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Rider Height
<- Comparison guides

cafe-racer / default rider 183 cm

BMW R90S vs Kawasaki Z1-R ergonomics

BMW R90S and Kawasaki Z1-R have modeled posture scores within three points for the 183 cm default rider. Treat this as a planning estimate; posture preference, data confidence, and a real test sit still matter.

Modeled fit comparison

BMW R90S

Modeled scoreProvisional
95Comfortable

All contacts reached

Kawasaki Z1-R

Modeled scoreProvisional
95Comfortable

All contacts reached

The modeled scores are within three points, so the result does not distinguish a higher-scoring bike. Treat the result as a planning estimate and compare each bike's geometry confidence before a real test sit.

Rider fit: reaching the ground

The BMW R90S lists a 818 mm seat; the Kawasaki Z1-R lists 815 mm, within a few millimetres of each other. Seat height is only a first-pass ground-reach input. It does not establish safety or actual foot contact. Seat width, suspension sag, boots, mobility, load, and individual proportions can materially change the result.

Geometry snapshot

Geometry comparison for BMW R90S and Kawasaki Z1-R
SpecBMW R90SKawasaki Z1-R
Seat height818 mm815 mm
Wheelbase1,466 mm1,505 mm
Wet weight215 kg-
Displacement898 cc1,015 cc

Posture metrics

Knee angle

BMW R90S
Sport (58.1 deg)
Kawasaki Z1-R
Sport (58.2 deg)

Hip angle

BMW R90S
Neutral (93.6 deg)
Kawasaki Z1-R
Neutral (92.8 deg)

Elbow angle

BMW R90S
Relaxed (143.3 deg)
Kawasaki Z1-R
Relaxed (143.3 deg)

Torso lean

BMW R90S
Neutral (12.3 deg)
Kawasaki Z1-R
Neutral (12.8 deg)