2025 Harley-Davidson Street Glide Ultra vs 2021 BMW K1600 Grand America vs 2021 BMW K1600 Grand America

Full specifications comparison • 3 motorcycles

Comparing 3 motorcycles
2025 Harley-Davidson Street Glide Ultra 2025 Harley-Davidson Street Glide Ultra

Touring

Engine
Four stroke, V-Twin, Milwaukee-Eight 117, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder
Power
105 hp / 78 kW @ 4600 rpm
Top Speed
N/A
Weight
377 kg / 831 lbs
2021 BMW K1600 Grand America 2021 BMW K1600 Grand America

Touring

Engine
In-line six, four-stroke
Power
118 kW / 160.5 hp @ 7750 rpm
Top Speed
162.0 km/h / 100.7 mph
Weight
802.5 pounds
2021 BMW K1600 Grand America 2021 BMW K1600 Grand America

Touring

Engine
In-line six, four-stroke
Power
N/A
Top Speed
162.5 km/h / 101.0 mph
Weight
802.5 pounds
Full Specifications
General
Comments-Audio system with Bluetooth. Cruise control. DTC (Dynamic Traction Control) Dynamic ESA (Electronic Suspension Adjustment). Seat heating. Topcase. Windscreen high.
Year20252020 - 21
Colours-Black Storm Metallic, Imperial Blue Metallic, Hockenheim Silver Metallic
Make ModelHarley Davidson Street Glide UltraBMW K1600 Grand America
Dimensions
Seat Heigth -Alternate (in.)-30.7 inches
Seat Heigth -Alternate (mm)-780 mm
Seat Height-750 mm / 29.5 in.
Wheelbase-1618 mm / 63.7 in.
Height-1440 mm / 56.7 in.
Length-2560 mm / 100.8 in.
Seat Height (Laden)683 mm / 26.9 in-
Width-1000 mm / 39.4 in.
Weights & Capacities
Dry Weight377 kg / 831 lbs-
Fuel Capacity22.7 Litres / 6.0 US gal26.50 litres / 7.00 US gallons
Wet Weight-364.0 kg / 802.5 lbs
Performance
Top Speed-162.5 km/h / 101.0 mph
Max Power105 hp / 78 kW @ 4600 rpm118 kW / 160.5 hp @ 7750 rpm
Max Torque176 Nm / 130 lb-ft @ 3250 rpm175 Nm / 17.8 kgf-m / 129 lb-ft @ 5250 rpm
Engine
Displacement (ci)-100.62 cubic inches
Engine Type-In-line six, four-stroke
Fuel Control-Double Overhead Cams/Twin Cam (DOHC)
CO2-132.2 CO2 g/km. (CO2 - Carbon dioxide emission)
Bore x Stroke (mm)-72.0 x 67.5 mm
Bore x Stroke (in,)-2.8 x 2.7 inches
Displacement (cc)-1649.0 cc
Displacement1923 cc / 117 cu-in1649 cc / 100.6 cu in.
Engine DetailFour stroke, V-Twin, Milwaukee-Eight 117, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinderFour stroke, transverse six cylinder, 4 valves per cylinder
Fuel System-Injection. Electronic fuel injection with ride-by-wire throttle system
Bore x Stroke103.5 x 114.3 mm72 x 67.5 mm
Compression Ratio10.3:112.2:1
Cooling SystemAir cooledLiquid cooled
Emissions-Closed-loop 3-way catalytic converter, emission standard EU-4
Engine Lubrication-Dry sump
Exhaust2-1-2 Dual exhaust with tapered mufflers-
Fuel Consumption-5.70 litres/100 km (17.5 km/l or 41.27 mpg)
Fuel InductionElectronic sequential port fuel injection (ESPFI)52mm Throttle valve diameter, BMS-X
Fuel Reserve-4 Litres / 1.1 US gal
Fuel Type-Premium unleaded (95 RON)
IgnitionSingle-fire, non-wasted, map-controlled spark ignitionDigital CDI
LubricationPressurized, dry-sump with oil cooler-
StarterElectricElectric
Valve System-4
EV Specifics
Battery Capacity-12 V / 19 Ah maintenance free
Drivetrain
ClutchPressurized, dry-sump with oil coolerMulti-plate wet clutch, hydraulically operated
Final DriveBelt, 32/68 ratioShaft drive (cardan)   (final drive)
Gear Ratios1st 9.593; 2nd 6.65; 3rd 4.938; 4th 4.000; 5th 3.407; 6th 2.8751st 2.23 / 2nd 1.641 / 3rd 1.319 / 4th 1.101 / 5th 0.926 / 6th 0.788
Gearbox-6-speed
Primary DriveChain, 34/46 ratio-
Transmission / Drive6-Speed, cruise driveConstant-mesh 6-speed gearbox, helical cut
Chassis
Frame Type-Aluminum bridge-type frame with load-bearing engine
Suspension - Front-BMW Motorrad Duolever
Suspension - Rear-Paralever (single-sided swing arm), central spring strut, rebound/continuously variable, Dynamic ESA semi-active suspension (road and dynamic modes)
Lean Angle31°-
Rake-27.8°
Steering Head Angle-62.2°
SwingarmMild steel; two-piece drawn and welded section; forged junctions; MIG welded-
Trail-108.4 mm / 4.3 in
Wheel Travel - Front117 mm / 4.6 in115 mm / 4.9 in
Wheel Travel - Rear76 mm / 3.0 in135 mm / 5.3 in
Electrical Systems
Alternator-W 700
Lighting system-Xenon headlight
Wheels & Brakes
Brakes - Front-2 x 320mm discs, 4 piston calipers
Brakes - Rear-Single 320mm disc, 2 piston caliper
ABSStandardBMW Motorrad ABS (partial integral)
Rims-Cast aluminium
Rims - Front-3.0 x 17
Rims - Rear-6.00 x 17
Tyres - Front-120/70 ZR17
Tyres - Rear-190/55 ZR17
WheelsCast AluminiumCast aluminium wheels
Wheels - Front3.5 x 19 in-
Wheels - Rear5.0 x 18 in-

Verdict

Winner on specs

2021 BMW K1600 Grand America

The 2021 BMW K1600 Grand America edges out the 2025 Harley-Davidson Street Glide Ultra thanks to its more peak power, lighter kerb weight, liquid cooling, dual front discs and higher rear wheel travel. Specifications are one part of the picture - dealer support, parts availability, and intended use all matter too.

Key Differences

2025 Harley-Davidson Street Glide Ultra - Advantages

  • Fuel injection: Precise fuelling, better cold-start reliability, and lower maintenance requirements.
  • Larger displacement: 1923 cc vs 1649 cc - more cubic capacity means broader torque delivery and greater low-end pull.

2021 BMW K1600 Grand America - Advantages

  • More power: Produces 118 kW vs 105 hp - a meaningful performance advantage.
  • Lighter: 336 kg vs 377 kg - easier to handle and less fatiguing on long trips.
  • Liquid cooling: Consistent engine temperature in stop-start traffic and hot climates.
  • Dual front discs: Greater stopping power and better heat management under hard braking.
  • More rear wheel travel: 125 mm vs 76 mm - absorbs bigger hits and rough terrain better.

2025 Harley-Davidson Street Glide Ultra vs 2021 BMW K1600 Grand America - FAQs

What are the engine differences between the 2025 Harley-Davidson Street Glide Ultra and 2021 BMW K1600 Grand America?
The 2025 Harley-Davidson Street Glide Ultra uses Four stroke, V-Twin, Milwaukee-Eight 117, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder, while the 2021 BMW K1600 Grand America is powered by In-line six, four-stroke.
Which is lighter, the 2025 Harley-Davidson Street Glide Ultra or the 2021 BMW K1600 Grand America?
The 2021 BMW K1600 Grand America is lighter at 336 kg compared to 377 kg for the 2025 Harley-Davidson Street Glide Ultra - a difference of 41 kg. This is a meaningful difference that affects handling and rider fatigue.
Which has more power, the 2025 Harley-Davidson Street Glide Ultra or the 2021 BMW K1600 Grand America?
The 2021 BMW K1600 Grand America produces more peak power at 118 kW, compared to 105 hp for the 2025 Harley-Davidson Street Glide Ultra.
Which should I buy, the 2025 Harley-Davidson Street Glide Ultra or the 2021 BMW K1600 Grand America?
Both are strong choices. The 2025 Harley-Davidson Street Glide Ultra has the edge in fuel injection and larger displacement, while the 2021 BMW K1600 Grand America stands out for more peak power and lighter kerb weight. Visit dealers, arrange test rides, and factor in local parts and service costs - these often matter as much as the spec sheet.