A road-legal single-seater built for pure track theater has surfaced for sale in Costa Mesa, California. This 2023 BAC Mono R, offered by dealer iLussoOC, is currently bidding on Bring a Trailer with roughly one day left on the clock and the price already well into six figures.
Introduced at the 2019 Goodwood Festival of Speed, the Mono R sits at the extreme end of the lineup from British Automotive Company, the Liverpool-based outfit that has spent the last decade building street-legal cars that drive like open-wheel racers. Compared with the standard Mono, the R rides 20mm lower, stretches 25mm longer, and sheds more than 50 pounds thanks to graphene-enhanced carbon-fiber body panels, bringing curb weight down to just 1,224 pounds. This particular car wears exposed carbon-fiber bodywork accented with red stripes arranged in a Union Jack pattern, wrapped around a TIG-welded seamless tube steel chassis with a carbon-fiber crash structure.
Power comes from a 2.5-liter Duratec inline-four built by Mountune Racing, rated by the manufacturer at 343 horsepower and 295 lb-ft of torque, with a billet crankshaft, dry-sump lubrication, a ram-air intake, and a gas-flowed cylinder head. It routes through a six-speed Hewland sequential gearbox, an AP Racing clutch, and a Powerflow limited-slip differential, with spent gases exiting through a titanium four-into-two-into-one manifold. In a car this light, that output is enough to make the Mono R one of the more extreme accelerating machines to come out of the United Kingdom in recent memory, placing it in similar territory to other ultra-light track specials we've featured, such as the American-built Drakan Spyder.
The wheel and tire package consists of 17-inch OZ Racing carbon-hybrid wheels wrapped in Pirelli Trofeo R rubber, sized 205/45 up front and 255/40 out back. Pushrod suspension with billet aluminum uprights, adjustable Öhlins dampers, and front and rear anti-roll bars keeps the chassis planted, while four-piston AP Racing Pro 5000 R calipers grip cross-drilled carbon-ceramic discs at all four corners. Inside, the single-seat cockpit is trimmed in black microsuede, with a 290mm Mono R-branded carbon-fiber steering wheel featuring an integrated LCD display and hand controls on a quick-release hub, plus a cockpit-mounted electrical cutoff switch, a brake bias adjuster, and a proper safety harness.
According to the listing, the selling dealer acquired this Mono R in 2026, and the digital odometer shows 793 miles, with only about 10 added under current ownership. The car carries a clean Montana title listing it as a 2023 BACOM, and a Carfax report shows no accidents or reported damage, along with three service history records. Chassis number SA9BUNCB5PR211111 ties the car to BAC's limited production run of the range-topping Mono variant.
Cars this focused rarely come up for sale at all, let alone with sub-1,000-mile odometers, which helps explain the strong early bidding. The auction is scheduled to end July 9, and interested buyers can view the full listing, photos, and bid history on Bring a Trailer. It joins a broader wave of low-volume hypercars that have been hitting the auction circuit lately.
