A recent study may have disproven the “Loud Pipes Saves Lives” cliche, but that doesn’t mean that motorcyclists don’t enjoy the visceral experience a throaty exhaust note provides. Of course, on electric motorcycles, noise emissions are a thing of the past, but some riders aren’t willing to sacrifice sound for a greener footprint. For those folks, Italian custom shop E-Racer repurposed a Bose sound system for its latest Zero SR/F project.
E-Racer made headlines in 2019 with the Edge, a Zero SR/F-based build that transformed the modern naked bike into a neo-café racer. The custom garage still picks the Zero SR/F for its Bestial-E project, but this time around, it goes light on the form and heavy on the function. New carbon fiber bodywork, new side panels, and a shorter tank cover streamline the Zero’s silhouette, turning it into a fit and trim streetfighter.
Sleek handlebars and a round LED headlight maintain the minimalist aesthetic up front while the new single-seat tail section keeps the SR/F light on its feet. The naked electric bike maintains its power figures with 110 horsepower and 140 lb-ft of torque on tap, but E-Racer enhances the Zero’s stopping power by swapping out the stock J.Juan brakes for Brembo units. An Airtender system also improves the bike’s standard rear shock, but the Bose speakers still steals the show.
Bose may not produce a motorcycle-oriented sound system, but E-Racer wedges two external speakers under the faux fuel tank and between the trellis frame struts to alert fellow motorists and pedestrians. Operated by Bose’s dedicated app, the two speakers transmit high frequencies to signal the motorcycle's direction of travel. While Zero SR/F fans may be fond of the tank trunk, a third Bose speaker unit sends subsonic frequencies (< 16 Hz) through the motorcycle chassis to imitate the sensation of a vibrating internal combustion engine.
Unfortunately, E-Racer hasn’t revealed whether users can alter the soundtrack and vibration to match different engine configurations such as parallel-twins, V-twins, V4s, or inline-fours. But, the Bestial-E still combines future tech with visceral sensations of yesteryear.