Harley-Davidson Street Bob vs Yamaha NMAX 125

The Harley-Davidson Street Bob (2025) and the Yamaha NMAX 125 (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 Harley-Davidson Street Bob is a cruiser with 1,923 cc, 91.2 hp and 293 kg; the Yamaha NMAX 125 is a scooter with 125 cc, 12.1 hp and 132 kg. Power-to-weight with the rider: 247.8 hp/ton versus 58.3 hp/ton. On this measure the Harley-Davidson Street Bob is 325% ahead.

In the simulation the Harley-Davidson Street Bob covers 0-100 km/h (speedometer) in 3.49 s and the Yamaha NMAX 125 in 20.34 s; the Harley-Davidson Street Bob is quicker by 16.84 s. In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 17.7 m for the Harley-Davidson Street Bob (ABS unknown, class assumption: no ABS) and 17.9 m for the Yamaha NMAX 125 (ABS unknown, class assumption: no ABS). The Harley-Davidson Street Bob stops 0.2 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 194 km/h (estimated from power and drag) versus 99 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 class-average calibration (no accepted model-specific road test) for the Harley-Davidson Street Bob and model-specific parameters calibrated against published road tests for the Yamaha NMAX 125. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.