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G Line / 8-Speed
We have one C Line (12 speed, Mid size in Dune Sand color,) and one G Line (8 speed, Medium size in Adventure Orange color) to view and test ride at the store. All bikes need to be ordered, and take roughly 7-10 days to arrive.
Pairs well with

G Line / 8-Speed
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, fenders, 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.

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.
Built on fifty years of expertise, Brompton bikes are made for real life and a long life. G Line's production is a labour of love, with each steel frame handmade and quality assured in our London Factory.
With our 7-year frame warranty, you can ride with peace of mind.

Larger 20" wheels
Big enough for any adventure yet compact enough to fit inside the fold. The G Line's solidly built 20" wheelset comes equipped with custom-made puncture-resistant tires.
And if you're looking for even more off-road performance and protection, they are tubeless-ready whenever you are.

The most capable Brompton ever
Rigorously tested over 250,000 km, first to meet industry standards, then to meet ours, G Line goes where others can’t. Now, you can confidently tackle everything from dusty singletrack to rain-soaked cobbles. This bike does it all with ease.

Big on ride feel, compact in size
We created G Line to be the best one-bike solution for the city and beyond, and then we made it a Brompton. The frame geometry is comparable to a full size bike, yet it transforms into a compact package that stores and travels easily. So you can go anywhere.

G Line sizes
G Line comes in three easy-to-choose sizes based on your height. Small, medium or large. The single-size frame has varying stem and seatpost heights, developed and tested with a world-leading bike fit expert for the best ride experience.
Specifications
Weight
From 32.63 lb
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-speed drivetrain
Number of Gears
8 gears
Chainset
54T
Headset
Brompton headset
Shifters
Microshift
Derailleur
Shimano Alfine Hub System
Rear Wheel
20"
Front Wheel
20"
Tires
Schwalbe G-One All Round 54-406. Tan wall
Fenders
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
FAQs
Can I test ride a G Line?
Yes! We have an Adventure Orange Medium model in the shop for you to test ride!
What terrain can I ride G Line on?
It’s the most capable Brompton yet, with the ability to deliver on all sorts of surfaces, including: gravel paths, tow paths, asphalt and well maintained off-road routes. With the feel of a full-size bike.
How many gears does G Line have?
The G line has 8 gears with a 307% gear ratio/range. It has a Shimano Alfine 8-speed hub gear.
What is the warranty of G Line?
The frame comes with a 7-year warranty once registered.
What is the reach of each size?
- The small has a reach of 474mm
- The medium has a reach of 481mm
- The large has a reach of 502mm
How do I park my G Line?
The G Line supports itself when in park mode. Simply flip the rear wheel under and see the magic.
Does G Line luggage fit on my C, P, T Line Front Carrier Block?
Yes, all our bags use the same mounting system on the front of the bike.
Does G Line come with lighting?
There is an option to buy the bike with lights or without lights.
Does it come with Dynamo?
No.