this post was submitted on 14 Jul 2024
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Personally I wouldn't think wax would add enough of a layer to change a chain checker's reading. The wax layer is pretty thin.
But a chain's wear is measured in fractions of a percent, so a very small layer could significantly throw off the reading.
An 11 speed chain should be replaced at 0.5%, for example.
The chain checker also spans ten links, but only touches one link. The very small layer will not throw off the reading.
I was under the impression that all pins in the series add up to the measured wear, like in this image:
That's exactly correct. The point that the wax could interfere with the measurement is only where the chain checker touches the chain. Waxed chains wear much slower than usual, though, so I wouldn't be too worried about it.