Classic Meets Off-Road: Triumph T100 Bonneville “Sigma”

A Hybrid-Style Triumph from Tamarit Motorcycles… 

The Triumph Bonneville T100 combines the retro style and character of the 1200cc T120 with the lighter weight and quicker-revving engine of the 900cc Street Twin. As the old saying goes, “there’s no replacement for displacement,” but many riders and reviewers have found they actually prefer the T100 to its larger sibling:

“The Triumph Bonneville T100 has all the relaxed nature of the larger T120, but in a smaller, lighter and arguably more fun and engaging package…  –MCN

When it comes to customizing Triumph’s modern classics, few workshops boast the prestige and pedigree of Spain’s Tamarit Motorcycles, who’ve built more than 150 modern Triumph customs, and no two of them exactly alike. They’re a workshop who know that to keep growing, whether you’re an artist, athlete, or builder, you’ve got to continue pushing your boundaries into new territory…and they continue to do so.

So it is with their 138th build, nicknamed “Sigma” — a bike that seeks to harmonize two styles into a single visionary machine:

“Sigma is a word used in psychology to describe the personality of those who don’t need validation from others to be happy. In the context of statistics, it is used to refer to outliers, something out of the ordinary. And that’s a bit like the 138 project, an atypical Bonneville T100 where off-road and classic concepts blend together.”

The result is one of the most striking Triumphs we’ve ever seen, a bike that manages to bring together the class and mystique of a post-WWII Bonneville bobber with the burly aggression of a Great Escape-inspired scrambler, suffused with modern amenities like Motogadget electronics, LED lighting, smartphone integration, and high-level chrome and nickel finishes.

It’s a bike that would look just right parked next to a Supermarine Spitfire or Aston Martin DB6 — utterly timeless designs. Below, the Tamarit team gives us the full story on this 138th build.

In the Builder’s Words…

Ready for the real world, no matter the terrain, without losing an ounce of its classic elegance. The iconic Bonneville T100 has been used as the foundation for this project, and thanks to its versatility, it has become the star of this new hybrid-style motorcycle. A style that blends classic concepts with urban and off-road touches.

Design and painting have a special significance in two parts of the motorcycle, the fuel tank and the lenticular wheel, both pieces share a pattern and colors. This continuity in design and its horizontal lines seeks to convey a sense of speed, but the golden lines that separate the green from the white keep it within that classic aesthetic. The front fender has also been painted in green, just like the rest of the pieces.

Providing continuity in the design, the front part of the seat has been embedded in the tank. This way, the lines of both parts merge and come together for a smoother design. To achieve this result, the tank is carefully carved by hand to later fit the seat into that cavity.

The 138 project has included a highly valuable component, the lenticular wheel. These prevent air from penetrating through the spokes, thereby reducing turbulence and improving stability during driving.

In addition to its main function, the lenticular wheel also contributes significantly to the aesthetics of the motorcycle. In this case, it has been painted with the same design found on the motorcycle’s fuel tank.

138 Sigma features a handmade, custom-fit high exhaust specially-designed for the project. It offers an enhanced sound and an off-road aesthetic, combined with chrome finishing.

Another handmade element is the protective grilles for the mufflers, whose main purpose is to shield the rider from the exhaust heat.

In this project, a chrome plating process has been carried out on parts such as the forks, shock absorber, and the engine. It is a chemical process that leaves the parts of our motorcycles shiny like a mirror. Chrome-plating, nickel-plating, or brass-plating a part requires hundreds of hours of manual and artisanal work. This process sets us apart and positions us as a premium motorcycle brand.

That distinctive “gap” you see where the original wiring used to be is the result of the relocation of the electronics, now housed in a custom-made metal box. This creates a more aesthetic and minimalist visual sensation.

One of our essentials, the Motogadget odometer, has been included for a cleaner and more minimalist finish. It is also worth noting the incorporation of other Motogadget components, such as the front and rear turn signals, ECU, and proximity key support.

At Tamarit, we always seek the best optimization of the electronics in our motorcycles, and ECUs function as the brain of the motorcycles. That’s why we include the most complete Motogadget ECU on the market in our projects. Thanks to its functions and the app, the motorcycle can be fully monitored through your smartphone.

On the front area of the 138 motorcycle, you’ll see a new LED headlight and a chrome headlight grille. Additionally, we have also included a numerically-controlled machined triple tree and our Pantera springs, both chromed as well.

In the Sigma cockpit, a new handlebar has been installed along with control switches, Kustom Tech levers, Motogadget turn signals, and new mirrors.

This motorcycle also features K&N filters that enhance performance by increasing air supply to the engine and reducing temperature.

Like the rest of our projects, 138 Sigma includes engine emblems, this time with a relief-machined silver finish and a black background.

Our “Hummer” sump guard has been installed underneath the motorcycle.

On the rear part of the bike, you can also see new Hagon Nitro shock absorbers and our chain cover.

Noteworthy is the integration of the taillight within the frame, right where the seat ends.

Lastly, the license plate has been mounted with a side bracket, offering a cleaner appearance.

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