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Beta's first two-stroke motocross bike, a 300 built from the RR with a 19-inch rear wheel and MX suspension. Replaced by the RX 350 for 2026.
| 99.8 kg |
| 940 mm |
| US$9,199 |
| 2023 | 99.8 kg | 940 mm | US$9,399 |
| 2024 | 99.8 kg | 940 mm | US$9,399 |
| 2025 | 99.3 kg | 945 mm | US$9,499 |
| 2026 | 46.2 hp | 100 kg | 945 mm | US$10,290 |
| 2027 | 100 kg | 945 mm | US$10,290 |