supermoto / default rider 183 cm
KTM 390 SMC R vs Yamaha XT125X ergonomics
KTM 390 SMC R and Yamaha XT125X land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
KTM 390 SMC R
All contacts reached
Yamaha XT125X
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Rider fit: reaching the ground
The KTM 390 SMC R has a 835 mm seat; the Yamaha XT125X sits at 830 mm — a 5 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 84 cm for the KTM 390 SMC R and 83 cm for the Yamaha XT125X.
That makes the Yamaha XT125X the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the KTM 390 SMC R 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 | KTM 390 SMC R | Yamaha XT125X |
|---|---|---|
| Seat height | 835 mm | 830 mm |
| Wheelbase | 1,357 mm | 1,335 mm |
| Wet weight | - | - |
| Displacement | 399 cc | 124 cc |
Posture metrics
Knee angle
- KTM 390 SMC R
- Sport (57.8 deg)
- Yamaha XT125X
- Sport (57.8 deg)
Hip angle
- KTM 390 SMC R
- Neutral (96.1 deg)
- Yamaha XT125X
- Neutral (96.5 deg)
Elbow angle
- KTM 390 SMC R
- Relaxed (143.3 deg)
- Yamaha XT125X
- Relaxed (143.3 deg)
Torso lean
- KTM 390 SMC R
- Neutral (10.6 deg)
- Yamaha XT125X
- Neutral (10.3 deg)