scooter / default rider 183 cm
Vespa ET4 150 vs Vespa PX125 ergonomics
Vespa ET4 150 and Vespa PX125 land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
Vespa ET4 150
All contacts reached
Vespa PX125
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Rider fit: reaching the ground
The Vespa ET4 150 has a 805 mm seat; the Vespa PX125 sits at 810 mm — a 5 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 81 cm for the Vespa ET4 150 and 81 cm for the Vespa PX125.
That makes the Vespa ET4 150 the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the Vespa PX125 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 | Vespa ET4 150 | Vespa PX125 |
|---|---|---|
| Seat height | 805 mm | 810 mm |
| Wheelbase | 1,280 mm | 1,260 mm |
| Wet weight | - | 101 kg |
| Displacement | 150 cc | 123 cc |
Posture metrics
Knee angle
- Vespa ET4 150
- Sport (57.7 deg)
- Vespa PX125
- Sport (57.7 deg)
Hip angle
- Vespa ET4 150
- Neutral (97.7 deg)
- Vespa PX125
- Neutral (98.1 deg)
Elbow angle
- Vespa ET4 150
- Relaxed (143.3 deg)
- Vespa PX125
- Relaxed (143.3 deg)
Torso lean
- Vespa ET4 150
- Neutral (9.5 deg)
- Vespa PX125
- Neutral (9.2 deg)