Kawasaki Vulcan S vs Yamaha R25

The Kawasaki Vulcan S (2026) and the Yamaha R25 (2025) are compared with the same Moto Kıyas physics model under identical conditions: flat dry asphalt, no wind, a 75 kg rider and no passenger. The Kawasaki Vulcan S is a cruiser with 649 cc, 59.9 hp and unlisted weight; the Yamaha R25 is a sport bike with 250 cc, 35.4 hp and 169 kg. Power-to-weight with the rider: 226.5 hp/ton versus 145.1 hp/ton. On this measure the Kawasaki Vulcan S is 56% ahead.

In the simulation the Kawasaki Vulcan S covers 0-100 km/h (speedometer) in 4.49 s and the Yamaha R25 in 6.40 s; the Kawasaki Vulcan S is quicker by 1.92 s. In the 100-0 km/h brake test, braking distance without the 0.3 s reaction time is 44.7 m for the Kawasaki Vulcan S (with ABS) and 40.0 m for the Yamaha R25 (ABS unknown, class assumption: no ABS). The Yamaha R25 stops 4.7 m shorter. Calculated top speed: 173 km/h (estimated from power and drag) versus 158 km/h (GPS measurement).

All values are an estimated simulation, not road-test measurements. Technical data comes from the sources listed below; the model uses model-specific parameters calibrated against published road tests for both. Missing manufacturer data (weight) is estimated by class regression, not measured. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.