georgew wrote:niggle wrote:I don't trust the fancy chain wear indicator tools as they are affected by the degree of free play of the rollers, and can therefore over read for wear. The steel ruler method is completely reliable IME, change the chain when it has 1/16" stretch over 12" and the sprockets should be OK.
The tool is to be used while the chain is under tension. I think that this meets your objection.
No, not really: the rollers have movement ('float'?) in relation to the bushing/pins of the chain which will not be affected by the chain being held taught, but will affect the measurement given by a tool like the Park one as it bears against the side of the rollers.