motocross / default rider 183 cm
KTM 520 SX Racing vs Yamaha YZ125 ergonomics
KTM 520 SX Racing and Yamaha YZ125 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 520 SX Racing
All contacts reached
Yamaha YZ125
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 520 SX Racing has a 925 mm seat; the Yamaha YZ125 sits at 935 mm — a 10 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 93 cm for the KTM 520 SX Racing and 94 cm for the Yamaha YZ125.
That makes the KTM 520 SX Racing the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the Yamaha YZ125 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 520 SX Racing | Yamaha YZ125 |
|---|---|---|
| Seat height | 925 mm | 935 mm |
| Wheelbase | 1,481 mm | 1,450 mm |
| Wet weight | - | - |
| Displacement | 510 cc | 123 cc |
Posture metrics
Knee angle
- KTM 520 SX Racing
- Sport (58.1 deg)
- Yamaha YZ125
- Sport (58.1 deg)
Hip angle
- KTM 520 SX Racing
- Neutral (93.4 deg)
- Yamaha YZ125
- Neutral (94.0 deg)
Elbow angle
- KTM 520 SX Racing
- Relaxed (143.3 deg)
- Yamaha YZ125
- Relaxed (143.3 deg)
Torso lean
- KTM 520 SX Racing
- Neutral (12.5 deg)
- Yamaha YZ125
- Neutral (12.0 deg)