At the heart of the 2025 Janus Gryffin 450 classic motorcycle, Janus features a 445 cc (27.2 cu in) oil & air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 30 HP (21.9 kW) at 7,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 67.4 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Gryffin 450 measures 149.7 kg (330 lbs) dry, translating to a power-to-weight ratio of 0.2 HP/kg (4.99 kg per horsepower). Rider ergonomics and chassis geometry center around a 813 mm (32 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,346 mm (53 in) wheelbase engineered for quick, flickable steering geometry. The 8.33-liter (2.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 145 km/h (90 mph).
Specific Output
67.4 HP/L
Power-to-Weight
0.2 HP/kg (4.99 kg/HP)
Standover Height
813 mm (32 in)
Engine
Displacement445.0 ccm (27.15 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSWM engine
Power30.0 HP (21.9 kW)) @ 7500 RPM
Compression10.1:1
Valves/Cylinder4
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCDI
LubricationDry sump with gerotor pump, cartridge filter, and oil cooler
CoolingOil & air
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet multiplate
Performance
Top Speed144.8 km/h (90.0 mph)
Chassis
Frame TypeDOM tubular steel double cradle
Front SuspensionProprietary leading-link fork with dual progressive coil-over Ikon shocks
Front Travel140 mm (5.5 inches)
Rear SuspensionProprietary swing-arm with dual progressive coil-over Ikon shocks
Wheelbase1346 mm (53.0 inches)
Wheels & Brakes
Front Tyre2.75-21
Rear Tyre4.60-17
Front BrakesSingle disc. Two-piston caliper, Brembo
Front Brake Ø280 mm (11.0 inches)
Rear BrakesSingle disc. Single Piston caliper, Brembo
Rear Brake Ø220 mm (8.7 inches)
WheelsCNC machined aluminum hubs with aluminum alloy rims and stainless steel straight-pull spokes
Dimensions & Weight
Dry Weight149.7 kg (330.0 pounds)
Power/Weight0.2004 HP/kg
Seat Height813 mm (32.0 inches) If adjustable, lowest setting.
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.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
