BMW R 100 RS Special by Ritmo Sereno

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Ritmo Sereno’s BMW R 100 RS Special keeps the air-cooled boxer and the unmistakable outline of an RS fairing, then redraws both around a much tighter sporting theme. The metallic orange-and-silver bodywork, black wheels and single-seat tail give this customer-commissioned motorcycle a compact, deliberate stance, while the exposed cylinders ensure it still reads as a BMW at a glance.

The fairing becomes the focal point

The most effective change is the treatment of the front bodywork. The broad fairing remains, but its lower section is opened around the cockpit and front suspension, making the round headlamp and gold-finished fork legs part of the design rather than hiding them behind a touring shell. A tall clear screen and matching orange front mudguard preserve the RS identity, while pale pinstriping and silver inserts break up the large painted surfaces.

That same balance continues rearward. The ribbed black solo seat sits on a shortened-looking tail section, with a pale side panel echoing the fairing’s contrasting centre. From the side, the slim rear structure leaves the boxer engine, rear shock and exhaust clearly visible. It is a much lighter visual composition than the donor motorcycle’s original two-up touring arrangement.

A modern chassis around the boxer

The supplied description identifies the donor as a 1991 R100 RS and lists Öhlins suspension at both ends. The rear shock is especially prominent beneath the seat, while the front end combines gold fork legs with Brembo braking hardware and twin discs. Black multi-spoke wheels and broad, contemporary-looking tyres add to the bike’s modern chassis language without overwhelming the horizontally opposed engine.

The engine remains the centrepiece rather than something concealed by cosmetic work. Finned cylinder heads project cleanly from the frame, and the listed Keihin FCR carburettors sit high behind the fairing opening. A custom 2-into-1 exhaust follows a compact route along the right side before ending in a large silencer. According to the source description, its packaging also involves a modified centre stand—an unusually visible solution on a motorcycle where the exhaust normally attracts plenty of attention.

Reported numbers, purposeful result

Ritmo Sereno reportedly brought the motorcycle from approximately 230 kilograms to about 175 kilograms, using handmade aluminium parts including the battery holder, oil catch tank and a frame section behind the engine. The finished bike is certainly presented with less visual mass, but those figures should be understood as reported specifications rather than independently verified measurements.

The same applies to the quoted output of approximately 80 bhp at the rear wheel. More important to the design is how consistently the changes support one idea: retain the familiar BMW mechanical layout and RS silhouette, then sharpen every surrounding detail. The result is not a generic café racer, but a deliberately reworked boxer with endurance-racer proportions and a strong sense of its own origin.

Source: Bike EXIF.

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