moped / default rider 183 cm
Piaggio Liberty 50 2T vs Yamaha Sirius FI ergonomics
Piaggio Liberty 50 2T 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 2T
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.
Rider fit: reaching the ground
The Piaggio Liberty 50 2T has a 775 mm seat; the Yamaha Sirius FI sits at 775 mm, within a few millimetres of each other. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 78 cm for the Piaggio Liberty 50 2T and 78 cm for the Yamaha Sirius FI.
Geometry snapshot
| Spec | Piaggio Liberty 50 2T | 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 2T
- Sport (57.8 deg)
- Yamaha Sirius FI
- Sport (57.6 deg)
Hip angle
- Piaggio Liberty 50 2T
- Neutral (96.6 deg)
- Yamaha Sirius FI
- Neutral (98.8 deg)
Elbow angle
- Piaggio Liberty 50 2T
- Relaxed (143.3 deg)
- Yamaha Sirius FI
- Relaxed (143.3 deg)
Torso lean
- Piaggio Liberty 50 2T
- Neutral (10.3 deg)
- Yamaha Sirius FI
- Neutral (8.8 deg)