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
SHIS:IS52/30
Upper/lower:Lower
Stack: 1mm
Compatibility:1-1/8″ straight steerer tubes to tapered 52mm 1.5″ IS bottom head-tubes
Color: Black
Weight: 67g










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