Fred Rafael Rednor wrote:
>My real fear is that the "Hypergloid" setup - which actually
>causes 2 sprockets to be engaged simultaneously - would produce
>too much strain for the rivets of the old style chains.
It's not clear that such engagement would occur with old-style chains
that have protruding rivets. My guess is that the protruding rivets
would defeat the much of the functionality of the ramps.
>
>Is that why you suggest avoiding shifting under full load when
>using these freewheels with an older style chain?
Yes, you should always avoid shifting under full load with old style chain. With old style freewheels it was not possible to shift under full load, so this wasn't an issue.
That's why when Hyperglide first came in there was a rash of chain
breakages. These failures were incorrectly attributed to some
imagined deficiency of the chains, but it was actually the fact that
Hyperglide made possible full load shifting that led to the failures.
>The reason I'm trying to get this sorted out in advance, is
>that - beyond the NR setup - I'm considering the use one of
>these pieces with a Huret DuoPar; In my experience, those
>_really_ prefer stiff chains for best operation - even moreso
>than the Campagnolo NR.
I doubt that this is true if you use a modern ramped cluster.
Sheldon "No Fan Of Old Derailers" Brown
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