moped / default rider 183 cm
Sachs MadAss 50 vs Yamaha Y15ZR ergonomics
Sachs MadAss 50 and Yamaha Y15ZR 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
Sachs MadAss 50
All contacts reached
Yamaha Y15ZR
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 Sachs MadAss 50 lists a 835 mm seat; the Yamaha Y15ZR lists 845 mm — a 10 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 Sachs MadAss 50 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 | Sachs MadAss 50 | Yamaha Y15ZR |
|---|---|---|
| Seat height | 835 mm | 845 mm |
| Wheelbase | 1,235 mm | 1,290 mm |
| Wet weight | - | - |
| Displacement | 50 cc | 150 cc |
Posture metrics
Knee angle
- Sachs MadAss 50
- Sport (57.6 deg)
- Yamaha Y15ZR
- Sport (57.7 deg)
Hip angle
- Sachs MadAss 50
- Neutral (98.8 deg)
- Yamaha Y15ZR
- Neutral (97.6 deg)
Elbow angle
- Sachs MadAss 50
- Relaxed (143.3 deg)
- Yamaha Y15ZR
- Relaxed (143.3 deg)
Torso lean
- Sachs MadAss 50
- Neutral (8.8 deg)
- Yamaha Y15ZR
- Neutral (9.6 deg)