135mm Chain Drive Drum 56mm 50.8mm Brake Lock Hub
LG-N7003-2G is the drum brake lock version of the A02 automatic 2-speed internal gear hub. Its main value is the combination of mechanical self-shifting and drum brake lock matching, making it a practical option for low-maintenance city bicycles, public-use e-bikes and urban mobility platforms that require a protected rear hub brake layout.
Compared with the disc brake versions, this model uses a 135 mm O.L.D. structure, 56 mm G1 chainline, 50.8 mm G2 chainline and 30.8 mm brake mounting width. These differences should be checked carefully during frame and brake system matching.
- Automatic 2-speed shifting reduces rider operation during daily city riding.
- 133% total gear range supports easier starting and efficient cruising.
- Sealed internal gear structure helps protect transmission parts from dust, mud and rainwater.
- Chain Drive System configuration for the target drivetrain layout.
- Drum Brake Lock matching for the selected rear brake structure.
- 135 mm O.L.D. rear hub structure for frame matching.
- IPX6 waterproof rating and RoHS / REACH certification support international product planning.
The A02 series uses a mechanical automatic shifting structure based on CentriGear shifting logic. As riding speed changes, the internal mechanism shifts between the 1.00 and 1.33 ratios without a handlebar shifter. This gives daily riders a simpler experience, while helping OEM brands create a cleaner rear drivetrain layout with fewer exposed shifting components.
This model is best used for city e-bikes and low-maintenance bicycle platforms requiring integrated drum brake lock matching. It is especially relevant for OEM projects where the buyer wants a lower-maintenance alternative to exposed external shifting, but still needs the hub to match a specific brake interface, dropout width and drivetrain line.
| Parameter | LG-N7003-2G |
|---|---|
| Product Type | Automatic 2-Speed Chain Drive Version |
| Product Category | Automatic Gear Hub |
| Speed Level | 2 Speed |
| Total Gear Ratio | 133% |
| Gear Ratio 1 | 1.00 |
| Gear Ratio 2 | 1.33 |
| Brake Type | Drum Brake Lock |
| Spoke Size | #13 / #14 |
| O.L.D. | 135 mm |
| Axle Length | 180 mm |
| Chainline G1 | 56 mm |
| Chainline G2 | 50.8 mm |
| Offset | 3.85 mm |
| Axle Length From Hub, Left | 23 mm |
| Axle Length From Hub, Right | 23 mm |
| Thread Size | JIS BC3/8-26 |
| Spoke Hole Diameter | 3.2 mm |
| Spoke Hole Number | 36H |
| Brake Mounting Width | 30.8 mm |
| Color | Silver |
| Matching Belt Cog | Not Provided |
| Average Weight | 1.3 kg |
| Operating / Storage Temperature | -30–80℃ / -40–85℃ |
| Waterproof Rating | IPX6 |
| Certifications | ROHS / REACH |
Before sampling, OEM customers should provide frame drawings, rear dropout spacing, brake type, wheel size, spoke requirements, chainline or belt-line target, axle compatibility and expected use scenario. Lofandi can support model selection, drawing confirmation, sample preparation and installation matching according to the final vehicle platform.
Q: What is this model best suited for?
A: City e-bikes and low-maintenance bicycle platforms requiring integrated drum brake lock matching.
Q: How is this model different from the other A02 versions?
A: Drum brake lock configuration, 135 mm O.L.D., wider G1 56 mm and G2 50.8 mm chainline, 30.8 mm brake mounting width.
Q: Does it require manual shifting?
A: No. The A02 series uses a mechanical automatic 2-speed shifting structure and does not require a manual shift lever for normal riding.
Q: What should be confirmed before sampling?
A: Confirm rear frame O.L.D., brake interface, chainline or belt line, spoke specification, axle matching, wheel build and target riding scenario.
Q: Can Lofandi support OEM project matching?
A: Yes. OEM support can include product selection, drawing review, drivetrain matching, sample preparation and project validation according to the vehicle requirements.
Q: What ordering information should buyers provide?
A: Please provide expected order volume, sample quantity, target market, vehicle type, configuration requirements and validation schedule. Price, MOQ and lead time should be confirmed after project details are clear.
Q: What quality or compliance information is available?
A: The source parameter table lists IPX6 and RoHS / REACH. Additional compliance documents or test reports should be confirmed according to project and market requirements.
Q: Is it suitable for shared or fleet bicycles?
A: It can be considered for shared or fleet-style city bicycles when the frame, brake structure and maintenance requirements match the selected model. Final use should be confirmed through project validation.
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