Originally Posted by sweeks

Roller wear *contributes* to chain elongation measurement, which is why the "2-point" checkers have reduced accuracy. But elongation is the result of wear on the pins and their complementary bearing surfaces on the inner links. It seems to me that the rollers could all be worn or unworn and the chain would not contribute to excessive sprocket wear as long as the pin-to-pin spacing was 1/2 inch.