Bob: Four things lined up at once: material, process, performance, and a gap nobody had filled. Titanium is a compelling frame material. High strength, natural compliance, corrosion-resistant, with a fatigue life that outlasts carbon fibre by a wide margin. But traditional titanium construction can't deliver proper aero tube profiles. Butted tubing has physical limits. You can't sculpt the shapes CFD demands when you're working with tubes.

Metal additive manufacturing removes that constraint entirely. We can print a one-piece structure with topology-optimised internal geometry, aero profiles, and lattice reinforcement where it's needed, all in a single build. That was simply not possible with traditional construction.

And the market timing felt right. The carbon fibre road bike space is deeply saturated. Every brand is chasing the same formula, and the products are increasingly interchangeable. A growing number of serious riders are asking different questions: Can this be repaired? Will it hold its value? Can I still ride it in 15 years? Nobody was answering those questions with a proper performance bike.

Bob: There's always been a forced choice in high-end road bikes. Carbon gives you race performance, but it ages (always gets updated), it doesn't handle impact well, and when it's structurally compromised, it's done. Traditional titanium gives you longevity and a great ride feel, but the geometry is limited, and the aerodynamics are compromised. Early 3D-printed bike projects were mostly concept vehicles. They showed what was possible, but weren't refined, production-ready performance bikes.

The Aero One is the first bike that sits at the intersection of all three: aerodynamics, the durability of titanium, and the design freedom that metal 3D printing enables.

Bob: It is primarily a high-end long-term ownership product, though it carries elements of the others. It's not a pure race bike in the way a carbon performance bike is. Carbon fibre is still better suited to that specific goal.

What the Aero One offers is a bike you can ride at a high level for a decade or two, or three. One that can be repaired, customised to your geometry, and if you want, handed down. The technology is cutting-edge, visible in the design of the bike, but the end goal is always the riding experience and the long-term relationship between rider and frame.

Bob: Titanium has a very high strength-to-weight ratio, which is what makes this possible. A slender profile in titanium, especially with internal lattice reinforcement, can carry loads that would require a much larger cross-section in aluminium or steel. The goals were minimum frontal area, minimum weight, sufficient stiffness for high-intensity riding, and the visual language that comes with it.

For validation, we put the frame through FEA stress analysis, 100,000-cycle fatigue testing, static load and drop impact testing.

The vertical loading is rated to 150 kg, lateral: 80 kg. The entire frame is one piece with no brazed or welded junctions, which eliminates the weak points that concern people when they see a thin section.

Bob: That bidon-integrated approach optimises one variable: the down tube drag coefficient when a bottle is mounted. But it introduces compromises across the whole frame. You end up with a larger frontal area, more crosswind sensitivity, added weight, and a profile that only really makes sense with that specific bottle in that position.

Our CFD modelling focused on whole-bike drag across realistic riding speeds and yaw angles. At the speeds most high-end riders actually sustain, a slender down tube with a narrowly-widened cage section consistently delivers lower overall drag than the wide integrated approach, and it's significantly better in crosswind conditions. We made the minimum local intervention at the cage area. Everything else is optimised for the complete picture.

Bob: It was the central challenge of the whole project. Getting the three-way balance of lateral stiffness, aerodynamics, and weight right in that head tube junction is where the majority of the engineering time went.

The solution is internal. From the outside, the tube looks minimal, but internally the head tube zone uses a much higher-density titanium lattice structure, with more material exactly where the bending loads concentrate. The transition between head tube, top tube, and down tube is one continuous 3D-printed structure with no joints, so there's no localised stress concentration at the connections. FEA guided where material was added and removed throughout. We measured lateral stiffness against benchmark carbon aero frames, and it holds up.

Bob: We don't really benchmark against carbon. The cost structure is completely different, and so is what you're buying. Titanium powder costs multiples of carbon fibre per kilogram. Metal 3D printing equipment, heat treatment, and precision finishing all require significant capital. The engineering investment, CFD, FEA, topology optimisation, fatigue testing, and wind tunnel work is substantial for a first-generation product.

The more relevant comparison is the total cost of ownership over time. A carbon race bike is typically retired in three to five years. The Aero One is built to be ridden and maintained for 20 years. It can be repaired. It doesn't degrade the way carbon does under repeated impact and UV exposure. When viewed across that lifespan, the numbers look completely different.

Bob: Yes, and this is one of the most underappreciated aspects of titanium as a frame material. Titanium is weldable. Surface damage like scratches and minor dents can be polished out. Cracks or localised fractures can be laser-welded and heat-treated, with strength recovery. For more significant structural damage, localised sections can be reprinted and integrated.

Carbon fibre damage, delamination, impact fracture, and stress cracking are generally irreversible. Once the fibre matrix is compromised, you can't restore structural integrity. The frame is done. With titanium, damage is a repair job, not an endpoint.

Bob: We don't think faith is the right frame. We publish the engineering data: CFD results, fatigue test reports, weight figures, structural load data.

We're building test ride opportunities in key cities, because nothing substitutes for actually riding the bike. We're also working with third-party reviewers who'll evaluate it without a PR filter. And the warranty structure is part of it too.

Lifetime repair coverage is only possible because we're genuinely confident in the durability of the product. For riders who want a lower-stakes introduction, our titanium small parts let people experience the manufacturing quality and material before committing to a frame.

Bob: Any competitor can buy a metal 3D printer and titanium powder. The barrier isn't access to equipment.

The barrier is the knowledge, design and years of iteration.

The topology optimisation work, combining material behaviour, CFD aero requirements, and additive manufacturing constraints into a design that actually works for a bicycle, took years of trials.

Not just that, but the print parameter library: specific combinations of powder characteristics, build temperatures, print speeds, and post-processing curves that produce reliable, consistent parts.

To top it off, the whole-bike systems knowledge, how frame stiffness, aerodynamics, handling, and durability interact, only comes from actually building and testing complete bikes. 

You can copy the visual language of a design. You can't shortcut the engineering depth underneath it.

Bob: The immediate priority is a titanium wheelset, designed to work with the Aero One's aerodynamic package. After that, a fully integrated 3D-printed cockpit matched to the frame geometry rather than adapted from a third-party component.

Longer term, we want to offer custom geometry as standard. The whole point of additive manufacturing is that each frame doesn't cost significantly more to produce with different dimensions. That flexibility should translate into a real fit option for every rider, not just a frame that approximates your measurements.

Bob: It becomes the standard manufacturing process for high-end frames and components. The economics of the technology improve consistently: faster build speeds, lower cost per part, and broader material options. What requires significant capital investment today will be more accessible in a decade.

At that point, the conversation shifts from "why 3D printed?" to "why wouldn't you?" The traditional and additive approaches will coexist for a long time. Traditional manufacturing has its place in volume production. But for high-end bikes, I think 3D printing becomes the expected manufacturing method, not the exceptional one.