7-Speed Bicycle Internal Hub Planetary Gear Set for Smooth Gear Shifting Transmission

• 7-speed gear ratio design, suitable for flat roads, uphill, downhill and other road conditions.
• Lightweight and high-strength structure, no extra body weight with sufficient rigidity.
• Smooth and accurate shifting, fast response, no chain skipping or jamming.
• Wear-resistant and corrosion-resistant tooth surface with strong rust prevention for long-term outdoor use.
• Compact structure, compatible with mainstream bicycle hub and bottom bracket installation standards.
• Strong compatibility, matching most brands of 7-speed derailleurs and shifters.
• Stable operation with low noise, providing smooth and comfortable riding experience.

• Transmission systems for 7-speed mountain bikes and city commuter bikes.
• Gears for student bikes, leisure scooters and folding bicycles.
• Auxiliary transmission for road leisure bikes, touring bikes and light electric bikes.
• Maintenance, upgrade and replacement of original 7-speed gear sets.
• Shifting components for shared bikes and shared e-bikes.
• Supporting production for various mid-to-low end complete bicycles.

Product Advantages

• Wide coverage of 7-speed gears, easily adapting to city, rural and sloped roads.
• Accurate and smooth shifting, no chain skip or slip, high reliability.
• Lightweight design with high strength, more labor-saving riding.
• Wear-resistant and rustproof, long service life, adapting to outdoor weather.
• High universality, easy installation, directly replaceable for most brand parts.
• Moderate cost with high cost-performance, suitable for mass market.
• Stable and low-noise operation, improving overall riding comfort.

Production Process

• Raw Material Inspection → 2. Precision Stamping/Forging Blanks → 3. CNC Turning
• Gear Hobbing/Milling → 5. Heat Treatment Strengthening → 6. Sandblasting/Shot Peening
• Surface Anti-rust Treatment (Galvanizing / Blackening / Anodizing)
• Accuracy & Dynamic Balance Testing → 9. Assembly Grouping → 10. Packaging & Warehousing

Operation Method

• Calibrate derailleur limit screws during installation to ensure smooth and non-deviating chain shifting.
• Shift gradually via shifters while riding, avoid forced shifting when stationary.
• Downshift before uphill to reduce pedaling load and protect gears.
• Use medium-high speed gears on flat roads to improve riding efficiency.
• Regularly clean mud, sand and oil on gears, flywheels and chains.
• Apply special lubricant regularly to ensure smooth shifting.
• Check chain tension and gear wear, adjust timely.

Why Choose us?

• 7-axis CNC Grinding: Tolerances as tight as ±5μm for quiet, durable operation.
• Strong technical expertise: Doctoral and master’s professionals in spiral bevel gear technology.
• Custom Design: Solutions for high-reduction, high-speed, heavy-load, and low-noise and less teeth for users
• Rigorous Testing: 100% inspection via Gleason metrology systems.