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Message: [QUOTE="Jaybird, post: 1233637, member: 22283"] The mfg's will recommend a change-out at about 1.5% over new pitch for a non-ring chain, and about 1% for a ringed chain. They state differing time tables even though the ring and non-ring chain are essentially the same thing. The reason is that a ring chain will start to wear once the pre-injected lubricant has seen it's usefulness decline, and once it starts, it will grow very, very fast. Much faster than a non-ringed chain that can still be lubed. If you are running a steel rear sprocket, you can probably get by with a chain until it sees about 2% growth. #520= .625" pitch length 10 links = 6.25" center-to-center of the pins new (chain must be taught) 6.25" x 1.5% = 6.34" 6.25" x 2% = 6.38" [/QUOTE]