Originally Posted by
BobbyG
Chain beaker. I put a 53-tooth chainring on my 90's MTB to get the top speed up. The ring just clears the chain stay but doesn't leave room for the chain if it falls off, so the chain will get caught and sometimes a link will get pinched or mangled beyond repair. I now also carry a masterlink pliers for the same reason.
I've also had spokes break causing wheels to go out of true enough to rub the frame.
Because my new commute is only 6 miles (vs the old 9-miles) and I'm now in my 60s, when I ride my rackless road bikes I've started to use a smaller, lighter backpack without all the extra tools. When I ride the bikes with rear racks I usually bring the whole kit and caboodle.
Great answers. Modern chains are more prone to breaking than the old ones are, because we want (or are believed to want) so many more speeds. I once took a long ride as a stoker on a tandem. The drivetrain had a 10-speed cassette. I was stronger than the captain's usual partner who is a woman smaller than I am. When the captain and I took off from a standstill, we torqued it pretty hard and broke the chain. I may not break a chain on a single bike, but I'm ready. I have a quick link and a mini chain breaker in my tool bag, and my tool bag goes onto the saddle of whichever bike I ride.
The way your chain broke is a failure mode I hadn't heard of. I imagine it's specific to the geometry of your bike.