Royal Alloy Grand Prix 300S vs Sym HD 300 (2025)
Side-by-side spec comparison, pricing, and a plain-English breakdown of how the Royal Alloy Grand Prix 300Sstacks up against the Sym HD 300. Numbers pulled from manufacturer spec sheets — click either bike for the full review.
Spec comparison
| Spec | Royal Alloy Grand Prix 300S | Sym HD 300 |
|---|---|---|
| Model year | 2025 | 2024 |
| Price | — | — |
| Engine | 278 cc | 278 cc |
| Torque | — | 26 Nm |
| Weight | 154 kg | — |
| Seat height | — | 32 mm |
| Fuel capacity | — | 2.6 L |
| Fuel type | petrol | petrol |
| Transmission | — | Automatic |
| Front brakes | — | Single disc. ABS. |
| Rear brakes | — | Single disc. ABS. |
| Tires | Pirelli 110/70-12 / Pirelli 120/70-12 | 110/70-16 / 140/70-16 |
Royal Alloy Grand Prix 300S vs Sym HD 300 — which should you buy?
Picking between the Royal Alloy Grand Prix 300S and the Sym HD 300 usually comes down to the numbers you care about most. On paper, the Royal Alloy Grand Prix 300S brings its published horsepower in a 154 kg package, while the Sym HD 300 counters with its own power figure.
Our spec tables above highlight the winning number on each line. For the full rider-focused reviews including real-world fuel economy, service costs and available colors, click into either bike: