>>/51712/
since I read about that a number of times on cyc I swap the gravel bike rear cable at the 3k km mark no matter its state to be safe, you can buy a set of good cables (coated or polished - I prefer polished) for 2€ from CHINA, I recommend those. I bought 20 so I'm probably set forever, previous cable didn't have any visible wear on it but I'm sticking with the plan.

But to be honest I have one mate who rides 11 speed mechanical and his cables only last about 7000 km he said, he used the shimano opti-something cables before I hooked him up with the goods from CHINA