Ceramic Headset bearing for Giant&Liv OverDrive TCR Defy CONTEND FastRoad LANGMA

Won't fit OverDrive 2. Lower headset bearing: 30x41.8x6.5. Upper Headset bearing: 34x46.9x7. Bearing Race Material: P6 bearing steel. Bearing Ball Material: P6 bearing steel. Bearing Ball Material:Nitrided Silicon Ceramic SI3N4.

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