Koova is proud to introduce the S Series hubs, a new generation of precision MTB hubs developed over seven years of engineering, testing, and real-world riding feedback.
Designed to meet the demands of modern mountain biking, the S Series focuses on efficient power transfer, mechanical stability, and long-term durability—the three pillars of a high-performance bike hub.
Whether you’re building a trail bike, enduro machine, or performance-focused wheelset, the S Series is engineered to deliver consistent and reliable engagement in every ride.
What Makes the Koova S Series Different?
At the heart of the S Series is Koova’s planetary ratchet system, a design created to improve engagement efficiency, reduce power loss, and enhance mechanical stability under load.
This system represents a major step forward compared to traditional pawl-based MTB hubs.
1. Planetary Ratchet System with Angled End Teeth
The S Series hubs are built around a planetary-style ratchet structure, designed to distribute force more evenly across the engagement surface.
Key advantages of the planetary ratchet design:
- Angled end teeth can improve meshing stability
- Smoother torque transfer under heavy pedaling
- Improved load distribution compared to traditional pawl systems
This results in a hub that feels more direct, more controlled, and more predictable, especially when climbing or accelerating on technical terrain.
2. Premium Materials & Precision Manufacturing
Every Koova S Series hub is produced through a multi-stage precision manufacturing process, ensuring consistent quality and tight tolerances.
Materials Used
- Hub shell: Forged and CNC-machined 6061 aluminum
- Axle: Precision-ground steel shaft
- Ratchet teeth: Hardened steel alloy with specialized surface treatment
The choice of materials ensures that the S series is a true precision MTB hub.
3. Sealed, Waterproof, Trail-Ready Design
Mountain biking means exposure to mud, dust, rain, and pressure washing.
The S Series continues Koova’s commitment to durability with:
- Multi-layer sealing structure
- Dustproof and waterproof protection
- Stable performance in wet and muddy conditions
From XC to enduro riding, the S Series hubs are built to keep spinning smoothly when conditions get tough.
4. Designed for Easy Bike Hub Service & Maintenance
Unlike many high-performance hubs that require complex servicing, the S Series emphasizes user-friendly maintenance.
- The drive-side bearing can be directly removed without disassembling the 75T ratchet, making it easier to clean or replace the bearing.
- The hub-side ratchet components can be removed with a dedicated tool.
- Reduced downtime for riders and bike shops.
This makes the S Series ideal not only for riders, but also for professional bike hub service environments.
5. Clear Product Structure: S Series Explained
Koova designed the S Series to be easy to understand and scalable across disciplines.
Model Naming Logic
- S-prefix models → Designed for mountain biking
- G-prefix models → Optimized for road cycling
- Numerical codes → Identify shell structure,and performance focus
Example: S10 Hub
- General-purpose MTB hub
- Planetary ratchet with angled end teeth
- Balanced performance for trail and enduro riding
This structure allows riders, and bike shops to quickly identify the correct MTB hub configuration for their needs.
Why Riders Choose Koova S Series MTB Hubs
- ✔ Efficient planetary ratchet engagement
- ✔ Stable torque transfer under load
- ✔ Precision-machined aluminum construction
- ✔ Easy maintenance and servicing
- ✔ Designed for modern MTB standards
If you’re looking for an MTB hub that balances performance, durability, and serviceability, the S Series is engineered to be a reliable foundation for your wheelset.
Learn More About Koova Hubs
Koova supplies MTB hubs for riders, bike shops, and partners worldwide.
👉 Explore the Koova S Series MTB Hubs
If you have questions about compatibility, hub standards, or choosing the right configuration, our team is always ready to help.