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Rieju's flagship 300cc two-stroke enduro in its top Pro spec, descended from the GasGas EC 300 and, from 2026, fuel-injected as the MR Pro 300i. For enduro racers and hard-trail riders.
| 105 kg |
| 950 mm |
| 2024 | 105 kg | 950 mm |
| 2025 | 105 kg | 950 mm |
| 2026 | 105 kg | 950 mm |
| 2027 | 103.5 kg | 949 mm |