moped / default rider 183 cm
Yamaha Janus vs Yamaha Zuma 50F ergonomics
Yamaha Janus and Yamaha Zuma 50F 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
Yamaha Janus
All contacts reached
Yamaha Zuma 50F
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 Yamaha Janus lists a 770 mm seat; the Yamaha Zuma 50F lists 770 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 | Yamaha Janus | Yamaha Zuma 50F |
|---|---|---|
| Seat height | 770 mm | 770 mm |
| Wheelbase | 1,260 mm | 1,280 mm |
| Wet weight | 97 kg | 93 kg |
| Displacement | 125 cc | 49 cc |
Posture metrics
Knee angle
- Yamaha Janus
- Sport (57.7 deg)
- Yamaha Zuma 50F
- Sport (57.7 deg)
Hip angle
- Yamaha Janus
- Neutral (98.1 deg)
- Yamaha Zuma 50F
- Neutral (97.7 deg)
Elbow angle
- Yamaha Janus
- Relaxed (143.3 deg)
- Yamaha Zuma 50F
- Relaxed (143.3 deg)
Torso lean
- Yamaha Janus
- Neutral (9.2 deg)
- Yamaha Zuma 50F
- Neutral (9.5 deg)