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Premium ceramic replacement bearings for Bontrager Aeolus XXX and Aeolus D3 wheels;Only compatible with Bontrager rim-brake wheels with DT-Swiss internals;CeramicSpeed bearings reduce friction and improve performance and durability;400% smoother, 128% harder and 58% lighter than a standard steel bearing;Made from Grade 3 Silicon Nitrate €“ the highest possible grade;75% harder bearing race, further reducing friction and wear;Handmade in Denmark and used by numerous pro teams including Trek Factory Racing;
