At the heart of the 2021 Suzuki RM-Z450 cross - motocross motorcycle, Suzuki relies on a 449 cc (27.4 cu in) liquid-cooled single cylinder, four-stroke powerplant. Internal engine geometry specifies a bore and stroke of 96.0 x 62.1 mm (3.8 x 2.4 inches) with a 12.5:1 compression ratio.
On the scales, the RM-Z450 measures 112 kg (247 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 960 mm (37.8 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,480 mm (58.3 in) wheelbase engineered for balanced agility and highway composure. The 6.3-liter (1.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Suzuki archive, this model family spans 17 indexed model years from 2008 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
960 mm (37.8 in)
Engine
Displacement449.0 ccm (27.40 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsAluminum cylinder with Suzuki Composite Electrochemical Material (SCEM) coating
Compression12.5:1
Bore x Stroke96.0 x 62.1 mm (3.8 x 2.4 inches)
Valves/Cylinder4
Fuel SystemInjection. 44mm throttle body
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionCDI
LubricationSemi-dry sump
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet, multi-plate rack-and-pinion clutch
DrivelineChain, DID520MXV4, 114 links
Chassis
Frame TypeAluminum alloy, twin-spar
Front SuspensionInverted telescopic, coil spring, oil damped, adjustable damping force
Rear SuspensionBFRC-link type, coil spring, oil damped, adjustable spring preload and damping force
Wheelbase1480 mm (58.3 inches)
Ground Clearance330 mm (13.0 inches)
Wheels & Brakes
Front Tyre80/100-21
Rear Tyre110/90-19
Front BrakesSingle disc
Front Brake Ø270 mm (10.6 inches)
Rear BrakesSingle disc
WheelsBlack anodized rims with a cross-section. Bridgestone X30 tires.
Dimensions & Weight
Weight incl.112.0 kg (246.9 pounds)
Seat Height960 mm (37.8 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.
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.
