Honda SH125i vs Yamaha R25

The Honda SH125i (2025) 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 Honda SH125i is a scooter with 125 cc, 12.9 hp and 138 kg; the Yamaha R25 is a sport bike with 250 cc, 35.4 hp and 169 kg. Power-to-weight with the rider: 60.4 hp/ton versus 145.1 hp/ton. On this measure the Yamaha R25 is 140% ahead.

In the simulation the Honda SH125i covers 0-100 km/h (speedometer) in 19.13 s and the Yamaha R25 in 6.40 s; the Yamaha R25 is quicker by 12.73 s. In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 16.3 m for the Honda SH125i (with ABS) and 14.4 m for the Yamaha R25 (ABS unknown, class assumption: no ABS). The Yamaha R25 stops 1.9 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 97 km/h (manufacturer claim) 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. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.