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Rider Height
<- Comparison guides

sport / default rider 183 cm

Aprilia RS 660 Factory vs BMW R 90 S ergonomics

Aprilia RS 660 Factory 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 RS 660 Factory

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.

Rider fit: reaching the ground

The Aprilia RS 660 Factory has a 820 mm seat; the BMW R 90 S sits at 820 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 Aprilia RS 660 Factory and 82 cm for the BMW R 90 S.

Geometry snapshot

Geometry comparison for Aprilia RS 660 Factory and BMW R 90 S
SpecAprilia RS 660 FactoryBMW R 90 S
Seat height820 mm820 mm
Wheelbase1,370 mm1,465 mm
Wet weight183 kg215 kg
Displacement659 cc898 cc

Posture metrics

Knee angle

Aprilia RS 660 Factory
Sport (60.7 deg)
BMW R 90 S
Sport (60.7 deg)

Hip angle

Aprilia RS 660 Factory
Neutral (99.5 deg)
BMW R 90 S
Neutral (99.5 deg)

Elbow angle

Aprilia RS 660 Factory
Relaxed (143.3 deg)
BMW R 90 S
Relaxed (143.3 deg)

Torso lean

Aprilia RS 660 Factory
Forward (25.3 deg)
BMW R 90 S
Forward (25.8 deg)