These are the known mechanical and performance specifications for your 2021 Honda CRF450RX.
Basic Specs

Engine
Displacement449.0 ccm (27.40 cubic inches)
Type38mm intake valve, titanium; 31mm exhaust, steel
DetailsSingle cylinder, four-stroke
Max RPM
Compression13.5:1
Bore/Stroke96.0 x 62.0 mm (3.8 x 2.4 inches)
Valves/Cylinder4
FuelingInjection. Programmed Fuel Injection (PGM-FI)
IgnitionDC-CDI
Exhaust
Lubrication
CoolingLiquid
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity7.95 litres (2.10 US gallons)
Emissions
Chassis
Frame TypeSemi-double cradle, aluminium twin-spar
Rake27.7 deg
Trail114 mm (4.5 inches)
Front Suspension49mm inverted Showa fork with rebound and compression damping adjustability
Front Travel310 mm (12.2 inches)
Rear SuspensionPro-Link® Showa single shock with adjustable spring preload, rebound and compression damping adjustability
Rear Travel312 mm (12.3 inches)
Seat
Seat Height965 mm (38.0 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance335 mm (13.2 inches)
Wheelbase1481 mm (58.3 inches)
Dry Weight
Wet Weight113.9 kg (251.0 pounds)
Wheels & Brakes
Front Tire/Tyre90/90-21
Rear Tire/Tyre120/90-18
Front BrakesSingle disc. Two-piston calipers.
Front Brake Diameter260 mm (10.2 inches)
Rear BrakesSingle disc
Rear Brake Diameter240 mm (9.4 inches)
WheelsDunlop Geomax AT81 tires
Comments
Model ID: CRF450RX.