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The Omega 8500 Movement Transmission Wheel For Ratchet (7228500A3208319) is a genuine Swiss-made component for the Omega Caliber 8500 Co-Axial automatic movement. This transmission wheel is a critical part of the dual-barrel winding system, engaging with the ratchet wheels to transfer torque between barrel one and barrel two during automatic winding. It is typically replaced during professional servicing when wear or irregular winding performance is detected.
Genuine Omega part – authentic Swiss-made component for Caliber 8500
Dual-barrel system component – transmits torque between the two series-coupled barrels during automatic winding
Plays a key role in power reserve – works with ratchet wheels to maintain the movement’s 60-hour power reserve
Precision-engineered – manufactured to Omega’s factory specifications
Direct replacement – designed for professional servicing and restoration
Part Number: 7228500A3208319
Compatible Movement: Omega Caliber 8500A, 8500B, 8500G
Movement Diameter: 29.00 mm (12¾”’)
Movement Height: 5.5 mm
Jewels: 39
Frequency: 25,200 vph (3.5 Hz)
Power Reserve: 60 hours (from two series-coupled barrels)
Origin: Switzerland (Omega factory part)
Condition: Brand new
Service and overhaul of Omega Caliber 8500A/B/G movements
Winding system repair – replacing worn or damaged transmission 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 7228500A3208319), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list under “Transmission wheel for ratchet wheels”.
2. Which movement versions is this transmission wheel compatible with?
This transmission wheel is listed for Omega Caliber 8500A, 8500B, and 8500G versions. Please verify your movement version before ordering.
3. What is the function of the transmission wheel for ratchet?
The transmission wheel engages with the ratchet wheels to transfer torque between barrel one and barrel two during automatic winding, enabling the dual-barrel system to store 60 hours of power reserve.
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