Sealed 3 Speed Internal Gear Hub 120mm Shared City Bicycles OEM Hub Gear Bikes

The Sealed 3-Speed Internal Gear Hub is designed for shared city bicycles, commuter e-bikes and OEM urban mobility projects that need reliable manual shifting, a protected drivetrain and easier rear-wheel service. It uses the LG-N3010-3R M03 fork-out roller brake configuration as the reference structure, but the product positioning is focused on shared fleet bicycles where clean integration, repeatable maintenance and long-term urban operation matter more than decorative drivetrain complexity.

For shared bicycle operators, the hub helps create a simpler and more controlled rear wheel system. The internal gear mechanism is enclosed inside the hub shell, reducing the exposure of shifting parts to weather, mud, dust and daily public-use wear. Compared with external derailleur layouts, this sealed structure is easier to protect and better suited to bicycles that need frequent outdoor use with limited rider-side maintenance.

The outside-fork control layout gives this product its application difference. It makes the shift control area easier to reach during assembly, adjustment and service, which is valuable for OEM projects and shared city bicycle fleets. Together with roller brake compatibility and a compact rear hub layout, the product supports practical city bicycle designs where durability, service access and stable rider experience need to work together.

• Sealed 3-Speed Hub Structure: Protects the internal planetary gear system from dust, water and daily road contamination.
• Manual Gear Control: Allows riders to select gears directly according to starting, cruising and moderate climbing needs.
• Outside-Fork Control Layout: Improves access for installation, adjustment and maintenance around the rear hub area.
• City Riding Gear Coverage: Supports everyday starting, cruising and moderate climbing needs for urban bicycle use.
• Roller Brake Compatibility: Matches city bike and shared bicycle platforms using roller brake systems.
• Shared Fleet Suitability: Supports lower-maintenance rear hub planning for urban mobility and rental bicycle projects.
• Compact Rear Hub Design: Supports practical city bicycle frame design without adding exposed shifting components.
• Outdoor Mobility Protection: Suitable for daily commuting, shared bicycle operation and regular outdoor riding conditions.

Technical Parameters

Technical Advantages / How It Works

This sealed manual internal gear hub uses a planetary gear mechanism built inside the rear hub shell. When the rider operates a matched LL-3S series shifter, the hub changes between practical city riding gears for starts, cruising and moderate road gradients. The shifting experience remains simple for riders while the working mechanism stays protected inside the rear wheel assembly.

The outside-fork control layout is especially useful for shared bicycle and OEM platforms that need accessible adjustment around the rear wheel. Maintenance teams can check the shifter connection, cable routing and rear hub installation more conveniently, which helps reduce service friction when many bicycles use the same drivetrain specification.

Because the main gear mechanism is enclosed inside the hub, the drivetrain has fewer exposed shifting components than an external derailleur system. For OEM city bike brands and shared mobility operators, this supports a cleaner rear-wheel appearance, better protection against daily road conditions and a more service-friendly manual shifting solution for repeated urban use.

This sealed 3-speed internal gear hub is suitable for shared city bicycles, commuter e-bikes, utility bicycles and OEM urban mobility projects that require stable manual shifting and sealed rear hub protection. It is especially useful where the vehicle platform uses roller brake systems and needs practical access for assembly, maintenance and fleet servicing.

For riders, the manual gear range supports smoother starts, steady cruising and moderate climbing in everyday city use. For OEM brands and fleet operators, the sealed M03 hub structure helps reduce exposed drivetrain components while keeping the rear wheel layout simple, durable and suitable for repeated urban operation.

Before sampling or production, OEM customers should confirm frame O.L.D., rear fork structure, roller brake matching, chainline, spoke specification, shifter selection and installation space. The hub can be matched with LL-3S01E, LL-3S02E, LL-3S03E or LL-3S04E shifter options according to cockpit layout and cable routing requirements.

Q: What type of bicycle is this sealed 3-speed hub suitable for?

A: It is suitable for shared city bicycles, commuter e-bikes, utility bicycles and OEM urban mobility platforms using manual 3-speed rear hub systems.

Q: Is this an automatic gear hub?

A: No. It is a manual 3-speed internal gear hub. The rider changes gears through a matched shifter.

Q: Where can I check the detailed gear ratio data?

A: The detailed gear ratio data is listed in the Technical Parameters table for engineering confirmation.

Q: What brake type does this configuration support?

A: This configuration is designed for roller brake compatibility.

Q: Why is the outside-fork layout useful for shared bicycles?

A: The outside-fork control layout gives easier access for installation, adjustment and maintenance around the rear hub, which is helpful for fleet servicing.

Q: Which shifters can be matched?

A: The hub can be matched with LL-3S01E, LL-3S02E, LL-3S03E or LL-3S04E shifter options according to the vehicle cockpit and cable routing layout.

Q: What should be confirmed before OEM sampling?

A: Confirm frame O.L.D., brake type, shifter compatibility, chainline, spoke specification, rear fork structure and installation space before sampling or production.