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Rider Height
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standard / default rider 183 cm

Triumph Speed Twin 900 vs Yamaha XS400 ergonomics

Triumph Speed Twin 900 and Yamaha XS400 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

Triumph Speed Twin 900

Modeled scoreProvisional
95Comfortable

All contacts reached

Yamaha XS400

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 Triumph Speed Twin 900 lists a 780 mm seat; the Yamaha XS400 lists 780 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 Triumph Speed Twin 900 and Yamaha XS400
SpecTriumph Speed Twin 900Yamaha XS400
Seat height780 mm780 mm
Wheelbase1,449 mm1,364 mm
Wet weight216 kg182 kg
Displacement900 cc391 cc

Posture metrics

Knee angle

Triumph Speed Twin 900
Sport (58.0 deg)
Yamaha XS400
Sport (57.9 deg)

Hip angle

Triumph Speed Twin 900
Neutral (94.2 deg)
Yamaha XS400
Neutral (95.8 deg)

Elbow angle

Triumph Speed Twin 900
Relaxed (143.3 deg)
Yamaha XS400
Relaxed (143.3 deg)

Torso lean

Triumph Speed Twin 900
Neutral (12.0 deg)
Yamaha XS400
Neutral (10.8 deg)