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Rider Height
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sport / default rider 183 cm

Aprilia RS4 125 vs BMW R 90 S ergonomics

Aprilia RS4 125 and BMW R 90 S land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.

Fit verdict

Aprilia RS4 125

90Comfortable

All contacts reached

BMW R 90 S

90Comfortable

All contacts reached

The two bikes are close enough that posture preference matters more than the overall score.

Geometry snapshot

Geometry comparison for Aprilia RS4 125 and BMW R 90 S
SpecAprilia RS4 125BMW R 90 S
Seat height820 mm820 mm
Wheelbase1,353 mm1,465 mm
Wet weight144 kg215 kg
Displacement124 cc898 cc

Posture metrics

Knee angle

Aprilia RS4 125
Sport (60.7 deg)
BMW R 90 S
Sport (60.7 deg)

Hip angle

Aprilia RS4 125
Neutral (99.6 deg)
BMW R 90 S
Neutral (99.5 deg)

Elbow angle

Aprilia RS4 125
Relaxed (143.3 deg)
BMW R 90 S
Relaxed (143.3 deg)

Torso lean

Aprilia RS4 125
Forward (25.2 deg)
BMW R 90 S
Forward (25.8 deg)