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Rider Height
<- Comparison guides

moped / default rider 183 cm

Vespa LX50 vs Yamaha Sirius FI ergonomics

Vespa LX50 and Yamaha Sirius FI land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.

Fit verdict

Vespa LX50

95Comfortable

All contacts reached

Yamaha Sirius FI

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 Vespa LX50 has a 775 mm seat; the Yamaha Sirius FI sits at 775 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 78 cm for the Vespa LX50 and 78 cm for the Yamaha Sirius FI.

Geometry snapshot

Geometry comparison for Vespa LX50 and Yamaha Sirius FI
SpecVespa LX50Yamaha Sirius FI
Seat height775 mm775 mm
Wheelbase1,280 mm1,235 mm
Wet weight102 kg98 kg
Displacement49 cc113 cc

Posture metrics

Knee angle

Vespa LX50
Sport (57.7 deg)
Yamaha Sirius FI
Sport (57.6 deg)

Hip angle

Vespa LX50
Neutral (97.7 deg)
Yamaha Sirius FI
Neutral (98.8 deg)

Elbow angle

Vespa LX50
Relaxed (143.3 deg)
Yamaha Sirius FI
Relaxed (143.3 deg)

Torso lean

Vespa LX50
Neutral (9.5 deg)
Yamaha Sirius FI
Neutral (8.8 deg)