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My wife's bike is on her 3rd or 4th chain and the X01 cassette is still going strong. She's replaced the chainring once and we've bent the derailleur back into shape. Around 3,000 or so miles of real singletrack riding, so it seems to hold up amazingly well. I was definitely skeptical beforehand. I'm on my 2nd Shimano cassette in the past 6 months...
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