Originally Posted by
Bob Dopolina
So if the pin only wears while it travels around the cassette and through the pulleys, and the wear is in a narrow section of the pin, and when a link is traveling either to the rr der or away from the rr der, there is low stress and therefore low wear, then the only time the wear in the pin becomes a factor is when it passes over the cassette and through the pulleys?
So you are saying that the effective length of each link changes at this critical point and that once clear of the cassette and pulleys, it returns to normal length because the worn part of the pin is no longer bearing the load? A different section of the pin is?
If this is true, I should be able to measure a difference between the center of the pins when a link is bent under load and when it is straight and under less load?
This sounds like a job for DIGITAL MIC!
That's exactly right. The differences in one link are small, which is why you measure wear over a long length
of chain. By inverting the chain, you change the process from a link moving from a slightly worn spot to a more worn spot, to a link moving from a slightly worn spot to a less worn spot.
The changes are small, but small changes are what causes excess cog wear.
em