Positioned in Arch's sport motorcycle lineup, the 2021 Arch 1s pairs a 2032 cc (124 cu in) liquid-cooled v2, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 120 HP (87.6 kW) while maximum torque reaches 163 Nm (120.2 lb-ft), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 59.1 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the 1s measures 244.9 kg (540 lbs) dry, translating to a power-to-weight ratio of 0.49 HP/kg (2.04 kg per horsepower).
Within MotoLibrary's Arch archive, this model family spans 5 indexed model years from 2018 to 2024, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
59.1 HP/L
Power-to-Weight
0.49 HP/kg (2.04 kg/HP)
Engine
Displacement2032.0 ccm (123.99 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsARCH/S and S Cycle T124 45-degree V-twin
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
