happens to be my most common mechanical, and that's maybe once per year. Requires something to assist getting the jammed chain free, but I can usually use rearward spooling of the chain by the cassette to "help" break it loose.


Other mechanicals are extremely rare. Derailleur cable tweak. Seatpost clamp tightening. Saddle clamp tightening. Once, I rewrapped a handlebar side because it gapped during a ride and annoyed me. I have broken spokes on a particular wheel, which I have since replaced (it was years ago).