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Re: [OM] IMGs: A Very Unusual Bicycle

Subject: Re: [OM] IMGs: A Very Unusual Bicycle
From: Nathan Wajsman <photo@xxxxxxxxxxxxxx>
Date: Tue, 2 Aug 2016 21:52:37 +0200
My initial thought: a solution in search of a problem…

Cheers,
Nathan

Nathan Wajsman
Alicante, Spain
http://www.frozenlight.eu <http://www.frozenlight.eu/>
http:// <http://www.greatpix.eu/>www.greatpix.eu
PICTURE OF THE WEEK: http://www.fotocycle.dk/paws 
<http://www.fotocycle.dk/paws>Blog: http://nathansmusings.wordpress.com/ 
<http://nathansmusings.wordpress.com/>
Cycling: http://www.crazyguyonabike.com/belgiangator 
<http://www.crazyguyonabike.com/belgiangator>
YNWA













> On 02 Aug 2016, at 15:21, Chris Trask <christrask@xxxxxxxxxxxxx> wrote:
> 
>     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
>   ~~~           __o
>    ~~~       _ <_
>   ~~        (_)/(_) 
> -- 
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