Bicycle headset bearing

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Bicycle headset bearing is a component of bicycle headset, which is the set of parts on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of the bicycle frame itself. Bicycle headset bearings are usually ball bearings. They provide a low friction contact between the bearing cup and the steerer.

Bearing No.	ID	OD	H	Chamfer º	Qty of Seal	Ref TH ind.	Material
ACB41K	30.15	41	6.5	36°/45°	2	TH-873	chrome steel
ACB39	30.15	39	6.5	45°/45°	2		chrome steel
ACB41H7	30.15	41	7	45°/45°	1		chrome steel
ACB418	30.15	41.8	6.5	45°/45°	2		chrome steel
ACB418H7	30.15	41.8	7	45°/45°	2		chrome steel
ACB418H8	30.6	41.8	8	45°/45°	1		chrome steel
ACB418H8F	30.6	41.8	8	45°/45°	1	TH-870	chrome steel
ACB44	30.15	44	8	45°/45°	2		chrome steel
ACB1645	40	52	7	45°/45°	2		chrome steel
ACB52	40	52	8	45°/45°	2		chrome steel
ACB1645/12	40	52	12	45°/45°	1		chrome steel
ACB518K	40	51.8	8	36°/45°	2	TH-073	chrome steel

Bearing No.	ID	OD	W	Seals	Seals Color	Cage
	30.15	41.00	6.50	Two different seals	Black	Nylon 66
MH-P03K	30.15	41.00	6.50	Two different seals	Blue	Nylon 66
MH-P04	30.15	39.00	6.50	Two different seals	Black	Nylon 66
MH-P08	30.45	41.80	6.50	Two different seals	Orange	Nylon 66
MH-P09K	27.15	38.00	6.50	Two different seals	Blue	Nylon 66
MH-P15	33.05	43.80	7.00	Two different seals	Black	Nylon 66
MH-P16	40.00	52.00	7.00	Two different seals	Black	Nylon 66
MH-03K & MH-P09K: Inner Ring with Black Oxide treatment.