DSR SM

2021 Um DSR SM Technical Analysis & Specification Breakdown

Built around Um's super motard motorcycle platform, the 2021 Um DSR SM relies on a 124.2 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 14.8 HP (10.8 kW) at 10,500 rpm while maximum torque reaches 10.9 Nm (8 lb-ft) at 8,250 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 119.2 HP per liter and a 2,250 rpm working window between peak torque (8,250 rpm) and peak power (10,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the DSR SM measures 121 kg (267 lbs) dry, translating to a power-to-weight ratio of 0.12 HP/kg (8.18 kg per horsepower). Rider ergonomics and chassis geometry center around a 880 mm (34.6 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,445 mm (56.9 in) wheelbase engineered for balanced agility and highway composure. The 5.26-liter (1.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's Um archive, this model family spans 2 indexed model years from 2018 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.