How Does a Hubless Motorcycle Wheel Work?

The world of motorcycle design has seen incredible innovations over the years, from electric bikes to advanced suspension systems, but one of the most futuristic concepts is the hubless motorcycle wheel. Imagine a motorcycle with wheels that appear to float without any visible hub or axle—a design that seems more at home in a science fiction movie than on the roads. However, this “hubless” design is a reality, and it’s a testament to the cutting-edge technology in the automotive industry.

In this article, we’ll explore how a hubless motorcycle wheel works, the mechanics behind it, and the practical implications for riders. Whether you’re a motorcycle enthusiast or someone simply curious about futuristic tech, this article will break down the concept and examine its benefits and drawbacks in an easily understandable way.

What Is a Hubless Motorcycle Wheel?

A hubless motorcycle wheel, also known as a centerless wheel, is a wheel design that doesn’t use the traditional central hub, which is typically found in most motorcycle wheels. Instead, this system uses a more unconventional approach to connect the wheel to the motorcycle frame and provide support. This gives the motorcycle a sleek, futuristic look while also improving some aspects of its performance, like handling and weight distribution.

Key Features of Hubless Motorcycle Wheels:

No Central Hub: Unlike traditional wheels that use a central hub to connect the wheel to the axle, the hubless design eliminates this hub.
Framework: The hubless wheel relies on a strong, circular framework inside the wheel that holds it in place and allows it to rotate freely.
External Bearings: The bearings in a hubless wheel are placed around the circumference of the wheel, providing support and stability while enabling the wheel to turn.

How Does a Hubless Motorcycle Wheel Work?

At first glance, it may seem like a hubless wheel would be unstable or impractical, but this unique design relies on advanced engineering principles to function effectively. Let’s break down how it works:

1. Structural Framework

Instead of the conventional hub, a star-shaped or circular framework is built inside the wheel. This framework distributes the forces exerted by the motorcycle’s movement across the entire wheel, providing the necessary support and strength to bear the weight of the motorcycle. The framework is often made from materials like steel, aluminum, or carbon fiber, which are known for their high strength-to-weight ratio.

2. Bearings

The key to the hubless design is the use of bearings placed at the center of the wheel. These bearings are crucial for allowing the wheel to rotate smoothly without the traditional axle system. The two sets of bearings work together, with the inner bearing connected to the frame and the outer bearing connecting to the tire, ensuring both stability and motion.

Internal Bearing: This bearing connects the wheel to the motorcycle’s frame. It provides support and helps keep the wheel in place while allowing it to rotate.
External Bearing: This bearing holds the tire in place and is integrated into the wheel. It helps with steering and braking, as the wheel is designed to handle the forces generated by these functions.

3. Brake System

In a hubless motorcycle, braking is achieved through the integration of a brake ring that is built into the wheel’s external bearing. This design helps reduce the complexity of the braking system and makes the wheel appear even more minimalist.

The brake ring surrounds the wheel’s circumference, allowing the brakes to work by creating friction between the brake pads and the brake ring. This offers an efficient and sleek way of stopping the motorcycle without requiring a bulky central brake mechanism.

4. Weight Distribution and Handling

One of the notable advantages of a hubless wheel is its ability to lower the unsprung weight of the motorcycle. Unsprung weight refers to the parts of the motorcycle that are not supported by the suspension, such as the wheels and tires. By reducing this weight, the motorcycle’s suspension system has an easier job of keeping the bike stable and improving handling.

Improved Steering and Suspension: With less weight to manage, the motorcycle’s steering becomes more responsive, and the suspension can more easily absorb bumps and vibrations.
Better Ride Quality: Reducing unsprung weight allows for a smoother ride, especially on rough roads or uneven surfaces.

Examples of Hubless Motorcycles

While hubless motorcycles may still be a niche concept in the motorcycle industry, there are a few prominent examples of bikes that have incorporated this innovative wheel design.

1. Ballistic Cycles Hubless Bagger

One of the most well-known motorcycles with a hubless wheel is the Ballistic Cycles Hubless Bagger. This motorcycle features a large 30-inch front wheel that gives it a unique aesthetic and futuristic appearance. Some key highlights of this model include:

Custom-Made Wheels: The 30-inch front wheel is crafted from a solid chunk of billet and is fully customized to give the bike a one-of-a-kind look.
Integrated Braking System: The wheel’s design incorporates a braking system that is integrated into the wheel itself, offering a minimalist and clean look.
Stylish and Functional: The hubless design not only enhances the motorcycle’s appearance but also provides a functional advantage, especially when it comes to handling and performance.

2. TMC Dumont

The TMC Dumont is another example of a hubless motorcycle, known for its massive 36-inch wheels. The bike was designed to showcase the future of motorcycle technology, combining advanced engineering with an innovative aesthetic. Some unique aspects of the Dumont include:

Futuristic Design: The large wheels and sleek frame give the TMC Dumont a sci-fi vibe, making it a standout piece in the world of custom motorcycles.
Performance Trade-offs: While the bike looks impressive, the size of the wheels can make it more susceptible to damage from road debris and potholes. This puts a strain on the bearings and the overall durability of the bike.
Enhanced Handling: Despite these challenges, the reduced unsprung weight improves the bike’s handling, steering, and braking capabilities.

3. Verge TS Hubless Superbike

The Verge TS is perhaps one of the most exciting developments in the hubless motorcycle world. This electric superbike features a hubless rear wheel system powered by a centerless hub motor. Here are some details:

Electric Motor: The Verge TS uses an electric motor that is integrated into the rear wheel, generating 80 kW of power and 738 lb-ft of torque.
Acceleration: The bike can accelerate from 0 to 62 mph in just under four seconds, showcasing impressive speed and performance.
Eco-Friendly: Being an electric motorcycle, the Verge TS offers an eco-friendly alternative to traditional gas-powered motorcycles, making it a green option for environmentally conscious riders.