A masterpiece made of titanium.

Revival Cycles is showcasing big boxer engines with the Birdcage.

Alan Stulberg is a fan of boxer engines. He and his team have created a unique custom bike, living out his creative freedom, for a prototype two-cylinder boxer engine. Inspired by BMW motorcycles from the 1930s and racecars from the early 1960s, this one-of-a-kind bike will be on display for the first time at the Handbuilt Motorcycle Show in Austin, Texas: The Revival Birdcage.

PROFILE DESCRIPTION.

Bike

Birdcage

Shop

Revival Cycles

Customizer

Alan Stulberg

Construction

2018/2019

Category

Land Speed Racer

BETWEEN REVIVAL AND CITATION.

Customizer Alan Stulberg impressively demonstrated in 2016 he knows how to interpret the history of BMW Motorrad with the Revival Henne BMW Landspeeder. With this complete Birdcage Build, Alan brought back to life the spirit of the era when Ernst Henne set world records on BMW motorcycles. The frame design references racecars of the early 1960s, giving all the attention to the powerful boxer engine.

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A masterpiece made of titanium and 134 parts.

A masterpiece made of titanium and 134 parts.

The frame Alan designed gives an unobstructed view of the engine and drive linkage. Its rods are so thin an observer can see through the frame. The builder used 9 millimeter titanium rods for the first time; welding together 134 parts to create an impressive and delicate design based on the lattice tube frame of a Maserati Birdcage. This design is experiencing a revival at this custom shop. “I wanted to establish the engine as the absolute most extraordinary feature of the build.” Alan also plays around with asymmetry, a theme that forms the leitmotif for the frame and bike: the staggered cylinders, the drive linkage on the right side of the motorcycle, and other components installed asymmetrically.

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To the limit.

To the limit.

Alan normally prefers subtle, elegant lines, themes, materials, and colors over overt, bright, strange, and eye-catching styles. When building the Birdcage, he opted for a less subtle approach: “I’ve become more showy and started pushing the boundaries.” The Revival Cycles shop also focuses on uniqueness when it comes to the tires: These customizers use 23 inch slicks from Dunlop, which are pure prototypes. “We are the only ones in the world who have them.” And there was even a temporary cooperation between customizers: Craig Rodsmith (Rodsmith Motorcycles) was a guest for four days at Revival Cycles. This metalworking master completed the engine covers made of naturally polished aluminium and designed by Alan. These covers emphasize the curves and oval shape of the engine.

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"
This new giant boxer had me dreaming of the power and torque it must be capable of right away! I always wanted to build a frame in Birdcage style, inspired by the racecars of the early 1960s. "

Alan Stulberg

Revival Cycles

THE BIKE IN DETAIL.

Frame

9 mm titanium rod, 134 parts

 

Front suspension

Fork made by Revival Cycles

 

Rear suspension

Pinion made by Revival Cycles

Exhaust

Hand-made from titanium by Revival Cycles

Bodywork (including tank, trim panel, and seat bench)

All the control elements, like the handlebar, footrests, gear and brake levers, as well as the seat, are shaped and finished by hand at Revival Cycles

 

Paint

Aluminum and black

 

Birdcage by Revival Cycles
Front shock absorbers of Birdcage
Side view of Birdcage
Rear suspension from Birdcage
Detail view of the frame construction
View of the rear wheel with brake disc
Birdcage from behind and from above
Birdcage with engine and seat

MAGIC IN TECHNOLOGY.

Dreams become a reality.

Dreams become a reality.

From the very first look at the new BMW Motorrad engine, Alan was impressed by its aesthetic and powerful presence. “This giant boxer, with its power and torque, has enormous potential,” explains Alan. The idea to design a bike like this laid dormant in his mind for many years, and with this engine from BMW Motorrad, the opportunity arose. A very time-intensive process begins, six months alone for the concept’s drawings and lines. Then Alan decided on the wheel and tire sizes before creating the CAD drawings for the geometry and mechanics, then developed the model in order to review the aesthetics, physics, and functionality.

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Against the routine.

The Revival Birdcage is right up Alan's alley. “This was far and away a very liberating and personally enjoyable project because I had the creative freedom to build the bike according to my vision,” summarizes the American. Alan already had the hang of motorcycles, their design and mechanics. He is fascinated by technology; he feels its magic. After leaving his sales job in 2007, Alan turned his hobby into a project that earned him enough money to never have to go back to the routine of a nine-to-five job. “I just couldn't stop changing and modifying every mechanical item that I owned or worked on.” He took matters into his own hands: There is always a revival to develop. And now, Alan has brought this custom Birdcage bike to life.

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Not available for purchase through authorized BMW motorcycles dealers.

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Departed.

A spectacular motorcycle construction from Custom Works ZON.

A spectacular motorcycle construction from Custom Works ZON.

Disclaimer

Customized motorcycle. Not for sale. The vehicles shown are modified and equipped with third-party accessories and/or proprietary parts that are neither manufactured, distributed nor tested by BMW. BMW assumes no liability for the modifications (including the installation, characteristics and use of the accessories shown). CAUTION: Modification of production vehicles (including the installation and use of third-party and proprietary parts) may impair riding characteristics! Riding our vehicles in modified condition is at your own risk.

Suitable motorcycles.

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