Bike Hub Engagement Explained: Pawl vs Ratchet Systems
When choosing a mountain bike hub, riders often pay attention to weight, engagement angle, or the sound of the freehub.
However, the most important part of a hub is how it transfers power from your pedals to the rear wheel.
This is determined by the hub engagement system.
Modern Bike hubs mainly use two different designs:
Pawl systems and ratchet systems.
Both approaches have been developed over many years, and each has its own advantages. Pawl systems focus on simplicity and fast response, while ratchet systems focus on larger contact areas and high-load durability.
Understanding the difference helps riders choose the right hub for their riding style.
Pawl Systems: Simple, Lightweight, and Proven
Pawl systems are one of the most common engagement designs used in bicycle hubs.
A traditional pawl hub uses several spring-loaded pawls that lock into a toothed ratchet ring when the rider pedals. The force from the drivetrain is transferred through these contact points to drive the rear wheel.
The advantages of pawl systems are clear:
- Simple structure
- Low weight
- Easy maintenance
- Proven reliability
This is why pawl designs have remained popular for decades.
However, the design also has limitations.
Because power is transferred through several small contact points, the load is concentrated on the pawls and the engagement surfaces. Under high torque situations, such as aggressive climbing, sprinting, or technical riding, these areas experience significant stress.
The Evolution of Pawl Systems: Faster Engagement
To improve riding response, manufacturers began increasing the number of engagement points.
By adding more pawls or using multi-tooth pawl designs, the hub can reduce the rotation needed before power is transferred.
Classic six-pawl designs, such as those used by Hope, represent a reliable balance between durability and performance.
Other designs, such as Industry Nine’s high-engagement hubs, push this concept further by using a very high number of engagement points to achieve extremely fast response.
However, the smallest engagement angle is not always the only goal.
For full-suspension mountain bikes, drivetrain feedback during suspension movement can also affect the riding experience. Some manufacturers, such as e*thirteen, developed solutions that focus on reducing pedal kickback and improving the balance between pedaling efficiency and suspension performance.
This shows that hub design is not simply about achieving the highest engagement number. It is about finding the right balance.
Ratchet Systems: Larger Contact Area, Higher Torque Capacity
The second major approach is the ratchet system.
Unlike pawl designs, ratchet hubs use two toothed rings that engage directly with each other.
When the rider applies power, multiple teeth engage simultaneously, distributing the load across a much larger contact area.
This creates several advantages:
- Higher torque capacity
- Lower stress on individual components
- More consistent power transfer
- Excellent durability under demanding conditions
For aggressive MTB riding, where riders generate high torque during steep climbs, technical terrain, and hard accelerations, the larger contact area provides a strong and reliable connection.
Different Ratchet Designs, Same Engineering Goal
The basic principle of a ratchet system is simple: increase the contact area between the driving surfaces.
Different manufacturers have developed their own solutions based on this idea.
DT Swiss Star Ratchet is one of the most recognized examples, using a simple but highly effective design that has become known for reliability and durability.
Chris King developed the RingDrive system with a different approach, integrating the engagement mechanism deeper into the hub structure to improve durability and precision.
As Chris King says:
“A product is not worth making unless you make it better.”
This philosophy represents the pursuit of better engineering rather than simply adding more specifications.
KOOVA Planetary Ratchet: Designed for Strength and Efficiency
At KOOVA, we chose the ratchet system for the S10 hub because we believe a high-performance MTB hub needs both fast response and long-term reliability.
The koova S10 uses a 75T planetary ratchet system with a conical tooth profile.
The angled tooth design helps maintain a stable engagement position between the ratchet surfaces, improving power transfer efficiency while reducing unnecessary stress during high-load riding.
To further improve durability, the ratchet teeth receive multiple surface hardening treatments and advanced coating processes.
The goal is not simply to achieve a higher tooth count.
A great engagement system must also provide:
- Strength under high torque
- Reliable performance over time
- Consistent power transfer
Our philosophy is simple:
Build a hub that riders can trust every time they put power into the pedals.
Choosing the Right Engagement System
Pawl and ratchet systems represent two different engineering approaches.
Pawl systems offer simplicity, lightweight construction, and fast engagement possibilities.
Ratchet systems provide larger contact areas, higher torque capacity, and consistent power transfer.
There is no single perfect system for every rider.
The best hub is the one that matches your riding style, terrain, and performance needs.
Behind every click of a freehub is years of engineering development — all focused on one goal:
Transferring your power to the trail with confidence.