This is a 40-series Integrated IS52 Bottom headset that has a Crown Race diameter of 39.79mm 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
Specifications:
SHIS: IS52/39
Upper/lower: Lower
Stack: 1mm
Compatibility: 1-1/8" straight steerer tubes to tapered 52mm 1.5" IS bottom head-tubes
Color: Black
Weight: 43g
This product was added to our catalog on June 18, 2019