Description
Elevate your bicycle’s drivetrain with the Gates Carbon Drive Belt Drive CDX Rear Cog, 9-Spline, 39T – the perfect blend of lightweight engineering, durability, and precision performance. Crafted from superlight machined aluminum, this rear cog features an interior guide flange for seamless belt engagement and optimal tracking, ensuring smooth, reliable power transfer on every ride.
Materials & Construction:
Made from high-grade machined aluminum, the Gates Carbon Drive CDX rear cog offers exceptional strength-to-weight ratio, reducing weight without compromising durability. Its corrosion-resistant finish guarantees longevity under diverse riding conditions, making it an ideal choice for both city commuting and rugged trail adventures.
Performance & Engineering:
Designed specifically for the Gates Carbon Drive belt system, this 39-tooth cog provides efficient gearing and smooth engagement, enhancing pedaling efficiency and cruising comfort. The precise 9-spline hub interface ensures a secure fit with standard belt drive hubs, facilitating easy installation and maintenance. Compatible with the Gates CDX belt, it’s engineered for optimal tension and power transfer, optimized through the Gates Carbon Drive app for perfect drivetrain setup.
Components & Technology:
Featuring innovative spline technology, this component ensures a precise fit and minimized wear over time. The 6-bolt attachment system allows for secure mounting on compatible hubs, delivering a clean aesthetic and reliable performance. The design incorporates advanced manufacturing techniques for consistent quality and performance.
Style & Use Case:
Whether upgrading your commuter bike, customizing a touring rig, or optimizing a performance mountain bike, the Gates CDX Rear Cog offers a sleek, modern look paired with dependable function. Its minimalist profile complements a variety of bike styles, making it a versatile choice for riders seeking a maintenance-free, sleek drivetrain solution.
Key Features:
– Superlight machined aluminum construction with guide flange for seamless belt engagement
– 39T gear ratio for balanced speed and torque
– Precise 9-spline hub interface for secure fit and easy installation
– Compatible with Gates Carbon Drive CDX belts for enhanced durability
– 6-bolt mounting for universal compatibility
– Optimized through drivetrain calculations via the Gates Carbon Drive app
Upgrade your belt drive system with confidence-choose the Gates Carbon Drive Belt Drive CDX Rear Cog, 9-Spline, 39T for a combination of lightweight performance, durability, and sleek style. For more information and drivetrain optimization tools, visit [gatescarbondrive.com](.) or download the Gates Carbon Drive iPhone app.
- Precision-machined aluminum construction ensures lightweight durability and long-lasting performance for your bicycle drivetrain.
- Designed with a 9-spline hub interface and 6-bolt compatibility, offering secure fitment and easy installation on a variety of bike frames.
- Features a 39-tooth gear size optimized for smooth, efficient power transfer, ideal for urban commuting, touring, and high-performance cycling.
- Incorporates advanced engineering with an interior guide flange to enhance chain engagement and reduce slip, maximizing drivetrain efficiency.
- Compatible with Gates Carbon Drive Belt systems, and supported by the Gates Drive app for tension analysis and drivetrain calculations, ensuring optimal performance.
| Hub Type | 9-Spline 6-Bolt |
| Teeth | 39t |
| Model Name | CT1139SMN |






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