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This is a genuine IWC balance wheel for Caliber 51011 automatic movement, Swiss‑made. The balance wheel is the core regulating component of the movement, working with the hairspring to produce a stable oscillation frequency, controlling timekeeping accuracy. Caliber 51011 is part of IWC‘s renowned 51000 series long‑power‑reserve movements, featuring the Pellaton automatic winding system and a 7‑day (168‑hour) power reserve. This original factory balance wheel is the ideal choice for replacing a damaged or worn balance assembly during service or repair.
Genuine IWC Part – Swiss factory‑original for Caliber 51011, not a copy.
High‑Precision Regulating Core – Works with the hairspring to maintain a stable 28,800 vph (4 Hz) frequency.
Glucydur Balance Wheel – Classic beryllium‑copper alloy, anti‑magnetic, corrosion‑resistant, thermally stable.
Adjustable Balance Screws – Equipped with timing screws for precise static poising adjustment.
Essential for Service – Replace when the balance staff is broken, the wheel is deformed, or the balance cannot be corrected.
| Parameter | Details |
|---|---|
| Part Name | Balance Wheel |
| Compatible Movement | IWC Caliber 51011 automatic (and 51000 series platform calibers) |
| Movement Specs | Diameter 37.8 mm, height 7.2 mm, 44 jewels, 28,800 vph |
| Power Reserve | 7 days (168 hours) |
| Balance Material | Glucydur (beryllium‑copper alloy) |
| Hairspring Type | Flat (not Breguet overcoil) |
| Shock Protection | Incabloc |
| Origin | Switzerland |
| Condition | Brand new, genuine |
IWC Caliber 51011 automatic movement (e.g., Big Pilot 5002, 5004; Portuguese Automatic 5001, etc.).
Replacement of balance wheels with broken staffs, deformed rims, or severe imbalance during movement service.
Repair of severe timekeeping errors, low amplitude, or stoppage caused by balance issues.
1. Is this a genuine IWC balance wheel?
Yes. It is a Swiss factory‑original part for Caliber 51011, not a copy.
2. What are the symptoms of a damaged balance wheel?
Symptoms: very fast or slow timekeeping; very low amplitude; stoppage or intermittent running; rattling noise when shaken (broken staff); inability to regulate accuracy with the regulator.
3. What should I pay attention to during installation?
Install the balance complete together with its bridge. Ensure both pivots drop into the shock absorber jewels. Clean and apply a tiny amount of dedicated balance oil to the pivots. Follow the IWC technical guide. Professional installation is strongly recommended.
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