Product Description
A03 Automatic 3-Speed Internal Gear Hub For City E-Bikes
Product Overview
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.
Key Features
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.
Technical Advantages / How It Works
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.
Applications
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.
Technical Parameters
| 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 |
FAQ
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.
