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The Omega 8500 Movement Second Wheel (7228500A3002702) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement. As part of the wheel train, this second wheel transmits power from the barrel system to the escapement, playing a role in maintaining the movement’s stable rate and 60‑hour power reserve. Service guide documents confirm that the second wheel (reference 30027**) is an identified service part used during professional movement overhauls.
Genuine Omega part – authentic Swiss-made component for Caliber 8500
Wheel train component – transmits power from the barrel to the escapement
Precision-engineered – manufactured to Omega’s factory specifications
Service replacement part – listed in official technical documentation for professional servicing
Supports stable chronometric performance – works with the Co‑Axial escapement and free‑sprung balance system
Part Number: 7228500A3002702 (also listed as 30027** in manuals)
Compatible Movement: Omega Caliber 8500 (Co‑Axial automatic)
Movement Diameter: 29.00 mm (12¾”’)
Movement Height: 5.5 mm
Jewels: 39
Frequency: 25,200 vph (3.5 Hz)
Power Reserve: 60 hours (two series‑coupled barrels)
Origin: Switzerland (Omega factory part)
Condition: Brand new
Service and overhaul of Omega Caliber 8500 movements
Wheel train repair – replacing worn or damaged second wheels
Restoration of De Ville Hour Vision, Seamaster Aqua Terra, Constellation, and other 8500‑powered models
Suitable for professional watchmakers and authorized service centers
1. Is this a genuine Omega part?
Yes, this is a genuine Omega factory part (reference 7228500A3002702), manufactured in Switzerland. It appears in official Omega technical documentation as a service part for the 8500 caliber.
2. Which movement versions is this second wheel compatible with?
This second wheel (reference 30027**) is listed for Caliber 8500A and 8501A versions in technical documentation. Please verify your movement version before ordering.
3. What is the function of the second wheel in the Caliber 8500?
The second wheel is part of the wheel train that transmits power from the two series‑coupled barrels to the escapement. It works with the intermediate train wheel to deliver stable torque to the Co‑Axial escapement system.
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