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Re: [OM] IMGs: A Very Unusual Bicycle

Subject: Re: [OM] IMGs: A Very Unusual Bicycle
From: Chris Trask <christrask@xxxxxxxxxxxxx>
Date: Tue, 2 Aug 2016 06:54:55 -0700 (GMT-07:00)
     Yep, and they're pretty expensive if you can find one.  There have been 
other automatic shifters, mostly centrifugal internal hub types and at least 
one electric one. 

>
>Sounds like a bicycle automatic transmission if I'm understand your
>description.
>
>Charlie
>
>On Tue, Aug 2, 2016 at 9:21 AM, 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:
>

Chris

When the going gets weird, the weird turn pro 
     - Hunter S. Thompson
-- 
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