- Ceramic bearings provide superior smoothness, reduced weight and extended bearing life
- Grade 5 Silicon Nitride ceramic balls, Chromium steel races with triple cryogenic treatment, filled with Kyodo Yushi grease for ceramic bearings
- Super light Delrin wheels with aluminum dust covers
- XD-11 pulleys have narrow/wide tooth profile for use on XX1 and X01 rear derailleurs
- Sold as pair (8.7g/pair)
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