BMW R61 vs Ariel 4F Square Four 600 (1941)
Side-by-side spec comparison, pricing, and a plain-English breakdown of how the BMW R61stacks up against the Ariel 4F Square Four 600. Numbers pulled from manufacturer spec sheets — click either bike for the full review.
Spec comparison
| Spec | BMW R61 | Ariel 4F Square Four 600 |
|---|---|---|
| Model year | 1941 | 1936 |
| Price | — | — |
| Engine | 600 cc | 601 cc |
| Horsepower | 18 hp | 24 hp |
| Weight | — | 168 kg |
| Fuel capacity | 3.7 L | 3.5 L |
| Fuel type | petrol | petrol |
| Transmission | 4-speed | 4-speed |
| Front brakes | Expanding brake (drum brake). Single | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Tires | 3.50-19.00 / 3.50-19.00 | 3.25-19 / 3.25-19 |
BMW R61 vs Ariel 4F Square Four 600 — which should you buy?
Picking between the BMW R61 and the Ariel 4F Square Four 600 usually comes down to the numbers you care about most. On paper, the BMW R61 brings 18 hp, while the Ariel 4F Square Four 600 counters with 24 hp at 168 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: