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Rider Height
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sport / default rider 183 cm

QJ Motor SRK 421 RR vs Voge R125S ergonomics

QJ Motor SRK 421 RR and Voge R125S land within a few ergonomic points for the default rider, so the better choice comes down to posture preference and bike category.

Fit verdict

QJ Motor SRK 421 RR

90Comfortable

All contacts reached

Voge R125S

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 QJ Motor SRK 421 RR has a 795 mm seat; the Voge R125S sits at 790 mm — a 5 mm difference. As a rule of thumb you flat-foot a bike when your inseam roughly matches its seat height: about 80 cm for the QJ Motor SRK 421 RR and 79 cm for the Voge R125S.

That makes the Voge R125S the easier reach to the ground — the safer pick for shorter riders or anyone who wants both feet planted at a stop — while the QJ Motor SRK 421 RR gives taller riders more legroom and a more open knee bend. Load your own height and inseam into the simulator to see exactly how each one fits you.

Geometry snapshot

Geometry comparison for QJ Motor SRK 421 RR and Voge R125S
SpecQJ Motor SRK 421 RRVoge R125S
Seat height795 mm790 mm
Wheelbase1,385 mm1,375 mm
Wet weight185 kg141 kg
Displacement421 cc125 cc

Posture metrics

Knee angle

QJ Motor SRK 421 RR
Sport (60.7 deg)
Voge R125S
Sport (60.7 deg)

Hip angle

QJ Motor SRK 421 RR
Neutral (99.6 deg)
Voge R125S
Neutral (99.5 deg)

Elbow angle

QJ Motor SRK 421 RR
Relaxed (143.3 deg)
Voge R125S
Relaxed (143.3 deg)

Torso lean

QJ Motor SRK 421 RR
Forward (25.3 deg)
Voge R125S
Forward (25.3 deg)