ETA 7750-1481 Reduction Wheel

Product Description

Genuine ETA 7750-1481 Reduction Wheel, Made in Switzerland, brand new — the original factory gear component for the ETA/Valjoux 7750 chronograph movement’s automatic winding system. Precisely engineered to reduce rotational speed from the oscillating weight and transmit torque to the mainspring barrel, the reduction wheel ensures efficient automatic winding of the mainspring. An essential replacement part for restoring worn or damaged reduction wheel during movement service. Original ETA part — the professional’s choice for genuine automatic winding restoration.

Features & Function

• Genuine ETA 7750-1481 — original Swiss-made factory part, brand new, authentic, part number 7750-1481
• Automatic winding reduction gear — reduces rotational speed from the oscillating weight and transmits torque to the mainspring barrel
• Efficient power transfer — optimizes the gear ratio between the rotor and mainspring for effective automatic winding
• Critical winding train component — essential for converting rotor motion into mainspring tension
• Original factory quality — exact dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of worn, damaged, or stripped reduction wheel in the ETA/Valjoux 7750 movement
• Repair of automatic winding failures: rotor spinning freely without winding, insufficient power reserve, or grinding noise
• Professional movement service, overhaul, and chronograph restoration
• Certified watchmaker and service center parts supply
• Restoration of 7750-based chronograph movements (IWC, Omega, Tag Heuer, Breitling, and other brands using 7750)

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-1481 Reduction Wheel, Made in Switzerland, brand new. It is an original factory part from ETA (Swatch Group), the world’s leading movement manufacturer. Not a generic or replica part.

Q2: How do I confirm this part fits my movement?
A: Confirm your movement is an ETA/Valjoux 7750 chronograph with automatic winding. The part number 7750-1481 is the specific reduction wheel for this movement’s automatic winding train. Common brand applications include: IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform.

Q3: What does the reduction wheel do in the automatic winding system?
A: The reduction wheel is a gear in the automatic winding train. When the oscillating weight (rotor) spins, it rotates at high speed with low torque. The reduction wheel reduces the rotational speed and increases the torque transmitted to the mainspring barrel — converting the rotor’s fast rotation into the slow, high-torque winding motion needed to tension the mainspring. A worn reduction wheel causes inefficient winding, power reserve issues, or rotor spinning freely without winding.

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