As the mastermind behind Thibeault Motorcraft in San Rafael, CA, Scott Thibeault isn’t your average weekend wrench. He spent 25 years as an industrial and product designer, cutting his teeth at the design firm, frog, before leaving the corporate world in 2022 to chase the spark he felt in the garage. His philosophy is rooted in obsessive detail and a refusal to compromise on quality.
This custom BMW is the final feature in our Road to Barber series, highlighting the master craftsman heading to the Builder’s Best Show presented by the BMW MOA. The show is a cornerstone event at BMW Motorrad Days, taking place within the Barber Vintage Festival in Birmingham, AL, from October 9-11. We’ve already taken deep dives into machines from builders like Marek Kruszynski, Parker Zamarelli, and Zack Witkowsky. Still, Thibeault’s bare-metal brawler brings a decidedly different flavor to the show.
To appreciate where Thibeault took this build, you have to look at what it was and what inspired it. The donor was a 1972 BMW /5, a machine famous for its bulletproof reliability. But Thibeault’s vision bypassed the 1970s entirely, looking back to the mid-1950s to the purpose-built aggression of BMW’s Rennsport racers.
The transformation began at the core. Scott stripped the original frame down to the metal and reworked the factory joints for a cleaner, stronger finish. A custom rear subframe was fabricated in-house to tighten the bike’s proportions, paired perfectly with a set of fully adjustable TFX shocks. Up front, the vintage forks were ditched in favor of a modern suspension setup transplanted from a 2018 Suzuki GSX-R1000. Both ends were tuned to the rider’s specific weight and style, gifting the 50-year-old airhead a chassis that actually knows what to do with a corner.
But a race-bred chassis is nothing without a heart to match. Thibeault tore the 50-year-old drivetrain down to the bare cases, cleaned and blasted everything, then rebuilt it. To improve balance and reduce rotational inertia, Thibeault removed every gram of unnecessary mass, including a lighter flywheel and a perfectly balanced crankshaft.
To add more punch, a Siebenrock 1,000cc top-end kit was installed, bolstered by custom titanium lifters, pushrods, and valves. The result is an airhead engine with a dramatically sharper throttle response and a willingness to rev that its original Bavarian engineers could hardly have imagined. To put that power to the pavement effectively, the transmission was re-geared, getting a shorter first gear for aggressive off-the-line launches and a taller fifth gear for relaxed, high-speed sweeping corners.
With that much momentum on tap, the factory brakes were woefully inadequate. Thibeault gave the motorcycle a massive upgrade, fitting twin 320mm front rotors clamped by Brembo four-piston monoblock racing calipers. Out back, the antiquated drum brake was binned for a modern Brembo disc setup. Custom hubs were laced to vintage Excel H rims wrapped in Bridgestone BT46R rubber.
The electrical system was rewired around a Motogadget m.unit Blue controller. Euro MotoElectrics (EME) supplied the upgraded charging and ignition hardware to keep the fire lit. Motogadget LED indicators handle the signaling duties with minimalist precision.
Then there is the bodywork, the undeniable crown jewel of the build. Evan Wilcox masterfully shaped the fuel tank, fenders, and headlight housing as custom, one-off aluminum pieces. Thibeault fabricated every mounting bracket in-house to ensure flawless fitment. Rather than hide the craftsmanship beneath layers of paint, the finish was left deliberately raw. Polished aluminum and brushed stainless steel dominate the visual landscape, leaving the reworked frame as the lone painted element on the entire motorcycle.
And the timeline? Twelve weeks. That is the razor-thin margin Scott Thibeault gave himself to turn a tired 1972 BMW /5 into a raw, unpainted, race-bred masterpiece. It takes a certain kind of calculated madness to tear a vintage airhead down to the welds and rebuild it as a modern homage to BMW’s legendary 1954 RS Rennsport, let alone on a ticking clock. But for Thibeault, it was just another day in the shop.
Photos only tell half the story. To see the raw metal catch the light in person, you’ll need to head down south this fall. Scott Thibeault will have this brilliant RS Tribute on full display at the Builder’s Best Show presented by BMW MOA during the Barber Vintage Festival in Birmingham, AL, October 9-11.
