Yamaha R25 vs Yamaha Sirius FI

The Yamaha R25 (2025) and the Yamaha Sirius FI (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 Yamaha R25 is a sport bike with 250 cc, 35.4 hp and 169 kg; the Yamaha Sirius FI is a cub / underbone with 114 cc, 8.6 hp and 98 kg. Power-to-weight with the rider: 145.1 hp/ton versus 49.6 hp/ton. On this measure the Yamaha R25 is 193% ahead.

0-100 km/h (speedometer): Yamaha R25 6.40 s, Yamaha Sirius FI not reached (top simulated speed 89 km/h). In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 14.4 m for the Yamaha R25 (ABS unknown, class assumption: no ABS) and 18.5 m for the Yamaha Sirius FI (ABS unknown, class assumption: no ABS). The Yamaha R25 stops 4.1 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 158 km/h (GPS measurement) versus 88 km/h (estimated from power and drag).

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 the Yamaha R25 and class-average calibration (no accepted model-specific road test) for the Yamaha Sirius FI. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.