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MotoLibrary Score
67/100Sporty
Power
91 HP
Torque
157 Nm
Engine
1802 ccm
Technical Overview
2021 Bmw R 18 Custom Technical Analysis & Specification Breakdown
Engineered by Bmw for the prototype - concept model motorcycle segment, the 2021 Bmw R 18 Custom relies on a 1802 cc (110 cu in) oil & air-cooled two cylinder boxer, four-stroke powerplant. In factory specification, peak output is rated at 91 HP (66.4 kW) at 4,750 rpm while maximum torque reaches 157.3 Nm (116 lb-ft) at 3,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and shaft drive (cardan) final drive. With a specific output of 50.5 HP per liter and a 1,750 rpm working window between peak torque (3,000 rpm) and peak power (4,750 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
Rider ergonomics and chassis geometry center around a 690 mm (27.2 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops. The 16.01-liter (4.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
50.5 HP/L
Power Band Window
3,000–4,750 rpm
Standover Height
690 mm (27.2 in)
Engine
Displacement1802.0 ccm (109.96 cubic inches)
Engine TypeTwo cylinder boxer, four-stroke
Power91.0 HP (66.4 kW)) @ 4750 RPM
Torque157.3 Nm (16.0 kgf-m or 116.0 ft.lbs) @ 3000 RPM
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.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
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.
