moped / default rider 183 cm
Yamaha LB 70 Chappy vs Yamaha QT50 Yamahopper ergonomics
Yamaha LB 70 Chappy and Yamaha QT50 Yamahopper land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
Yamaha LB 70 Chappy
All contacts reached
Yamaha QT50 Yamahopper
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Rider fit: reaching the ground
The Yamaha LB 70 Chappy has a 710 mm seat; the Yamaha QT50 Yamahopper sits at 695 mm — a 15 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 71 cm for the Yamaha LB 70 Chappy and 70 cm for the Yamaha QT50 Yamahopper.
That makes the Yamaha QT50 Yamahopper the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the Yamaha LB 70 Chappy gives taller riders more legroom and a more open knee bend. Load your own height and inseam into the simulator to see exactly how each one fits you.
Geometry snapshot
| Spec | Yamaha LB 70 Chappy | Yamaha QT50 Yamahopper |
|---|---|---|
| Seat height | 710 mm | 695 mm |
| Wheelbase | 1,050 mm | 1,050 mm |
| Wet weight | - | - |
| Displacement | 65 cc | 49 cc |
Posture metrics
Knee angle
- Yamaha LB 70 Chappy
- Sport (57.3 deg)
- Yamaha QT50 Yamahopper
- Sport (57.3 deg)
Hip angle
- Yamaha LB 70 Chappy
- Neutral (103.1 deg)
- Yamaha QT50 Yamahopper
- Neutral (103.1 deg)
Elbow angle
- Yamaha LB 70 Chappy
- Relaxed (143.3 deg)
- Yamaha QT50 Yamahopper
- Relaxed (143.3 deg)
Torso lean
- Yamaha LB 70 Chappy
- Neutral (5.9 deg)
- Yamaha QT50 Yamahopper
- Neutral (5.9 deg)