ETA 7750-201 Great Wheel

Product Description

The ETA 7750-201 Great Wheel is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. As the first wheel in the gear train, the great wheel is mounted on the mainspring barrel and is responsible for transmitting power from the mainspring to the rest of the gear train, ensuring consistent energy delivery to the center wheel and ultimately the escapement. This brand new original part is essential for watchmakers restoring proper power transmission and timekeeping accuracy when the original great wheel becomes worn or damaged.

Features & Function

• Genuine ETA/Valjoux part – authentic Swiss-made component for the ETA 7750 movement

• First wheel in the gear train – mounted on the mainspring barrel for primary power transmission

• Critical for power delivery – ensures consistent energy flow to the center wheel and escapement

• Direct replacement – drop-in replacement for worn or damaged great wheels

• Precision-engineered – manufactured to ETA’s original specifications

Specifications

• Part Number: 7750-201

• Compatible Movements: ETA/Valjoux 7750, 7751, 7753, 7754, 7760, 7765

• Function: First wheel in the gear train (mainspring barrel drive)

• Movement Diameter: 30.0 mm

• Movement Height: 7.9 mm

• Jewels: 25

• Frequency: 28,800 vph (4 Hz)

• Power Reserve: 42–48 hours

• Origin: Switzerland (ETA factory part)

• Condition: Brand new

Applications

• Service and overhaul of ETA 7750-series movements

• Gear train repair – replacing worn or damaged great wheels

• Power transmission restoration – ensuring stable energy flow to the escapement

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine ETA part?
Yes, this is a genuine ETA factory part (reference 7750-201), made in Switzerland. It is not an aftermarket or generic copy.

2. Which movements is this great wheel compatible with?
This great wheel is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7760, and 7765.

3. What is the function of the great wheel?
The great wheel is the first wheel in the gear train, mounted on the mainspring barrel. It transmits power from the mainspring to the center wheel, ensuring consistent energy delivery to the escapement for stable timekeeping.

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