Expertly engineered to go where others can’t. G Line is the first ever Brompton with the ride feel of a full-size bike. Brand-new geometry, 20” wheels, game-changing comfort and capability. All holistically designed around the fold that made us famous. It's your one-bike solution to the city and beyond.
 
G Line. The most versatile bike in the world.  
The all-new one-bike solution for the city and beyond.Big on ride feel and compact in size.
You can ride G Line anywhere and take it everywhere.
Happily delivering on all sorts of surfaces. Confident in all conditions. Comfortable hour after hour. G Line is expertly engineered to give you everything you need for the rough, the smooth and the beautiful.
 
You can run a rack, mudguards, and bags, add water
bottles, and even store your toolkit inside the frame.
And with the original Brompton fold, the ever-ready G Line transforms into a compact, locked package in under 20 seconds. Goes on trains. Travels in car boots. Stores in small spaces (including one-person tents).
 
In a world full of possibilities, G Line is your one-bike route to everywhere.
 
 
G Line Brompton 8 Speed 2025 Bike (With Roller Frame)
Weight
From 14.8 kg
 
Speed
8-speed
 
Material
Steel
 
Folded Size
28.3" / 72cm (D), 26.2" / 67cm (H), 16" / 41cm (W)
 
Main Frame
Hand-brazed steel main frame
 
Rear Frame
Steel
 
Fork
Aluminium fork with mounting bosses
 
Grips
Ergonomic grips
 
Seatpost
Small - Standard Black, Medium - Extended Black, Large - Telescopic Black
 
Saddle
Superlight
 
Seatclamp
G Line Aluminium
 
Hinge Clamps
Self-aligning hinge clamps
 
Pedals
Wide Platform Quick Release
 
Drivetrain
Brompton 8-sspeed drivetrain
 
Number of gears
8 gears
 
Chainset
54T
 
Headset
Brompton headset
 
Shifters
Microshift
 
Derailleur
Shimano Alfine Hub System
 
Rear Wheel
20"
 
Front Wheel
20"
 
Tyres
Schwalbe G-One All Round 54-406. Tan wall
 
Mudguards
Included
 
Lighting
Reflectors
 
Pump
Not included
 
Rack
Included
 
Brakes
Tektro Hydraulic Disc brakes with 140mm Rotor
 
Front Carrier
Large diameter front carrier block adaptor for all types of Brompton luggage
 
On Bike Accessories
Not included
 
G Line Go For Light Bundle
 
Weight
From 1 kg
 
Contents
Be Seen Lights for G Line, G Line Puncture Pouch & Borough Waterproof Roll Top Bag Small
 
Modes
Light - High/Low/Flash/Pulse/Strobe
 
Run time
Light - High: 2 hours, Low: 5 hours, Flash: 10 hours (200ms/300ms), Pulse: 25 hours, Strobe:10 hours
 
Recharge Time
Light - 1.5 hours to full
 
Charger
Light - Micro USB, 5V 1A. Charging cable not included. We’re making conscious decisions to minimise waste and this fitting is commonplace in most homes
 
IP_Rating
Light - IP65 (dust and water jet tight)
 
Operating Temps
Light - Charge :0°C ~ +50°C, Discharge: -10°C ~ +60°C
 
Front Light Compatibility
Light - Compatible with all Brompton folding bikes apart from A Line and bikes with pre 2017 brake levers
 
Rear Light Compatibility
Light - Compatible with all Brompton saddles with the light recess underneath
 
Capacity
Bottle - 600 ml, Bag - 9L
 
Main Material
Bottle - BPA-free Polypropylene, Bag - Durable TPU coated nylon fabric RF welded waterproof construction fully lined
 
Dimensions
Bottle - 100 x 100 x 200 mm, Bag - w30 x h28 x d11 (cm)
 
To Install
Bottle - 4 mm hex key torque wrench
 
Compatibility
Bottle - G Line or any bike with bottle boss screw threaded holes, Bag - Compatible with ALL non-electric Brompton handlebars
 
Lining Material
Bag - 100% Nylon
 
Fitment
Bag - Front Carrier Block
 
Waterproof
Bag - Yes
 
Straps
Bag - Easy to carry with a detachable shoulder strap and handle
 
Output
Light - Front - 26 lumens, Rear - 11 lumens.