Fosti F21 vs Keeway RKS 125 E4 (2022)
Side-by-side spec comparison, pricing, and a plain-English breakdown of how the Fosti F21stacks up against the Keeway RKS 125 E4. Numbers pulled from manufacturer spec sheets — click either bike for the full review.
Spec comparison
| Spec | Fosti F21 | Keeway RKS 125 E4 |
|---|---|---|
| Model year | 2022 | 2021 |
| Price | — | — |
| Engine | 124 cc | 124 cc |
| Horsepower | 10 hp | 11 hp |
| Torque | 9 Nm | 9 Nm |
| Weight | 102 kg | 132 kg |
| Seat height | — | 30 mm |
| Fuel capacity | 2.7 L | 4.2 L |
| Fuel type | petrol | petrol |
| Transmission | — | 5-speed |
| Front brakes | Expanding brake (drum brake) | Single disc |
| Rear brakes | Expanding brake (drum brake) | Single disc |
| Tires | 2.75-18 / 3-18 | 90/90-17 / 100/80-17 |
Fosti F21 vs Keeway RKS 125 E4 — which should you buy?
Picking between the Fosti F21 and the Keeway RKS 125 E4 usually comes down to the numbers you care about most. On paper, the Fosti F21 brings 10 hp in a 102 kg package, while the Keeway RKS 125 E4 counters with 11 hp at 132 kg.
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: