Overview

2026 Beta RX450

Motorcycle

450 RX

450 RX: Proven through races all over the world, including the USA Supercross series and MXGP. The 450 RX provides a ride like no other, quick turning yet stable; powerful yet easy to ride, are just a few things the press is saying about the 4-stroke model. An engine with enough power for a top-level pro rider while providing the right amount of power to the amateur as well. For 2026, the 450 RX receives a new cylinder head with improved flow that provides even more power. This, along with a matched intake manifold and a new exhaust, means the 450 will still bark with power but do it in a quieter way. A redesigned counterbalance shaft to reduce vibration and new mapping to go with the new cylinder head and exhaust.


 

Specs and Features

Specifications
ENGINE TYPE
Single cylinder, 4 –stroke, liquid cooled, 4-valve with electric start.
BORE
97mm
STROKE
60.8mm
DISPLACEMENT
449.3cc
COMPRESSION RATIO
13.5:1
VALVE TRAIN
Finger followers w/ shim adjustment
IGNITION
Dual-Map Kokusan with Traction Control
SPARK PLUG
NGK LKAR8A-9
LUBRICATION
Twin Oil Pumps w/Cartridge Filter & Separate Compartments For Engine & Transmission
FUEL SYSTEM
46mm Throttle Body
CLUTCH
Hydraulic, adjustable diaphragm multi-plate clutch
TRANSMISSION
5 Speed
FINAL DRIVE
DID drive chain
FRAME
Molybdenum steel / Double Cradle w/ push button seat and quick air filter access
WHEELBASE
58.1"
SEAT HEIGHT
37.2"
GROUND CLEARANCE
13.2"
FOOTREST HEIGHT
16.6"
DRY WEIGHT
230.4 lbs (dry weight, no fuel)
FUEL TANK CAPACITY
1.5 US Gallons
FRONT SUSPENSION
48 mm KYB AOS closed cartridge fork, adjustable compression & rebound
REAR SUSPENSION
KYB 50mm body with adjustable rebound and high/low speed on compression adjustment
FRONT WHEEL TRAVEL
12"
REAR WHEEL TRAVEL
11.8"
FRONT BRAKE
260 mm floating rotor
REAR BRAKE
240 mm rotor
FRONT/REAR RIM
21" (Front) 19" (Rear)
FRONT/REAR TIRE
80/100 | 110/90
SPECS
*Specifications subject to change without notice Additional information on all models including manuals, accessories, and
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