ETA 2892-255 Hour Wheel

Product Description

The ETA 2892-255 Hour Wheel is a genuine Swiss-made component for the ETA 2892, 2892-2, and 2892-A2 automatic movements. As a key gear within the motion work, this hour wheel is mounted on the dial side of the movement, sitting between the minute wheel and the hour hand tube. It transmits rotational power from the motion work to the hour hand at a 12:1 reduction ratio. As an OEM replacement part, it is the most reliable solution for professional watchmakers when repairing hand-driving failures caused by worn teeth, enlarged center bores, or sticky hands.

Features & Function

• Genuine ETA part – authentic Swiss-made component for ETA 2892 family movements

• Motion work component – transmits rotational power from the motion work to the hour hand

• 12:1 reduction ratio – ensures correct hour hand positioning relative to the minute hand

• Dial side mounted – positioned on the dial side of the movement for direct hour hand drive

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

Specifications

• Part Number: 2892-255 / 255

• Compatible Movements: ETA 2892, 2892-2, 2892-A2

• Movement Diameter: 25.6 mm (11½”’)

• Movement Height: 3.60 mm

• Jewels: 21

• Frequency: 28,800 vph (4 Hz)

• Power Reserve: ~42 hours

• Origin: Switzerland (ETA factory part)

• Condition: Brand new

Applications

• Service and overhaul of ETA 2892 family movements

• Motion work repair – replacing worn or damaged hour wheels

• Hand-driving restoration – resolving issues caused by worn teeth, enlarged center bores, or sticky hands

• 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 2892-255), made in Switzerland. It is listed in authorized supply catalogs for ETA 2892 family movements.

2. Which movements is this hour wheel compatible with?

This hour wheel is compatible with ETA 2892, 2892-2, and 2892-A2 movements. The 2892-A2 is a 25.6 mm automatic movement with a slim 3.6 mm height, extensively used by mid-range and high-end brands such as IWC, Omega, and Cartier.

3. What is the function of the hour wheel?

The hour wheel is part of the motion work that transmits rotational power from the motion work to the hour hand at a 12:1 reduction ratio. It sits between the minute wheel and the hour hand tube on the dial side of the movement.

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