Park Tool Chain Wear Indicator

It works well and appears to be a high quality measuring tool

It would seem the wear limit for most narrow chains is 0.5%. As this is a go/no go indicator, you need to use regularly or buy a more expensive continuous reading gauge. I let the chain on my winter hybrid wear beyond 1%. Fitted a new chain & cassette but it skipped on my chainrings so ended up repl… Read more

I chose this product even though it's pricier than other chain gauges because it measures 0.5, which is uncommon in chain gauges. In my opinion, the 0.5 measurement is crucial to predict chain wear, as at 0.75 it's already necessary to replace it. At 1.0, it's already too late…

It does what it needs to do