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Old 02-28-2011, 11:28 AM   #20
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 7,997
That is a very good photo of a very worn sprocket. To a somewhat lesser extent usually, I see worn crank sprockets like that almost every time I replace a chain. I have never seen a worn simplex cam sprocket myself although I did see a picture of one on the net. I see them on duplex setups about half the time. The duplex setups just don't wear as well for some reason.
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