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The Omega 8500 Movement Reduction Wheel For Manual Winding (7228500A32029) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement . This reduction wheel is an essential part of the manual winding mechanism, transmitting force from the crown to the dual-barrel system for reliable mainspring winding . It is recognized in the official Omega 8500 spare parts list for version 8500A, where it is listed under “Reduction wheel for manual winding” .
Genuine Omega part – authentic Swiss-made component listed for Caliber 8500A
Manual winding mechanism component – transmits force from the crown to the barrel system
Works with the dual-barrel system – forms part of the 60‑hour power reserve mechanism
Service replacement part – recognized in official Omega technical documentation
Precision-engineered – manufactured to Omega’s factory specifications
Part Number: 7228500A32029
Compatible Movement: Omega Caliber 8500A
Movement Diameter: 29.00 mm
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 8500A movements
Manual winding repair – replacing worn or damaged reduction wheels
Restoration of De Ville Hour Vision, Seamaster Aqua Terra, 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 7228500A32029), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list under “Reduction wheel for manual winding” .
2. Which movement versions is this component compatible with?
This part is specifically listed for Omega Caliber 8500A in the technical documentation. For other versions (8500B, 8500G, and 8900), different references may be required. Please verify your movement version before ordering .
3. What is the function of the reduction wheel for manual winding?
The reduction wheel is part of the manual winding mechanism that transmits rotational force from the crown to the barrel system. It works with the barrel one driving wheel to wind the mainspring when the crown is turned manually . In the Caliber 8500’s dual-barrel system, this allows the user to manually wind both barrels for the 60‑hour power reserve.
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