14 August. Friday 2026
Janus Gryffin 450 - 2025 Specifications and Reviews
The 2025 Janus Gryffin 450 is a classic-styled middleweight motorcycle powered by a reliable 445cc SWM single-cylinder engine producing 30 horsepower. Best suited for riders seeking vintage aesthetics with modern fuel injection and dependable performance, it excels as an accessible everyday commuter and weekend cruiser. Its efficient air-oil cooling and dry-sump lubrication deliver consistent reliability for casual riders prioritizing character over raw power.
2025
General information | |
| Color Options | British Racing Green, custom colours |
| Category | Classic |
| | |
Engine and Transmission Specifications | |
| Starting | Electric |
| Clutch | Wet multiplate |
| Final Drive | Chain (final drive) |
| Gearbox | 5-speed |
| Cooling System | Oil & air |
| Ignition | CDI |
| Fuel Control | Single Overhead Cams (SOHC) |
| Induction | Injection |
| Valves Per Cylinder | 4 |
| Compression Ratio | 10.1:1 |
| Max Power | 30.0 HP (21.9 kW)) @ 7500 RPM |
| Engine Details | SWM engine |
| Capacity: | 445.0 ccm (27.15 cubic inches) |
Physical measures and capacities | |
| Fuel Capacity | 8.33 litres (2.20 US gallons) |
| Wheelbase | 1346 mm (53.0 inches) |
| Overall Length | 2108 mm (83.0 inches) |
| Seat Height | 813 mm (32.0 inches) If adjustable, lowest setting. |
| Power/Weight Ratio | 0.2004 HP/kg |
| Dry Weight | 149.7 kg (330.0 pounds) |
| | |
Janus Gryffin 450 dimensions and frame | |
| Seat | Sargent |
| Wheels | CNC machined aluminum hubs with aluminum alloy rims and stainless steel straight-pull spokes |
| Rear Brakes | Single disc. Single Piston caliper, Brembo |
| Brake Disc Diameter | 220 mm (8.7 inches) |
| Front Brakes | Single disc. Two-piston caliper, Brembo |
| Rear Tyre | 4.60-17 |
| Front Tyre | 2.75-21 |
| Rear Suspension | Proprietary swing-arm with dual progressive coil-over Ikon shocks |
| Front Wheel Travel | 140 mm (5.5 inches) |
| Front Suspension | Proprietary leading-link fork with dual progressive coil-over Ikon shocks |
| Frame | DOM tubular steel double cradle |
Speed and acceleration | |
| Top Speed | 144.8 km/h (90.0 mph) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Update specs | Report missing specs or required updates. |
| Comments | US brand. |
| Warranty | 2-year unlimited-mileage warranty |
| Instruments | Digital |
| Lubrication system | Dry sump with gerotor pump, cartridge filter, and oil cooler |
| Engine type | Single cylinder, four-stroke |
| Model year | 2025 |
| Motorcycle name | Janus Gryffin 450 |
Performance Profile & Rider Fit
30 hp
Peak Power
9.5s
0-60 mph
90 mph
Top Speed
Best For
Track10%
City55%
Cornering45%
Daily Riding50%
Touring35%
Passenger25%
Rider Profile
| Best For | This bike suits riders of any experience level who appreciate low-stress, classic-style riding over outright performance. |
| Purpose | It's built for leisurely, character-filled rides on backroads rather than for speed or long-distance touring capability. |
| Rider Fit | The 813mm seat height combined with a light dry weight under 150kg makes it approachable for shorter or less experienced riders. |
| Character | The Gryffin 450 is a quirky, retro-styled single with a boutique feel, offering a slow, tactile, mechanical riding experience over modern refinement. |
| Not Ideal For | This isn't the machine for riders wanting highway speed, aggressive cornering performance, or serious off-road capability. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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