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This is a genuine Swiss-made ETA 2892-255 hour wheel (part no. 255), a key gear within the motion work of ETA calibers 2892, 2892-2 and 2892-A2 automatic movements. Mounted on the dial side of the movement, this hour wheel sits between the minute wheel and the hour hand tube, transmitting 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.
Genuine Quality： Factory‑produced by ETA Switzerland, brand new, fully compliant with original material and precision standards.
Compatible Movements： ETA 2892 (1975-1983), 2892-2 (1983-2000) and 2892-A2 (2000-present) series automatic calibers.
Part Number： ETA 2892-255 / 255.
Core Function： The hour wheel is the final component in the motion work. Through precise meshing with the minute wheel, it translates every 12 rotations of the minute wheel into 1 rotation of the hour wheel, driving the hour hand at the correct reduction ratio.
Construction： A precision‑hobbed steel wheel with a centre tube that fits over the minute wheel tube, ensuring proper interaction with the hour hand tube.
Repair Value： When the movement exhibits jerky date‑setting, irregular date change at midnight, or erratic hour‑hand movement, the hour wheel is often the culprit (worn teeth or an enlarged center bore) and must be replaced.
Q1: What failures are caused by a worn hour wheel?
A: Worn teeth cause irregular hour‑hand motion and uneven quick‑set resistance. An enlarged centre bore results in a loose hour hand after fitting. Severe wear can lead to complete quick‑set failure.
Q2: Can I use an aftermarket hour wheel?
A: Strongly not recommended. Aftermarket hour wheels often lack precise tooth geometry, proper material hardness, and correct centre tube dimensions. This can lead to excessive backlash, rapid wear, or even jamming. Always use genuine ETA parts.
Q3: Do I need to realign the hands after installing a new hour wheel?
A: Yes. After installing a new hour wheel, you must refit the hands and align them at 12 o’clock to ensure synchronisation between the hour and minute hands. It is advisable to install the hands with the date mechanism at the midnight reference point.
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