After two races covering roughly 2,400 kilometres in total, my most important lesson is an uncomfortable one for every bike scale:

The fastest ultra bike is not necessarily the lightest bike. It is the bike on which you can still produce power after 30 hours.

For the Tour Gravel Vosgien and the Italy Divide, I chose an unusual setup: a full-suspension mountain bike frame with drop bars, aerobars, wide mountain bike tyres and electronic shifting. Call it a drop-bar MTB, a monster gravel bike or simply a bike that confuses Instagram. At three in the morning during a 1,200-kilometre race, the category no longer matters to me.

What matters is whether I can continue riding with power, control and as little unnecessary fatigue as possible.

Comfort is not a luxury

Bike weight is easy to measure in a shop. Comfort only reveals its value after twenty, thirty or forty hours.

A light gravel bike can feel fantastic on the first climb. But an ultra-distance race is not decided during the first two hours. The important question is how much power my body can still produce after an entire day - and how often I have to stop because of my hands, neck, back or general fatigue.

Full suspension does not remove every impact, and it certainly does not turn the bike into a mobile wellness hotel. It does, however, reduce the effect of thousands of small hits. I can sit more comfortably, pedal more consistently over rough terrain and spend less energy holding the bike under control.

For me, suspension is therefore not simply about comfort. It is fatigue management.

If a lighter bike causes my performance to drop more sharply after 30 hours, it is no longer the faster bike over the complete race.

Why I want at least 50 mm of tyre clearance

My second lesson is simple: high-volume tyres are incredibly valuable during rough ultra races.

For this kind of event, I want my next frame to accept tyres of at least 50 mm. If the route and frame allow it, approximately 57 mm or 2.25 inches is even better for my needs.

This does not contradict my positive experience with the Continental Terra Competition 45. That tyre performed very well. The quality of a specific 45 mm tyre and the maximum clearance I want from a future ultra bike are two different questions.

More volume gives me a larger operating window for pressure, traction and line choice. On rough ground, I do not have to search desperately for the perfect line. The tyres absorb more of the trail and make small mistakes less costly - an increasingly important advantage when fatigue slows down my reactions.

Tyre clearance is not about squeezing the widest possible tyre into a frame. The actual tyre width, rim, tread and the safety clearance specified by the manufacturer all have to work together. But a frame that ends at 45 mm limits my options for future races.

Wide tyres and aerodynamics can work together

A full-suspension bike with mountain bike tyres does not make aerodynamics irrelevant.

On flat roads, fast gravel and into a headwind, a low and stable position remains extremely valuable. That is why aerobars are essential for my long-distance setup. They make me faster on suitable sections, but their second benefit may be even more important: they give me another riding position.

I can take pressure off my hands, support my upper body differently and distribute the load across more contact points. This combination is what makes the bike work for me: comfort and control underneath, with an aerodynamic position above.

Of course, I only use the aerobars when the surface, visibility, traffic and route make it safe. Aero can provide almost free speed. It does not provide free safety.

Electronic shifting after many hours

Electronic shifting is another feature I would not want to give up on an ultra bike.

After many hours, a clean button press is simply pleasant. Shifts remain precise even when my hands are tired. It is not essential, but it is a luxury that I genuinely appreciate during a long race.

In my use, one battery lasts approximately 700 to 800 kilometres. I therefore carry one spare for a 1,200-kilometre race. The spare stays dry and easy to reach. A battery buried underneath a sleeping bag, jacket and half the contents of the bike may technically be present, but it is not practically available.

The 700-to-800-kilometre range is my personal experience, not a general promise. Battery life varies with the system, temperature and shifting behaviour.

The advantage that does not appear on a specification sheet

One of the most important qualities of an ultra bike is difficult to express in numbers: tolerance for mistakes.

On the second day, not every line choice is brilliant. Reactions become slower, the body becomes less relaxed and the brain eventually starts operating like a bike computer in energy-saving mode.

Wide tyres and suspension give me more control and reserve. This is not only about descending faster. It means less tension, less unnecessary braking and fewer small errors.

The best ultra bike should not only perform when the rider is fresh. It must remain predictable when the rider is no longer particularly fresh.

Total speed matters more than riding speed

This is why I do not look only at the speed displayed while the bike is moving.

For an ultra, the real calculation is:

Distance divided by total elapsed time.

That includes stops, eating, stretching tired hands and the five minutes spent searching for an energy bar that has been in the same bag all day.

If a heavier setup costs me a little speed while riding but reduces my performance drop and the number or length of my stops, it can still be faster overall. That is the calculation missing from the bike scale.

The biggest weakness of my Pivot: storage

The bike is not perfect. Its clearest weakness as an ultra setup is the limited usable storage space inside the frame.

On a full-suspension bike, the shock, bottles and luggage compete for the same space. The front triangle on my Pivot is not ideal for an ultra-distance setup, although some newer frames solve this problem better.

I can make a backpack and hydration bladder work, but that is a solution to the problem rather than the most elegant design. Next year, I plan to move my sleep system onto a lightweight Tailfin rack. The goal is not to carry more equipment. It is to distribute the same equipment more effectively and make it easier to reach.

This is a plan for the next version of the setup, not yet a long-term review of that rack solution.

The bike has solved my riding problem. It has not completely solved my luggage problem.

A full-suspension drop-bar bike is not always the answer

Would I choose this kind of bike for every event? No.

On smooth gravel, during a shorter race or on a genuinely fast and non-technical course, a lighter rigid gravel bike may be the smarter choice. Full suspension adds weight, bearings, a shock, setup work and more components that require maintenance. A poor suspension setup can even cancel out much of the benefit.

If the route barely challenges the suspension, you may simply be carrying it around.

For long, rough and mixed-terrain races, however, the calculation changes for me. Tyre clearance, multiple hand positions, control and the way the bike feels after an entire day become more important than its category or the number on the scale.

I therefore choose the bike around the demands of the route - and only then decide what category it belongs to.

My verdict after 2,400 race kilometres

I do not want the lightest bike in the car park. I want the bike that is still fast at the second sunrise.

For long and rough ultras, my drop-bar full-suspension bike works because it combines wide tyres, aerobars, electronic shifting and enough comfort to keep me moving consistently. Its biggest remaining weakness is storage, and that is where I plan to change the setup next.

What would you choose for 1,200 kilometres: a lighter gravel bike or a heavier full-suspension bike? And what tyre width is your sweet spot?

You can also read my Tour Gravel Vosgien race report and see the setup I used before the race.