$10,999.00
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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