[email hidden] (Jeff Wills) wrote in :"]news:[email hidden]:
Quoted message said:rorschandt <[email hidden]> wrote in message
news:<[email hidden]>... <snip>Quoted message said:Nine speed chains and pins are narrower than ever, and a slight error in placement results in a
greater angle of deflection. Shimano hoopla if you ask me. But that's just my opinion, I could
be wrong.rorschandt
IMHO, the special pins are necessary because the original pins are peened over the sideplates on
assembly. When these pins are pushed out, the sideplate's holes are enlarged slightly. The
replacement pins are larger in diameter by that same amount. Pushing the original pin back in
means the hole is now too large for the pin, leaving the area open to failure.Jeff
This sounded legit, and intrigued me, so I made the following measurements(diameter) with my digital
calipers: Original pin =.143" , peened area at its largest =.153" replacement pin =.141", has ridged
area where the plates would reside,the two ridges measure =.145", the "valley" between is =.141"
Hole that has had a pin pushed out =.141"
Although the hole in the chain plate may not be enlarged, the way the replacement pins are formed at
the ends would certainly hold better.
rorschandt