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High Precision 7-Speed Bicycle Gear for Bicycle Transmission Part
7-speed bicycle gears are transmission gear sets specially designed for 7-speed variable-speed bicycles, including flywheels, chainrings, chains and shifting positioning gears. Made of high-strength lightweight alloy materials through precision stamping, cutting and heat treatment, they support 7-speed gear ratio switching to adapt to flat roads, climbing, acceleration and other riding scenarios, serving as core components for labor-saving, speed-up and complex road condition adaptation in bicycle transmission systems.
Product Features
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.
Technical Parameter Table
Speed
7-Speed
Freewheel Teeth
14T ~ 28T
Chainring Teeth
24T / 32T / 42T
Module
1.0 ~ 1.5
Accuracy Grade
ISO 8 ~ 10
Material
Carbon Steel / Alloy Steel / Aluminum Alloy
Heat Treatment
Quenching / Tempering / Carburizing
Surface Hardness
HRC 40 ~ 52
Transmission Efficiency
≥95%
Main Applications
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
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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Seller
Year Established:
1994
Total Annual:
70 million-100 million
Employee Number:
50~60
Ecer Certification：
Verified Supplier
Our company was formerly known as Changsha Double Star Gear Industrial Co., Ltd, which was established in 1994. It is a directly affiliated university-run enterprise founded by Central South University Professor Zeng Tao, the leading expert on spiral bevel gears in China. It was later renamed as Cha... Our company was formerly known as Changsha Double Star Gear Industrial Co., Ltd, which was established in 1994. It is a directly affiliated university-run enterprise founded by Central South University Professor Zeng Tao, the leading expert on spiral bevel gears in China. It was later renamed as Cha...
