supermoto / default rider 183 cm
GasGas SM 125 Halley vs Yamaha WR125X ergonomics
GasGas SM 125 Halley and Yamaha WR125X land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
GasGas SM 125 Halley
All contacts reached
Yamaha WR125X
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Rider fit: reaching the ground
The GasGas SM 125 Halley has a 945 mm seat; the Yamaha WR125X sits at 920 mm — a 25 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 95 cm for the GasGas SM 125 Halley and 92 cm for the Yamaha WR125X.
That makes the Yamaha WR125X the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the GasGas SM 125 Halley gives taller riders more legroom and a more open knee bend. Load your own height and inseam into the simulator to see exactly how each one fits you.
Geometry snapshot
| Spec | GasGas SM 125 Halley | Yamaha WR125X |
|---|---|---|
| Seat height | 945 mm | 920 mm |
| Wheelbase | 1,460 mm | 1,430 mm |
| Wet weight | - | 137 kg |
| Displacement | 124 cc | 125 cc |
Posture metrics
Knee angle
- GasGas SM 125 Halley
- Sport (58.1 deg)
- Yamaha WR125X
- Sport (58.0 deg)
Hip angle
- GasGas SM 125 Halley
- Neutral (93.7 deg)
- Yamaha WR125X
- Neutral (94.4 deg)
Elbow angle
- GasGas SM 125 Halley
- Relaxed (143.3 deg)
- Yamaha WR125X
- Relaxed (143.3 deg)
Torso lean
- GasGas SM 125 Halley
- Neutral (12.2 deg)
- Yamaha WR125X
- Neutral (11.8 deg)