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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: What's old is new again...Pinion's great grandpa
Date: Fri, 18 Apr 2025 08:18:22 -0500
Organization: Yellow Jersey, Ltd.
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On 4/17/2025 10:28 PM, pH wrote:
> I happened to stumble upon this "restoring a bike" video.
> 
> Not much talking in it, but it seems to be a *two speed bottom bracket*
> bike. I had never heard of such a thing...on this group or anywhere.
> 
> https://www.youtube.com/watch?v=SUi0PMG503g
> 
> The gearbox does not really make an appearaance until the "assembly" phase
> of the video.
> 
> My mind immediately jumps to: How about pairing it with a two-speed rear hub
> for a total of four speeds or a three speed and on and on.
> 
> I am very curious if anyone is familiar with this beast asto what the
> ratios would be...direct drive, no doubt, and....?
> 
> pH in Aptos
> 
> 

It can be done, and has, but Archibald Sharp spent some 
several paragraphs on why gearing is better applied at the 
driven end than the drive. In 1899.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971