My Hilsen was shifting poorly this week, skipping, etc. While adjusting and cleaning it I found a broken link, the first one I've ever had. So I replaced it. I headed out for a ride today and the first time I stood on the pedals the chain slipped, throwing me forward and when I caught myself I'm pretty sure I tore my rotator cuff (I'd fallen on the CT ice 3 or 4 weeks ago and tweaked it pretty good. The slip today really hurt it.) So before heading to the emergency room for an X-ray, I went to get a new cassette. I returned from the hospital and put the cassette on and tried pedaling under a load and it still throws the chain violently. I put it on the stand and the chainrings are shark-toothed too, and need replaced. Typically, I have to change the cassette once per season. After today's debacle, I will never change the chain without changing the cassette. And inspect your chainrings!
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