The Flyer Upstreet SL 3.10 is an urban e-bike designed for riders who want a fast, light, and fuss-free daily commuter. Its Bosch Performance Line SX motor (55 Nm, Smart System) provides smooth assistance up to 25 km/h, with a 600 W peak available when you need an extra push. At roughly 18 kg, it stays manageable for a fully equipped electric bike.
The frame is built from hydroformed aluminium, keeping the ride stiff and responsive. Up front, the FLYER Rigid Fork Carbon (12 x 100 mm) means no suspension travel — just direct, predictable handling well suited to urban roads and cycle paths. The Bosch CompactTube 400 Wh battery integrates cleanly into the downtube and removes from the side, so you can carry it indoors for charging without moving the bike. If your daily distance demands more, the optional Bosch PowerMore 250 Wh range extender clips on in bottle-cage format.
Gearing is handled by the Shimano Cues U4000 groupset — 9 speeds with an 11-46t cassette that covers everything from steep urban climbs to longer flat stretches. Stopping is taken care of by Tektro HD-R285 two-piston hydraulic disc brakes, with a 180 mm rotor up front and 160 mm at the rear, offering consistent braking regardless of conditions.
Control is via the Bosch System Controller mounted on the top tube and the Bosch Mini Remote on the handlebar — no traditional display screen included as standard. DT Swiss G 540 rims, Vittoria Terreno Zero Tan 28 x 1.75 tyres, and a carbon FLYER ONE SL cockpit with fully integrated cable routing round out a well-considered package for serious urban use.
