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Measuring Wear
The important issue of chain wear is that the spacing changes, causing the chain to ride up on the sprocket teeth. Thus, it is important to measure pin/bushing wear. However, bushing/roller wear does not affect chain performance unless it becomes so severe that it affects structural integrity — the bearing is worn away, the roller fractures, or the like. Thus, bushing/roller wear should not be included in overall wear measurements.
The standard procedure for measuring chain wear is to hold a ruler against the chain. With 1/2-inch spacing chain, 24 links should measure 12 inches new; if 24 links measures 12-1/8 inches, the chain has worn about 1%.
The following shows a worn Regina CX-S and an unused Sachs chain. The Regina chain has the pin is aligned with the ruler at 23 inches. One foot away, an unworn chain would have the pin aligned to the 11 inch mark. However, this chain is worn so the pin is about 3/32" away. (It looks less, due to camera parallax distortion. Consider the links at 10" and 9", which are much further from the inch marks.)
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