Jiankun positive and negative tooth optical disc
Release Time：
2026-04-05
Source：
Jiankun positive and negative tooth optical disc
Positive-and-negative teeth and conventional (traditional) teeth are the two core tooth-profile designs for bicycle chainrings, with the key difference lying in tooth thickness and engagement geometry—factors that directly determine the stability and efficiency of single-chainring systems.
I. Key Structural Differences
1. Standard gears (traditional transmission gears)
Structure : Tooth profile Exact consistency in thickness, height, and width . To facilitate chain-based gear shifting, the tooth tips will be Shorten and bevel 。
Principle : Only with the chain Internal link section Occlusion, External Link Section In a suspended state with a large gap.
Uses : for Multi-disc (2X/3X) variable-speed system Design, reliance Front derailleur Prevent chain drop.
2. Positive and Negative Teeth
Structure : Straight teeth and Negative tooth Alternating arrangement 。
Principle: The positive teeth precisely engage the outer links of the chain, while the negative teeth fit into the inner links, ensuring tight meshing across the entire pitch.
Application: Specifically designed for single-chainring (1X) systems, it prevents chain drop without the need for a front derailleur.
II. Comparison of Core Advantages
1. Anti-drop chain capability (the core advantage)
- Standard tooth : When a single disc is used, the lateral clearance of the chain is large. Very easy to lose the chain , must rely on the front derailleur or chain guide.
- Positive and negative teeth : Positive and negative teeth, just like a mortise-and-tenon joint. Lock down Chain, Significantly suppress lateral sway , it is also unlikely to come loose during severe turbulence or when jumping and landing.
2. Power Transmission Efficiency
Standard tooth : Large meshing clearance, easily causing Virtual position, skipped tooth , power interruption and inconsistent force application.
Positive and negative teeth : Large meshing area and tight fit, Zero backlash in power transmission , the stepping is more direct and uniform, with efficiency improved by approximately 18%。
3. Structure and Maintenance
Standard tooth : Multi-disc systems have a complex architecture (front derailleur, cable housing), are heavy, and require tedious maintenance.
Positive and negative teeth ： Single-disk minimalist structure ， Weight loss (1–2 fewer chainrings, no front derailleur), Low failure rate , more resistant to mud and dirt.
4. Service Life
Standard tooth : Thin teeth and uneven stress distribution, Prone to wear and chipping 。
Positive and negative teeth : The straight teeth are thicker and more wear-resistant, Longer lifespan 。
III. Summary of Applicable Scenarios
Select standard teeth ：
Still in use 2-chainring / 3-chainring , needs Front derailleur of the traditional model.
to Wide gear ratio There is extremely high demand (e.g., for long-distance mixed-road conditions).
Select positive and negative teeth ：
Mountain Bikes (XC/AM/Enduro) 、 Gravel (gravel bike) 、 Single-speed bikes, folding bikes, and children’s bikes 。
Pursuit Lightweight, concise, and highly stable ， Intense off-roading, maintenance-free 。
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Shenzhen Jiankun Sporting Goods Co., Ltd.
No. 10, Zhenxing Road, Liyuhe Industrial Zone,
Gongminglou Village, Shenzhen
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