moped / default rider 183 cm
Suzuki Birdie 50 vs Yamaha LB 70 Chappy ergonomics
Suzuki Birdie 50 and Yamaha LB 70 Chappy 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
Suzuki Birdie 50
All contacts reached
Yamaha LB 70 Chappy
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 Suzuki Birdie 50 lists a 705 mm seat; the Yamaha LB 70 Chappy lists 710 mm — a 5 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 Suzuki Birdie 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 | Suzuki Birdie 50 | Yamaha LB 70 Chappy |
|---|---|---|
| Seat height | 705 mm | 710 mm |
| Wheelbase | 1,175 mm | 1,050 mm |
| Wet weight | - | - |
| Displacement | 49 cc | 65 cc |
Posture metrics
Knee angle
- Suzuki Birdie 50
- Sport (57.5 deg)
- Yamaha LB 70 Chappy
- Sport (57.3 deg)
Hip angle
- Suzuki Birdie 50
- Neutral (100.3 deg)
- Yamaha LB 70 Chappy
- Neutral (103.1 deg)
Elbow angle
- Suzuki Birdie 50
- Relaxed (143.3 deg)
- Yamaha LB 70 Chappy
- Relaxed (143.3 deg)
Torso lean
- Suzuki Birdie 50
- Neutral (7.9 deg)
- Yamaha LB 70 Chappy
- Neutral (5.9 deg)