RoHS Drum 3 Speed Internal Gear Hub City E Bikes Automatic Internal Gear Hub

The Manual 3-Speed Internal Gear Hub is designed for city e-bikes, commuter bicycles and utility bike platforms that require stable manual shifting, sealed drivetrain protection and practical brake compatibility. This outside-fork version places the shift control structure outside the rear fork area, making installation, adjustment and service more accessible during vehicle assembly and maintenance.
With a 186% total gear range and three gear ratios of 0.73, 1.00 and 1.36, the hub supports daily riding needs such as smooth starting, steady cruising and moderate climbing. The sealed planetary gear system keeps the main transmission components enclosed inside the hub shell, helping reduce exposure to dust, mud, water and external impact compared with traditional external derailleur systems.
The LG-N3014-3G version is configured for drum brake applications. With 127 mm O.L.D., 189.5 mm axle length and 0.9 kg reference weight, it is suitable for urban e-bike and utility bicycle projects that require a manual 3-speed internal gear hub with drum brake integration and service-friendly outside-fork control.

• Manual 3-Speed Shifting: Allows riders to select gears directly for different road and load conditions.
• Outside-Fork Control Layout: Makes installation, cable adjustment and maintenance easier.
• Drum Brake Compatibility: Suitable for bicycle platforms using drum brake rear hub systems.
• 186% Gear Range: Supports starting, cruising and moderate climbing in daily urban riding.
• Sealed Planetary Gear Structure: Helps protect the internal transmission from dust, water and road contamination.
• Service-Friendly Design: Outside-fork shift control provides easier access for adjustment and inspection.
• Rear Hub Integration: Reduces exposed drivetrain components compared with derailleur-based systems.
• IPX6 Waterproof Rating: Suitable for regular outdoor riding and urban mobility applications.

This manual 3-speed internal gear hub uses a planetary gear transmission structure built inside the rear hub shell. The rider changes gears through a matched shifter, while the hub switches between three internal gear ratios. The low ratio supports easier starting and heavier pedaling conditions, the middle ratio is suitable for normal city riding, and the high ratio improves pedaling efficiency during faster cruising.
The outside-fork controller layout is especially useful for bicycle projects that require accessible installation and maintenance. Since the shift control structure is positioned outside the rear fork area, technicians can more easily adjust or inspect the system during production or after-sales service.
The drum brake configuration gives LG-N3014-3G a clear application difference from the roller brake, V brake and disc brake versions in the same M03 manual 3-speed series. It is a practical option for city e-bikes and utility bicycles that need enclosed internal gear shifting together with drum brake compatibility.
 

The LG-N3014-3G manual 3-speed internal gear hub is suitable for city e-bikes, commuter bicycles, utility bicycles and urban mobility platforms that require drum brake compatibility and stable manual shifting. It is especially useful for vehicle projects where a sealed internal gear hub, rear drum brake structure and outside-fork service access need to be combined in one rear wheel solution.
For riders, the three-speed gear range supports smoother starts, comfortable cruising and moderate climbing in daily use. For OEM bicycle brands, the sealed internal gear structure helps reduce drivetrain exposure, while the drum brake configuration provides a practical option for urban bicycle and utility bike designs.

Q1: Is LG-N3014-3G automatic or manual?
A1: LG-N3014-3G is a manual 3-speed internal gear hub. The rider changes gears through a matched shifter.
Q2: What is the total gear ratio?
A2: The total gear ratio is 186%. The three gear ratios are 0.73, 1.00 and 1.36.
Q3: What brake type does this model support?
A3: This model is configured for drum brake applications.
Q4: What is the advantage of the outside-fork control layout?
A4: The outside-fork layout places the shift control structure outside the rear fork area, making installation, adjustment and maintenance more accessible.
Q5: How is this model different from the V brake or disc brake versions?
A5: LG-N3014-3G is the drum brake version. The V brake and disc brake versions use different brake interfaces, O.L.D. values and frame-matching requirements.
Q6: What should be confirmed before using this model in an OEM project?
A6: The frame O.L.D., drum brake compatibility, rear fork structure, shifter model, chainline, spoke specification and installation space should be confirmed before sampling or production.