moped / default rider 183 cm
TVS Motor Rockz 125 vs Vespa ET4 50 ergonomics
TVS Motor Rockz 125 and Vespa ET4 50 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
TVS Motor Rockz 125
All contacts reached
Vespa ET4 50
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 TVS Motor Rockz 125 lists a 780 mm seat; the Vespa ET4 50 lists 780 mm, within a few millimetres of each other. 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.
Geometry snapshot
| Spec | TVS Motor Rockz 125 | Vespa ET4 50 |
|---|---|---|
| Seat height | 780 mm | 780 mm |
| Wheelbase | 1,260 mm | 1,280 mm |
| Wet weight | 106 kg | - |
| Displacement | 125 cc | 50 cc |
Posture metrics
Knee angle
- TVS Motor Rockz 125
- Sport (57.7 deg)
- Vespa ET4 50
- Sport (57.7 deg)
Hip angle
- TVS Motor Rockz 125
- Neutral (98.1 deg)
- Vespa ET4 50
- Neutral (97.7 deg)
Elbow angle
- TVS Motor Rockz 125
- Relaxed (143.3 deg)
- Vespa ET4 50
- Relaxed (143.3 deg)
Torso lean
- TVS Motor Rockz 125
- Neutral (9.2 deg)
- Vespa ET4 50
- Neutral (9.5 deg)