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[OM] IMGs: A Very Unusual Bicycle

Subject: [OM] IMGs: A Very Unusual Bicycle
From: Chris Trask <christrask@xxxxxxxxxxxxx>
Date: Tue, 2 Aug 2016 06:21:38 -0700 (GMT-07:00)
     Every so often we have a bicycle show up in our shop that stands out for 
one reason or another.  On Sunday a fellow showed up with an almost pristine 
64cm 1980 Motobecane Grand Jubile, the only blemish being the rear wheel, which 
was not original.  He had picked it up for $160 in a non-profit shop in Tucson. 
 I was deep green with envy.

     But yesterday a bike arrived that towered above anything else I have seen 
in terms of uniqueness: A CSA Autobike.  This ingenious contraption has an 
automatic rear wheel shifter that operates by way of three weights that slide 
along the spokes, which operate a trio of clevises, which operate a trio of 
pistons, and which then push a shifting ring outwards against the chain as the 
wheel goes faster, shifting the chain to a smaller sprocket.  A conventional 
rear derailleur provides chain tensioning and jockying for down-shifting.  The 
crankset is also a freewheel so that the chain can move while coasting so as to 
allow the wheel mechanism to shift down as speed decreases.  Here are some 
photos:

https://www.flickr.com/photos/64004640@N03/28642433541/in/dateposted-public/

https://www.flickr.com/photos/64004640@N03/28720219755/in/dateposted-public/

https://www.flickr.com/photos/64004640@N03/28720219715/in/dateposted-public/


Chris the Moto(bécane)maniac
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