Interesting how different posters have different failure modes.
I've worn out everything multiple times over. The only thing I haven't broken though is a chain. I've got a wall full of stretched chains, but the only time I have broken chains is when I have tried to reinstall links, and the pins popped loose (so it was my fault). I use the quick links mentioned above to avoid this.

Also- I think the wear thing has increased as the sprockets and chains get narrower and narrower. I'm "old school" with 10 rear road cassettes and 9 rear mtb cassettes.

Here's a pic of one of my front chainrings. Check out the teeth behind the shift pins in the chainring.

Just pulling this chainring out of my parts bin reminded me of miles of smiles!

http://forums.pelicanparts.com/uploa...1467761695.jpg

The only time I've broken a chain was at the removable link. I always keep a spare set in my seat pack.

HA!:D

I went out and looked through my bin (actually several dresser drawers of old worn out s#$%,) It got me thinking, I have tried all sorts of methods to keep things from wearing out. If anyone finds the answer, let me know!

That's crazy. I'd worry that will slip as soon as I get out of the saddle!

My MTB chains are continuous with the rivet tool - I am paranoid about the quick locks.

That's exactly what it began doing!:D

Different bikes with different functions and needs. In 18,000 miles, I've had exactly one Missing-Link failure.

That's one failure too many - it could literally get you killed ... I trust it enough for the commuter .... Rarely get out of the saddle on it!

I'm more observant of the cogs and chainrings, less of the chain. If the chainrings are worn, likely the chain is. I never use quick or master links. Tri-flow is my goto chain lube. Sparingly and then wiped.

BTW: I have 60+ y.o. chains still in good use.