CeramicSpeed Pulley Wheels for Shimano 11-Speed - 12 Tooth Narrow Wide Alloy Black. CeramicSpeed pulley wheels reduce friction last 3-5 time longer than stock high-end pulleys and are designed to work with less drag.Premium Grade 3 Silicon Nitride Ceramic
CeramicSpeed Pulley Wheels for Shimano 11-Speed – 12 Tooth Narrow Wide Alloy Black. CeramicSpeed pulley wheels reduce friction last 3-5 time longer than stock high-end pulleys and are designed to work with less drag.
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