I'm sure this is a stupid question but humor me if you would: What happens if one tries to shift across a 4 speed block or God forbid 3 speed with a 5 speed derailleur of this sort? And why not simply limit the motion's travel (obviously no mean feat to accomplish) to suit whatever is required on the day rather than making multiple incompatible pieces?
Kurt Sperry Bellingham, Washington USA
On Fri, Mar 19, 2010 at 11:23 AM, Neil Foddering
<neilfoddering@hotmail.com> wrote:
> Because the range of travel across the sprockets on the block on this type
> of derailleur is dictated by the length of the spindle along which the
> derailleur jockey cage slides, and therefore, a different length of spindle
> is required for 3, 4 and 5 speeds. On a parallelogram derailleur, this
> range is adjustable (within certain limits) across varying sizes of block.
>
> Neil Foddering
> Weymouth, Dorset, England
>
> ________________________________
>
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>
>> From: haxixe@gmail.com
>> Date: Fri, 19 Mar 2010 10:48:21 -0700
>> CC: classicrendezvous@bikelist.org
>> Subject: Re: [CR] another Osgear/Super Champion question.
>>
>> This does however raise a question that I've had for a long time which
>> is, why in the '50s did major derailleur producers such as Simplex,
>> Huret and Cyclo produce distinct derailleur models for 3, 4 and 5 cog
>> freewheels? It obviously was wholly unnecessary to do so, and I'm
>> struggling to think of any upside.
>>
>> Kurt Sperry
>> Bellingham, Washington
>> USA
>>
>> On Fri, Mar 19, 2010 at 10:25 AM, Neil Foddering
>> <neilfoddering@hotmail.com> wrote:
>> >
>> > I've set up both three and four speed Osgears, and the fork for each
>> > type was the same. As Jan says, the only difference I could see was the
>> > number of holes in the lever.
>> >
>> > Neil Foddering
>> > Weymouth, Dorset, England
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >> Date: Fri, 19 Mar 2010 10:01:15 -0700
>> >> To: classicrendezvous@bikelist.org
>> >> From: heine94@earthlink.net
>> >> Subject: [CR] another Osgear/Super Champion question.
>> >>
>> >> >How can one tell if a Super Champion rear derailleur is for a 3
>> >> >speed or 4 speed freewheel? Thanks for your help if you know the
>> >> >answer. :-)
>> >>
>> >> The easiest way to tell is by looking at the indexing shift lever.
>> >> The 3-speed version has 3 holes, the 4-speed version has 4 holes.
>> >>
>> >> From what I can tell, the actual shifter fork on the chainstays was
>> >> the same for both versions. I compared the photos of the Oscar Egg in
>> >> "The Competition Bicycle" with photos of a 4-speed. While it might
>> >> make sense to have a longer shifter fork for more rear cogs, the two
>> >> shifter forks look the same.
>> >>
>> >> Jan Heine
>> >> Editor
>> >> Bicycle Quarterly
>> >> 2116 Western Ave.
>> >> Seattle WA 98121
>> >> http://www.vintagebicyclepress.com
>> >> _______________________________________________
>> >
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