moped / default rider 183 cm
Piaggio Liberty 50 vs Yamaha Sirius FI ergonomics
Piaggio Liberty 50 and Yamaha Sirius FI land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
Piaggio Liberty 50
95Comfortable
All contacts reached
Yamaha Sirius FI
95Comfortable
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Geometry snapshot
| Spec | Piaggio Liberty 50 | Yamaha Sirius FI |
|---|---|---|
| Seat height | 775 mm | 775 mm |
| Wheelbase | 1,330 mm | 1,235 mm |
| Wet weight | - | 98 kg |
| Displacement | 49 cc | 113 cc |
Posture metrics
Knee angle
- Piaggio Liberty 50
- Sport (57.8 deg)
- Yamaha Sirius FI
- Sport (57.6 deg)
Hip angle
- Piaggio Liberty 50
- Neutral (96.6 deg)
- Yamaha Sirius FI
- Neutral (98.8 deg)
Elbow angle
- Piaggio Liberty 50
- Relaxed (143.3 deg)
- Yamaha Sirius FI
- Relaxed (143.3 deg)
Torso lean
- Piaggio Liberty 50
- Neutral (10.3 deg)
- Yamaha Sirius FI
- Neutral (8.8 deg)