Thread: Ultegra CS-R800 11 Speed Cassette - Runs Rough
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  #8  
Old 06-12-2019, 05:40 PM
John H. John H. is offline
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Join Date: Mar 2004
Posts: 4,642
Chain
I would try a new chain- But I did have an 8000 cassette that had a bad cog. Mine was 3rd one down from the 34, so 27?
Never ran right on multiple bikes with different chains. Shimano warrantied it and gave me a new cassette.
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