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The Omega 8500 Movement Driving Wheel For Barrel One (7228500A31066) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement . As a critical part of the dual‑barrel winding system, this driving wheel meshes with barrel one to transmit winding torque during both manual and automatic winding operations . It is a recognized service part listed for Caliber 8500A in the official Omega spare parts list .
Genuine Omega part – authentic Swiss‑made component listed for Caliber 8500A
Dual‑barrel system component – meshes with barrel one to transmit winding torque
Manual winding function – works with the manual winding mechanism to wind barrel one
Automatic winding function – receives drive from the automatic winding train
Service replacement part – recognized in official Omega technical documentation
Part Number: 7228500A31066
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
Winding system repair – replacing worn or damaged driving wheels
Manual winding restoration – restoring smooth crown winding operation
Automatic winding restoration – ensuring efficient self‑winding function
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 7228500A31066), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list as “Driving wheel for barrel one” for Caliber 8500A .
2. Which movement versions is this component compatible with?
This driving wheel 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 driving wheel for barrel one?
The driving wheel for barrel one meshes with the teeth of barrel one to transmit winding torque . In the manual winding system, it receives force from the reduction wheel to manually wind barrel one. In the automatic system, it is driven by the transmission wheel for ratchet wheels . The torque from barrel one is then transmitted to barrel two through the ratchet wheels .
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