This is a 40-series Integrated IS52 Bottom headset that has a Crown Race diameter of 30.015mm and a bottom stack height of 1mm.
Features:
- Strong seal, can cross with other 40 series bearings and headset parts
- Bearings are black oxide sealed
- Durable steel crown race with low-friction face-seals
| (2) Lower SHIS | IS52/30 |
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