour explanation video:
>> https://www.youtube.com/watch?v=mWJHI7UHuys
>> You may want to start at about 14:30 before returning to the beginning
>> to digest the super-complicated explanation of it's operation.
>>
>> No info in the video about prototype weight, efficiency, etc.
>>
> 
> So this is something you consider "super complicated" is it? All anyoine should have needed is to see the levers slidding in the slots to grasped the method that was used to both make the tranmission continuously variable and limit the upper and lower ratios. But I suppose you needed a half hour showing gears to grasp the idea.

Yes, Tom, I do consider that mechanism to be super complicated.

Of course, all of us here are familiar with your status as a mechanical 
genius. ... um, one whose cranks fall off his bike, whose handlebars 
slip, whose seatpost slips, whose derailleurs frequently don't work, who 
needs special "non-stretch" cables ...

-- 
- Frank Krygowski