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The Omega 8500 Movement First Wheel (7228500A30014) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement. As the initial gear in the wheel train, this first wheel receives power directly from the barrel system and transmits it onward to the subsequent gears of the train, playing a foundational role in the movement’s power flow and stable timekeeping .
Genuine Omega part – authentic Swiss-made component listed for Caliber 8500 series
Wheel train component – first gear in the power transmission chain from the barrel system
Essential for power flow – transfers energy from the mainspring to the gear train
Service replacement part – recognized in official Omega technical documentation
Precision-engineered – manufactured to Omega’s factory specifications
Part Number: 7228500A30014
Compatible Movement: Omega Caliber 8500A, 8500B, 8500G
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)
Escapement Type: Co‑Axial
Origin: Switzerland (Omega factory part)
Condition: Brand new
Service and overhaul of Omega Caliber 8500 series movements
Wheel train repair – replacing worn or damaged first wheels
Power transmission restoration – ensuring stable torque delivery to the escapement
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 7228500A30014), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list as “First wheel”.
2. Which movement versions is this component compatible with?
This first wheel is listed for Omega Caliber 8500A, 8500B, and 8500G versions. For the METAS-certified Master Chronometer versions (8900/8901), a different reference may be required. Please verify your movement version before ordering.
3. What is the function of the first wheel?
The first wheel is the first gear in the wheel train that receives power directly from the barrel system (two series-coupled barrels) and transmits it to the intermediate train wheel, beginning the chain of power delivery to the escapement.
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