The Brompton Electric G Line 4 Speed brings a new level of refinement to the world’s most iconic folding bike. Now with 345Wh battery and new Handlebar Control

Key Features:

Hand-brazed steel frame with compact Brompton geometry
Aluminium fork with integrated mounting points
4-speed Brompton drivetrain for versatile gearing
Tektro hydraulic disc brakes with 160/140mm rotors
20” Brompton rims with Schwalbe G-One Allround tyres
Quick-fold roller frame for easy transport and storage

Drive Information:

Motor: 250W brushless rear hub motor, 30Nm torque
Battery: 345Wh removable battery, 4-hour full charge
User Interface: Handlebar and Battery display with integrated mode control
At the heart of the G Line is Brompton’s all-new UK-developed electric system. The compact 250W rear hub motor delivers smooth, reliable assistance up to 25km/h, paired with a torque-sensing bottom bracket for intuitive power delivery. The 345Wh battery, housed in a sleek removable bag, provides a practical range for daily rides and recharges in around four hours. The new handlebar controller and display makes it easy to toggle between power modes on the go, and future-ready connectivity allows firmware updates and integration with Brompton’s smartphone app. Range is 20-45 miles (30-60km)

The G Line’s geometry mirrors that of a full-sized bike, ensuring comfort on longer rides while remaining compact when folded. Wide, ergonomic handlebars offer stable handling, while the new in-house designed Brompton saddle supports a natural riding position suited to electric assistance. Hydraulic TRP/Tektro disc brakes deliver powerful, predictable braking in all weather conditions, a first for Brompton, and the 20” wheels fitted with Schwalbe G-One Allround tyres balance rolling efficiency with grip across tarmac, gravel, and mixed surfaces.

Designed for riders who go everywhere, the G Line includes practical touches such as mounting points for mudguards, racks, and bottle cages, along with clever in-frame storage for the optional G Line toolkit. Available in three size options; small, medium, and large. The G Line adapts perfectly to a wide range of riders and styles.

Weight From 19.5kg including battery (Medium size 19.71kg. 16.1kg bike +3.61kg battery)
Speed - 4 Speed 
Material - Steel frame and rear triangle. Aluminium fork and stem.
Folded Size - from: 28.3" / 72cm (D), 26.2" / 67cm (H), 16" / 41cm (W)

Handlebar - Aluminium 650mm Low Rise Black
Grips - Lock-on Ergonomic grips
Seatpost -  Small - Standard Black, Medium - Extended Black, Large - Telescopic Black
Saddle - Standard Wide
Seatclamp - G Line Aluminium
Hinge Clamps - Self aligning hinge clamps
Pedals - Wide Platform Quick Release left hand
Drivetrain - 4 inline sprockets (11T/13T/15T/18T sprockets, 50T Chainring) 163% range.
Chainset - 6061 forged aluminium crank with 50T chainring and integrated chainguard
Bottom Bracket - Integrated sealed bearing BB with cadence and torque sensor
Headset - Brompton headset, Sealed Bearings
Shifters - Brompton 4 speed trigger shifter
Derailleur - Brompton 4 Speed
Rear Wheel - 20" 250W Motor providing up to 15.5mph. 6 Bolt 160mm Rotor
Front Wheel - 20" Through Axle. Centre Lock 140mm Rotor
Tyres - Schwalbe G One tyres with Tan Wall (ETRTO size 54-406) - tubeless ready
Tubes - Presta valve
Mudguards - Included
Lighting - Lezyne E115 front light Busch and Muller rear light powered by the main battery
Pump - None
Rack - Included
Brakes - TRP/Tektro Hydraulic disc brakes
Controller - E-Motiq Handlebar Controller
Battery - 345wh with LED display. 4-hour full charge using included 2A charger
Range - 20-45 miles (30-60km)
Luggage - Essentials bag with 1.5L storage. 
Connectivity - Brompton Electric iOS and Android apps available for download