New chain skips when old chain was replaced at 0.75% mark I have a 3x8 hybrid bike that I use for commuting. I clean and lube the chain about every 200km, and regularly check it for wear using a chain cheker. I usually manage to ride between 1300 to 1600 km before the chain wears out beyond to the 0.75% level, at which point, to my understanding, an 8-speed chain requires replacement.
The problem is that every time I've tried replacing a chain that was worn at the 0.75% level, the new chain skips on all hub sprockets, even though these never look particularly worn out, and even at low load. As an example, see the attached photo with the latest worn hub.

Every time, this forced me to keep riding with the old chain until it broke, usually between 3000 and 4000 km, and then replace the entire drivetrain.
I tried changing the chain earlier, and so far I've got it down to 1200 km, but the issue remains.
Contributing to chain wear are the following: I am over 190 cm tall and weigh over 100 kg; I live in northern Europe, where the climate is rainy from autumn to spring and the grit on the road is granite or other hard stones; I often carry my son in a trailer, adding 40+ kg of pulled weight.

In your experience, is it normal that an 8-chain skips at every turn at the 0.75% wear level?
If so, given the information above, when would you suggest me to change the chain to avoid wearing the hub down?
To me, that looks pretty worn.  My guess is that as the chain elongates, it grinds further into the gear valleys, making the &quot;flattened&quot; profile.  The chain and cassette become mechanically paired, wearing together until the chain breaks.  The cassette longs for its lost chain and will not take another mate... er, is mechanically incompatible with other chains.   The wider profile probably leads to periodic instances of 2 rollers in the same gear valley, sort of riding the top of the valley and unable to lower a single roller.
So, options...  1)  Clean frequently, and maybe consider a different lube.  Lube minimally, just on the rollers.  I use Muc-Off dry ceramic for our gritty trails, but it's very dry here.  I have no idea how it'll handle your wet grit.  2)  Replace the chain sooner.
For comparison: