$10,999.00

300 RX

Beta USA stepped into motocross in 2021 with the original 300 RX, a 2-stroke that quickly earned respect for its sharp looks, solid handling, and a “factory” exhaust note that stood out everywhere it went. Riders also discovered what Beta calls Rideability—the smooth, confidence-building balance of power, control, and comfort that makes a bike easier to ride fast in any conditions.

For 2025, the 300 RX receives key updates to further strengthen its motocross platform. Improvements span the engine, chassis, and suspension, led by an all-new frame inspired by the proven layout of the 450 RX.

Specification 300 RX
ENGINE TYPE Beta Built single cylinder, 2-stroke, liquid cooled, BPV power valve system with counter balancer, electric start (back-up kick starter optional)
BORE 72mm
STROKE 72mm
DISPLACEMENT 293.1cc
COMPRESSION RATIO 13.3:1
VALVE TRAIN Beta Progressive Valve (BPV)
IGNITION AC-CDI Kokusan
SPARK PLUG NGK BR8ECM
LUBRICATION Pre-Mix
FUEL SYSTEM Keihin PWK 38mm
CLUTCH Wet Diaphragm-style
TRANSMISSION 5 Speed
FINAL DRIVE O-ring chain
FRAME Molybdenum steel / Double Cradle w/ quick air filter access
WHEELBASE 58.6″
SEAT HEIGHT 37.2″
GROUND CLEARANCE 13.4″
FOOTREST HEIGHT 16.6″
DRY WEIGHT 219 lbs
FUEL TANK CAPACITY 1.8 US Gallons
FRONT SUSPENSION 48 mm KYB AOS closed cartridge, adjustable compression & rebound
REAR SUSPENSION KYB shock, 50 mm body, adjustable rebound & high/low speed compression
FRONT WHEEL TRAVEL 12.0″
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 Michelin Starcross
MSRP $9,499.00

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