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The Omega 8500 Movement Intermediate Train Wheel (7228500A30025) is a genuine Swiss-made component for the Omega Caliber 8500 Co‑Axial automatic movement . As an essential part of the wheel train, this intermediate wheel transmits energy from the barrel system to the escapement, contributing to the movement’s stable timekeeping and 60‑hour power reserve . It is a recognized service part listed in the official Omega 8500 spare parts list, fitted during the wheel train assembly stage .
Genuine Omega part – authentic Swiss-made component listed for Caliber 8500 and 8501 series
Wheel train component – transmits power from the barrels to the escapement system
Critical for timekeeping – ensures stable energy transfer and consistent rate
Service replacement part – recognized in official Omega technical documentation
Precision-engineered – manufactured to Omega’s factory specifications
Part Number: 7228500A30025
Compatible Movements: Omega Caliber 8500A, 8500B, 8501A, 8501B
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 8500/8501 series movements
Wheel train repair – replacing worn or damaged intermediate train wheels
Timekeeping restoration – ensuring consistent amplitude and rate
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 7228500A30025), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list as “Intermediate train wheel” .
2. Which movement versions is this component compatible with?
This intermediate train wheel is listed for Omega Caliber 8500A, 8500B, 8501A, and 8501B versions in the official technical documentation . 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 intermediate train wheel?
The intermediate train wheel is part of the wheel train that transmits power from the two series‑coupled barrels to the escapement . It works with the seconds wheel and intermediate escapement wheel to deliver stable torque to the Co‑Axial escapement system .
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