IPX6 Waterproof Automatic Gear Hub Urban Bike Three Speed Internal Hub
| Reference Product Family: | A03 Automatic 3-Speed Internal Gear Hub Series | Application Focus: | Premium City Bikes / Smooth Urban Riding |
| Target Vehicle Type: | Premium City E-Bikes / Urban Commuter Bikes / OEM Clean Drivetrain Projects | Shifting Positioning: | CentriGear Automatic Mechanical Shifting Without Rider-Operated Gear Selection |
| Rear Hub Integration: | Sealed Internal Gear Hub For Cleaner Premium City Bike Design | Brake Matching Options: | 6-Bolt Disc Brake |
| Outdoor Use: | IPX6 Waterproof Rating | Technical Data Source: | Detailed Values Follow The A03 Family Common Parameters And SKU Difference Reference Table. |
| High Light: | IPX6 Waterproof Automatic Gear Hub,Automatic Gear Hub urban bike OEM,Smooth three speed internal hub |
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The Automatic 3-Speed Internal Gear Hub For Premium City Bikes is designed for OEM urban e-bike projects that need smooth automatic riding, clean rear hub integration and a more refined commuter drivetrain. It is positioned around the Lofandi A03 automatic 3-speed internal gear hub family, with the application focus placed on premium city bikes and smooth daily urban riding.
For riders, the value of A03 is the automatic mechanical shifting experience. The CentriGear system changes gears according to riding speed through an internal mechanical structure, so the rider does not need to operate a handlebar shifter during everyday starts, cruising and moderate city slopes. This supports a calm and easy riding feel for premium commuter e-bikes.
For OEM city bike brands, the A03 family provides two practical development directions. The chain-drive version is suitable for conventional city e-bike platforms, while the belt-drive version supports cleaner, quieter and lower-maintenance premium builds. Both directions keep the transmission system inside the rear hub shell for a more integrated city bike drivetrain.
- Premium City Bike Positioning: Designed for urban e-bike projects that need smooth riding and clean drivetrain integration.
- Automatic 3-Speed Riding Experience: Supports starts, cruising and moderate city riding without rider-operated gear selection.
- CentriGear Mechanical Shifting: Uses automatic mechanical shifting based on riding speed rather than electronic shift control.
- Chain And Belt Drive Directions: Offers a practical chain-drive version and a cleaner belt-drive version for premium city bike projects.
- Sealed Internal Hub Structure: Keeps the main gear mechanism inside the rear hub shell for a protected drivetrain layout.
- 6-Bolt Disc Brake Matching: Supports modern city e-bike rear-wheel braking layouts within the A03 family.
- OEM Premium Platform Matching: Final SKU selection can follow chainline, belt-line, cog matching, frame structure and wheel requirements.
- Low-Routine-Operation Appeal: Reduces rider-side shifting actions and supports a simpler premium commuter experience.
| Parameter | Specification |
|---|---|
| Product Family | A03 Automatic 3-Speed Internal Gear Hub Series |
| Reference Models | LG-N7118-3D / LG-N7122-3D |
| Product Category | Automatic Gear Hub |
| Speed Level | 3 Speed |
| Total Gear Ratio | 166% |
| Gear Ratios | 1.00 / 1.29 / 1.66 |
| Shifting Technology | CentriGear Automatic Mechanical Shifting |
| Brake Type | 6-Bolt Disc Brake |
| Spoke Size | #13 / #14 |
| O.L.D. | 135 mm |
| Axle Length | 184 mm |
| Disc Brake Mounting Width | 13 mm |
| Color | Black |
| Average Weight | 1.64 kg |
| Operating / Storage Temperature | -30-80℃ / -40-85℃ |
| Waterproof Rating | IPX6 |
| Certification | RoHS / REACH |
| Reference Model | Drive Type | Matching Cog | Chainline G1 / G2 | Best Application |
|---|---|---|---|---|
| LG-N7118-3D | Chain Drive | Chain Sprocket / Threaded Buckle | 49 / 43.4 mm | Chain drive city e-bikes and commuter OEM projects |
| LG-N7122-3D | Belt Drive | 9-Tooth Belt Cog, 6.2 mm Slot | 57 / Not Provided | Belt drive premium city e-bikes and low-maintenance platforms |
The A03 automatic internal gear hub uses CentriGear mechanical shifting combined with planetary gear transmission. As riding speed changes, the internal mechanism shifts gears automatically, giving riders a smoother city riding experience without requiring manual gear selection.
The sealed rear hub structure helps protect the internal transmission mechanism from road dust, mud and rainwater during daily city use. For premium city bike projects, this supports a cleaner appearance and a more integrated drivetrain than exposed external shifting systems.
The final A03 model should be selected according to drivetrain layout. Chain-drive projects can review the LG-N7118-3D direction, while clean belt-drive projects can review the LG-N7122-3D direction. OEM teams should confirm chainline or belt-line, cog matching, brake interface and frame compatibility before sampling.
This automatic 3-speed internal gear hub solution is suitable for premium city e-bikes, urban commuter bicycles, clean drivetrain projects and OEM city bike platforms that require automatic mechanical shifting and a refined rear hub layout.
It is especially useful for premium commuter projects where smooth riding, reduced rider-side shifting, sealed hub protection and chain or belt drive matching are important product development requirements.
Before sampling or production, OEM customers should confirm drive system, chainline or belt-line, belt cog or chain sprocket matching, brake interface, frame O.L.D., spoke specification, rear fork structure, wheel specification and final image/SKU matching.
