R 100 RS

1977 BMW R 100 RS Technical Analysis & Specification Breakdown

At the heart of the 1977 BMW R 100 RS classic motorcycle, BMW utilizes a 979 cc (59.7 cu in) air-cooled two cylinder boxer, four-stroke layout. In factory specification, peak output is rated at 70 HP (51.1 kW) at 7,250 rpm, transferring power to the rear wheel through a 5-speed gearbox and shaft drive (cardan) final drive. With a specific output of 71.5 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the R 100 RS measures 247 kg (545 lbs) wet (curb), translating to a power-to-weight ratio of 0.28 HP/kg (3.53 kg per horsepower). The 24-liter (6.3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 193 km/h (120 mph).

Within MotoLibrary's BMW archive, this model family spans 12 indexed model years from 1976 to 1989, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.