Product details

1. Premium ceramic replacement bearings for Bontrager Aeolus XXX & Aeolus D3 wheels
2. Only compatible with Bontrager rim-brake wheels with DT-Swiss internals
3. CeramicSpeed bearings reduce friction and improve performance & durability
4. 400% smoother, 128% harder, and 58% lighter than a standard steel bearing
5. Made from Grade 3 Silicon Nitrate - the highest possible grade
6. Handmade in Denmark and used by numerous pro teams including Trek Factory Racing