moped / default rider 183 cm
Sachs MadAss 50 vs Tomos Flexer 25 SM ergonomics
Sachs MadAss 50 and Tomos Flexer 25 SM land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
Sachs MadAss 50
All contacts reached
Tomos Flexer 25 SM
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Rider fit: reaching the ground
The Sachs MadAss 50 has a 835 mm seat; the Tomos Flexer 25 SM sits at 800 mm — a 35 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 84 cm for the Sachs MadAss 50 and 80 cm for the Tomos Flexer 25 SM.
That makes the Tomos Flexer 25 SM the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the Sachs MadAss 50 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 | Sachs MadAss 50 | Tomos Flexer 25 SM |
|---|---|---|
| Seat height | 835 mm | 800 mm |
| Wheelbase | 1,235 mm | 1,115 mm |
| Wet weight | - | - |
| Displacement | 50 cc | 49 cc |
Posture metrics
Knee angle
- Sachs MadAss 50
- Sport (57.6 deg)
- Tomos Flexer 25 SM
- Sport (57.4 deg)
Hip angle
- Sachs MadAss 50
- Neutral (98.8 deg)
- Tomos Flexer 25 SM
- Neutral (101.7 deg)
Elbow angle
- Sachs MadAss 50
- Relaxed (143.3 deg)
- Tomos Flexer 25 SM
- Relaxed (143.3 deg)
Torso lean
- Sachs MadAss 50
- Neutral (8.8 deg)
- Tomos Flexer 25 SM
- Neutral (6.9 deg)