We broke our new SRAM 1090R (drive chain), on a steep descent that suddenly became a steep climb, during the Mt Tam double century. This thing was literally a "V." The chain was only on maybe mile 200 of it's life. It was my fault, due to a poor shift.

This ride was awful for tandems, in the fact that it was endless so-called "Italian rollers." I have never shifted so many times in my life!! It was around mile 160 or so and we were pretty fatigued at this point. I got lazy and/or just from being tired I shifted too late, executed a nasty front shift, and then put the power down before the chain was fully seated on the next gear... SNAP!

Thankfully, I carry an extra powerLink. I used my chain tool (on my nice little muti-tool), popped off the snapped links and installed the powerLink in it's place We are still riding it now, I don't see why not.

PS- It was a standard link that snapped (not a powerLink).