Join Date: Jun 2010
Location: NW,Oregon Coast
Mentioned: 23 Post(s)
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In current derailleur chain, the punching the hole in the inner side plate
provides the metal that supports the roller, its pushed in.
hot forged, I expect,
that edge contact is where the wear is concentrated, contacting just the ends of the roller.
and the inside has the pin passing thru it, held in place in the outer side plate..
if the side plates are thinner that bushing ring is thinner too..
older full bushing chain uses a separate sleeve in the inner link
it supports the roller an in turn is supported by the pin, full width.
not as laterally flexible, but was the [Regina Oro etc] 3/32 6 speed
derailleur chain in the 60's, and track chain in current use. 1/8"
Last edited by fietsbob; 09-04-11 at 10:32 AM.