I was wondering about the 530 o ring chain I just bought, its a bikemaster chain from jcwhitney. My old front sprocket on the bike looks as good the new one it has no wear, I installed the new just because and saved the old one for backup, the rear is another story you can clearly see its not half moon shaped between the tips and the tips are getting close to being sharp points. I am still waiting for jcwhitney to ship my new rear sprocket, my setup is as stock 18 front 48 rear and 530-100 o ring chain, I am curious about the masterlink too because I don't have the extra cash to buy a riveter and have heard about the ball peen hammer trick, but at the same time I bought a master link clip and was gonna install it until I looked at it all and became unsure as to whether or not I should use the master link clip(it doesn't have o rings) or just go ahead and carefully do the rived dude. What do ya'll think.
Venturous belwo is a pic of my old sprocket, its not dangerously at its end but its getting there, you can see there is a little bevel left to the tip and its not quite a sharp point yet. when it gets to the sharp point at the tips its past its life span, that is the most notible thing. You also want to check the shape inbetween the tips as they should be round like what 78550k stated.