scooter / default rider 183 cm
Vespa ET4 150 vs Vespa PX125 ergonomics
Vespa ET4 150 and Vespa PX125 have modeled posture scores within three points for the 183 cm default rider. Treat this as a planning estimate; posture preference, data confidence, and a real test sit still matter.
Modeled fit comparison
Vespa ET4 150
All contacts reached
Vespa PX125
All contacts reached
The modeled scores are within three points, so the result does not distinguish a higher-scoring bike. Treat the result as a planning estimate and compare each bike's geometry confidence before a real test sit.
Rider fit: reaching the ground
The Vespa ET4 150 lists a 805 mm seat; the Vespa PX125 lists 810 mm — a 5 mm difference. Seat height is only a first-pass ground-reach input. It does not establish safety or actual foot contact. Seat width, suspension sag, boots, mobility, load, and individual proportions can materially change the result.
On seat height alone, the Vespa ET4 150 has the easier modeled ground reach. Load your measurements into the simulator to compare the model, then verify both motorcycles in person.
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)