The Flyer Upstreet SL 3.10 is an electric city bike built around one idea: making daily rides as effortless as possible without adding bulk. The hydroformed aluminium frame with full internal cable routing keeps the lines clean and houses the Bosch CompactTube 400 Wh battery, which slides out from the side for straightforward charging. The Bosch Performance Line SX motor (55 Nm, 250 W, up to 25 km/h assist) provides smooth, responsive support — enough to take on urban gradients without breaking a sweat.
The Shimano Cues U4000 9-speed drivetrain (11-46t) covers a broad gear range, handy for both climbing and maintaining a comfortable pace on flat stretches. Tektro HD-R285 hydraulic brakes with 2-piston calipers and 180/160 mm rotors offer reliable, modulated stopping power regardless of conditions. DT Swiss G 540 rims paired with Vittoria Terreno Zero tyres (28 x 1.75") round out a well-matched rolling package.
Instead of a traditional display, the Bosch System Controller mounted on the top tube shows key ride data, while a wireless Mini Remote on the bars lets you switch assistance modes with your thumb — no need to take your hands off the handlebar. The FLYER ONE Carbon cockpit contributes to keeping the total weight around 18 kg, which makes a real difference when lifting the bike into a car boot or carrying it up to your flat. A 100-lux headlight with automatic daytime running light, a FLYER steel rack (up to 15 kg), Curana mudguards and a Hebie IC kickstand are all included as standard.
For longer rides, the optional Bosch PowerMore 250 Wh Range Extender can boost the battery capacity. The Upstreet SL 3.10 is available in Frosty Sage Gloss in sizes S, M, L and XL.
