cafe-racer / default rider 183 cm
BMW R100S vs BMW R90S ergonomics
BMW R100S and BMW R90S land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.
Fit verdict
BMW R100S
95Comfortable
All contacts reached
BMW R90S
95Comfortable
All contacts reached
The two bikes are close enough that posture preference matters more than the overall score.
Rider fit: reaching the ground
The BMW R100S has a 820 mm seat; the BMW R90S sits at 818 mm, within a few millimetres of each other. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 82 cm for the BMW R100S and 82 cm for the BMW R90S.
Geometry snapshot
| Spec | BMW R100S | BMW R90S |
|---|---|---|
| Seat height | 820 mm | 818 mm |
| Wheelbase | 1,466 mm | 1,466 mm |
| Wet weight | 220 kg | 215 kg |
| Displacement | 980 cc | 898 cc |
Posture metrics
Knee angle
- BMW R100S
- Sport (58.1 deg)
- BMW R90S
- Sport (58.1 deg)
Hip angle
- BMW R100S
- Neutral (93.6 deg)
- BMW R90S
- Neutral (93.6 deg)
Elbow angle
- BMW R100S
- Relaxed (143.3 deg)
- BMW R90S
- Relaxed (143.3 deg)
Torso lean
- BMW R100S
- Neutral (12.3 deg)
- BMW R90S
- Neutral (12.3 deg)