In the history of American motorcycling, Erik Buell is the ultimate disruptor. A former Harley-Davidson engineer with a racer’s soul, Buell didn't just want to build motorcycles; he wanted to reinvent the way they handled. His 'Trilogy of Tech' chassis rigidity, low unsprung weight, and mass centralization led to some of the most idiosyncratic machines to ever hit the asphalt. From the fuel-in-frame XB series to the perimeter-braked 1125, a Buell is a mechanical enigma that defies convention.

But while the factory focused on streetfighters and sport-tourers, the custom world quickly realized that the Buell's torquey V-twin and compact dimensions made it the perfect foundation for a flat tracker. When you take that massive American grunt and pair it with a dirt-track stance, you get a machine that is as brutal as it is agile. Whether they are purpose-built Hooligan racers or street-legal trackers, these five builds represent the best of the breed. Here are five of our favorite Buell trackers featured on Bike EXIF.

When a race engineer decides to build a tracker, the results are bound to be surgical. David Sánchez of Bottpower spends his days on the European Superbike circuit, and he poured every ounce of that data-driven expertise into the XR1R. Built on the Buell XB platform, this 'laboratory bike' was designed to be the ultimate supermoto-tracker hybrid, a machine that feels as comfortable on a twisty circuit as it does on a dirt oval.

The XR1R forsakes the heavy stock twin-spar frame for a prototype titanium backbone design that uses the 1203cc Thunderstorm engine as a stressed member. Because the fuel-carrying frame is gone, Sánchez engineered a three-reservoir system, including a carbon fiber cell up top and two smaller tanks tucked down low. This isn't just for show; the bike is equipped with a full data acquisition system to measure frame stress via extensometry gauges, tech usually reserved for MotoGP paddocks.

The Buell Blast is often remembered as a punchline, a beginner bike so unloved that Erik Buell famously crushed one to signal its demise. But for Toshiyuki ‘Cheetah’ Osawa, the Blast’s single-cylinder 'half-a-Sportster' engine was a rare and tempting canvas. Cheetah, the mastermind behind Japan’s ‘Have Fun’ flat track series, wanted to create something unprecedented: a legitimate racer that captured the lean, molded spirit of a 70s chopper.

Cheetah didn't just modify the Blast; he performed a total frame rebuild, fabricating a bespoke chromoly chassis from the ground up. The front half of the bike features a monocoque tank and backbone that uses traditional chopper molding to create a seamless, liquid form. This is contrasted sharply by the rear section, where Cheetah utilized bronze brazing, a traditional technique he taught himself, to join the chromoly tubes of the subframe and the X-gussested swingarm.

The bike rolls on 19-inch Sun Rims shod with Hoosier dirt track rubber, suspended by high-end WP components. Every detail, from the engine turned finish on the handmade oil tank to the Dell’Orto carb and Ixil muffler, screams craftsmanship. By blending the aesthetic of a vintage dragster with the geometry of a modern flat tracker, Cheetah turned one of motorcycling’s greatest failures into a breathtaking success. [MORE]

Richard Pollock, better known as Mule, is the undisputed king of the street tracker. When the American Grand National Hooligan Championship rose to prominence, Mule decided to build the 'ultimate class-legal bike.' He started with a Buell X-1 Lightning, choosing it because the frame is 10 lbs. lighter than a Sportster unit and features a removable subframe, perfect for a builder looking to smash minimum weight requirements.

Mule rigid-mounted the motor and fabricated a custom chromoly swingarm and subframe. The engine is a 1,203cc masterpiece of performance and reliability, featuring Dark Horse Crankworks rods, Branch & O'Keefe head mods, and Red Shift cams. To save even more weight and improve ground clearance, Mule installed a two-speed transmission and a Barnett Scorpion clutch, shaving an additional 12 lbs off the build.

The bodywork is as minimalist as it gets: a wafer-thin aluminum fuel tank holding just 1.3 gallons, enough for a furious Hooligan heat race. Mule even used a wire EDM cutter to 'cut and shut' the primary cover, rotating it 45 degrees to keep the clutch cable out of the dirt during a lowside. It’s a no-nonsense, high-performance tool built by a man who understands exactly what it takes to turn left and go fast. [MORE]

While the XR1R is a track weapon, this build in the Bottpower series focuses on 'experiential motorcycling' for the street. Based on the XB12, it utilizes Bottpower’s signature backbone frame and stressed-member engine configuration. However, this particular client wanted to deviate from the standard flat-track look, requesting a headlight from German designer Jens vom Brauck (JvB-moto).

The addition of the JvB-moto headlight completely shifts the bike's personality, blending Bottpower’s technical racing heritage with a 'neoclassic' cafe-tracker vibe. The bike features a three-stage fuel cell system tucked under a carbon fiber tank cover, handmade titanium collectors, and a Torque Hammer exhaust. It’s a mechanical symphony of carbon, titanium, and magnesium that produces a soundtrack only a high-compression American V-twin can provide.

The Buell Ulysses XB12X was originally a quirky, hulking adventure-tourer, but Filippo and Giacomo Tagliabue of FTG Moto saw the potential for a menacing street tracker. Their client, a professor "who actually crunches real miles", wanted the comfort and long wheelbase of the Ulysses but the stripped-down soul of a tracker. The result is ‘Ithaca,’ a bike that looks like it was cut from a solid block of aluminum.

The bodywork is the star of the show, featuring a hand-formed aluminum airbox cover with a massive K&N filter peeking through. The subframe was deleted in favor of a boxed aluminum tail unit that bolts directly to the main frame. In a clever bit of engineering, the suede seat is mounted on a hydraulic piston that lifts at the touch of a button to reveal the battery and storage, locking firmly in place when closed.

FTG didn't stop at the bodywork; they machined their own yokes and headlight housings, fitting them with vertical LED turn signals and Highsider projectors. While the suspension and wheels remain stock for reliability, the addition of Pirelli MT60RS rubber and a Termignoni exhaust gives the bike a rugged, go-anywhere stance. It’s a refined, brushed-aluminum brute that proves even the bulkiest Buells can be taught to dance. [MORE]