A03 Automatic 3-Speed Internal Gear Hub For City E-Bikes
| Product Series: | A03 Automatic 3-Speed Internal Gear Hub | Product Category: | Automatic Gear Hub |
| Application: | City E-Bikes / Commuter OEM Projects | Target Buyer: | City E-Bike Brands / Commuter Bicycle OEMs |
| Technology: | CentriGear Mechanical Automatic Shifting | Shifting Principle: | Centrifugal Force + Planetary Gear Operation |
| Drive Versions: | LG-N7118-3D Chain Drive / LG-N7122-3D Belt Drive | Gear Range: | 166% Total Gear Ratio |
| Brake Type: | 6-Bolt Disc Brake | ||
| High Light: | Hub Motor Gearbox 148mm,electric Hub Motor Gearbox,hub gear electric bike ODM |
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A03 is a mechanical automatic 3-speed internal gear hub for city e-bikes, commuter bicycles and OEM projects that need automatic shifting without electronic control. It uses CentriGear shifting technology, combining centrifugal-force triggering with planetary gear operation to support start, cruising and higher-speed riding conditions.
The A03 series includes chain drive and belt drive model directions. LG-N7118-3D is the chain drive version for practical city e-bike and commuter OEM projects. LG-N7122-3D is the belt drive version for premium city e-bikes and low-maintenance platforms.
With 166% total gear range, 6-bolt disc brake compatibility, 135 mm O.L.D., 184 mm axle length, IPX6 protection and 1.64 kg average weight, A03 provides a clear automatic 3-speed internal gear hub direction for urban vehicle development.
Mechanical Automatic 3-Speed Hub: No electronic controller required for shifting.
CentriGear Shifting Technology: Uses centrifugal force and planetary gear operation.
166% Total Gear Range: Covers starting, cruising and higher-speed city riding.
Chain And Belt Drive Versions: Supports different drivetrain planning directions.
6-Bolt Disc Brake Matching: Source-backed brake type for this replacement page.
135 mm O.L.D.: Suitable for city e-bike and commuter OEM review.
Sealed Internal Gear Structure: Helps reduce exposed shifting parts.
A03 changes gear ratios through centrifugal-force triggering and planetary gear operation. The hub automatically supports common riding stages such as starting, cruising and higher-speed city riding without requiring an electronic controller or manual shifter.
A03 is suitable for city e-bikes, commuter bicycles, urban utility e-bikes and OEM projects that need automatic 3-speed shifting, sealed construction and lower routine maintenance.
| Parameter | LG-N7118-3D | LG-N7122-3D |
|---|---|---|
| Drive Type | Chain Drive | Belt Drive |
| Speed Level | 3 Speed | 3 Speed |
| Total Gear Ratio | 166% | 166% |
| Gear Ratios | 1.00 / 1.29 / 1.66 | 1.00 / 1.29 / 1.66 |
| Brake Type | 6-Bolt Disc Brake | 6-Bolt Disc Brake |
| Spoke Size | #13 / #14 | #13 / #14 |
| O.L.D. | 135 mm | 135 mm |
| Axle Length | 184 mm | 184 mm |
| Chainline G1 | 49 mm | 57 mm |
| Chainline G2 | 43.4 mm | Not Provided |
| Offset | 2.4 mm | 2.38 mm |
| Thread Size | JIS BC3/8-26 | JIS BC3/8-26 |
| Spoke Hole Diameter | 3.2 mm | 3.2 mm |
| Spoke Hole Number | 36H | 36H |
| Disc Brake Mounting Width | 13 mm | 13 mm |
| Color | Black | Black |
| Matching Cog | Chain Sprocket / Threaded Buckle | 9-Tooth Belt Cog, 6.2 mm Slot |
| Average Weight | 1.64 kg | 1.64 kg |
| Operating / Storage Temperature | -30-80°C / -40-85°C | -30-80°C / -40-85°C |
| Waterproof Rating | IPX6 | IPX6 |
| Certification | RoHS / REACH | RoHS / REACH |
Q: Is A03 an electronic shifting hub? A: No. A03 is a mechanical automatic 3-speed internal gear hub.
Q: What is the difference between LG-N7118-3D and LG-N7122-3D? A: LG-N7118-3D is the chain drive version. LG-N7122-3D is the belt drive version.
Q: Can this page mention V-Brake? A: No. The A03 source document supports 6-Bolt Disc Brake.
Q: Does A03 require a manual shifter? A: No. A03 is designed as a mechanical automatic internal gear hub.
