Naked Motorcycles
2021Janus Halcyon 450
36 fields on record
The 2021 Janus Halcyon 450 is a versatile all-rounder powered by a 445cc single-cylinder four-stroke engine producing 30 horsepower, making it ideal for novice and intermediate riders seeking an accessible middleweight. Its air-cooled design and straightforward mechanicals prioritize reliability and ease of maintenance, while the modest 144.8 km/h top speed ensures manageable performance for everyday riding and light touring.
- Capacity
- 445.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 160.6 kg
- Seat height
- 762 mm
- Power
- 30.0 HP (21.9 kW) @ 7500 RPM
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It's built for relaxed cruising and everyday commuting rather than outright speed or long-distance touring.
- Built for
- It has a classic, unhurried cruiser personality with simple mechanicals and a laid-back retro feel.
- Not ideal for
- It's not for riders seeking highway-speed touring performance or any serious off-road capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the published US (EPA-style) fuel economy estimate and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Engine
- Capacity
- 445.0 ccm
- Power
- 30.0 HP (21.9 kW) @ 7500 RPM
- CO2 Emissions
- 81 CO2 g/km
- EPA Est. Fuel Consumption
- 3.45 L/100km (68.2 US mpg)
- EPA CO Emissions
- 5.9 CO g/km
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.1868 HP/kg (dry)
- Compression
- 10.1:1
- Cooling system
- Air
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- CDI
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
- Lubrication system
- Dry sump with gerotor pump, cartridge filter, and oil cooler
- Torque
- Not on record - add it
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Clutch
- Wet multiplate
Performance
- Top speed
- 144.8 km/h (90.0 mph)
Dimensions & weight
- Wheelbase
- 1422 mm
- Overall length
- 2184 mm
- Overall width
- 787 mm
- Overall height
- 1041 mm
- Seat height
- 762 mm
- Dry weight
- 160.6 kg
- Fuel capacity
- 7.60 litres
Chassis & suspension
- Frame
- DOM tubular steel cradle
- Front suspension
- Proprietary dual progressive shock leading-link
- Rear suspension
- Proprietary cantilever transom with dual progressive coil-over Ikon shocks
Brakes & wheels
- Front brakes
- Double disc. Two-piston caliper Brembo
- Front brakes diameter
- 280 mm
- Rear brakes
- Single disc. Single Piston caliper brembo
- Front tyre
- 4.00-18
- Rear tyre
- 4.50-18
Other
- Color options
- British Racing Green, Vintage Red, Aga Cream, Black, American Blue, Charcoal, Olive, Cardinal Red
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|
| Capacity | 445 cc | 445 cc | 445 cc | 445 cc |
| Dry weight | 161 kg | 161 kg | 157 kg | 165 kg |
| Seat height | 762 mm | 762 mm | 762 mm | 762 mm |
| Fuel capacity | 7.6 L | 7.6 L | 7.6 L | 7.6 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Janus Halcyon 450?
The 2021 Janus Halcyon 450 has a Capacity of 445.0 ccm (27.16 cubic inches).
What engine power does the Janus Halcyon 450 have?
The 2021 Janus Halcyon 450 has a Power of 30.0 HP (21.9 kW) @ 7500 RPM.
How many gears does the Janus Halcyon 450 have?
The 2021 Janus Halcyon 450 has a Gearbox of 5-speed.
How much does the Janus Halcyon 450 weigh?
The 2021 Janus Halcyon 450 has a Dry weight of 160.6 kg (354.1 pounds).
Shop this bike
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The 2021 Janus Halcyon 450 motorcycle is a stunning combination of classic design and modern performance. With its retro-inspired looks and powerful 450cc engine, this bike is a head-turner on the road. The attention to detail is evident in every aspect of the Halcyon 450, from its hand-built frame to its vintage-style components. Whether you're cruising around town or hitting the open road, this motorcycle delivers a smooth and comfortable ride, making it a joy to ride.
The Janus Halcyon 450 motorcycle is a true testament to the craftsmanship and quality that Janus Motorcycles is known for. It's no wonder that this bike has garnered attention from enthusiasts and riders alike. With its timeless aesthetic and impressive performance, the 2021 Janus Halcyon 450 is a standout in the world of classic motorcycles. If you're in the market for a bike that offers a perfect blend of style and substance, look no further than the Janus Halcyon 450.
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