A full-size ride, perfectly compact

The Brompton G Line is the ultimate all-in-one bike — engineered for the city and beyond. Its full-sized frame geometry delivers confident, responsive handling, while Brompton’s renowned folding design transforms it into a sleek, compact package that travels anywhere with ease.

Engineered for every journey

Tested over 250,000 km to exceed even the most demanding standards, the G Line is built to perform where others can’t. From dusty trails to rain-soaked cobbles, it glides across every surface with precision and poise.

Comfort, elevated

Featuring Brompton’s widest-ever handlebars and tyres, the G Line blends mountain bike stability with all-day comfort. Every detail has been meticulously refined to create a smooth, balanced, and effortlessly joyful ride.

Tailored fit

Available in three optimised sizes:-

Small (Standard Seatpost with Small stem)

Medium (Extended Seatpost with Medium stem)

Large (Telescopic Seatpost with Large Stem)

The G Line adapts perfectly to your height and riding style. Developed with world-leading bike fit experts, it ensures a truly personalised experience on every ride.

Features

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.

The most versatile bike in the world
Expertly engineered to go where others can’t. G Line is the first ever Brompton with the ride feel of a full-size bike

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 tyres.

Hydraulic disc brakes
Super dependable stopping power. The first ever Brompton to come equipped with disc brakes for all terrain, all-weather riding.

Wide platform pedals
The grippiest, most comfortable Brompton pedal set. The left hand pedal can be released with a quick squeeze and pull to make your folded bike even more 

Wide handlebars
Stay in control. With the custom made handlebars, G Line gives you exceptional stability – from leverage on uphills and rough ground to comfort on longer rides.

Ergonomic grips
Every touchpoint between you and the bike is designed with comfort and control in mind.

•  Weight - From 14.8 kg
• Folded Size - 28.3" / 72cm (D), 26.2" / 67cm (H), 16" / 41cm (W)
• Hinge Clamps - Self-aligning hinge clamps
• Seatpost: Each G Line size comes with a different seatpost to accommodate the rider's leg length.
• Small: Uses a standard seatpost, recommended for inside leg measurements up to 33 inches (84 cm).
• Medium: Comes with an extended seatpost, which is 60 mm longer than the standard and suitable for inside leg measurements between 33 and 35 inches (84–89 cm).
• Large: Features a telescopic seatpost, which is necessary for taller riders and minimizes the length of the folded package. It is recommended for riders with an inside leg measurement over 35 inches (89 cm).
• Stem: The stem—the component connecting the handlebars to the fork—is also a specific length for each size to optimize the bike's "reach" (the horizontal distance from the pedals to the handlebars). This ensures the correct riding position for different heights.
• Ride feel: These size adjustments allow the G Line to provide a full-size bike feel, with the Large providing the most upright position.
• Folded size: While the G Line overall is larger than traditional Brompton models due to its 20-inch wheels, the use of different seatposts and stems affects the folded package. The telescopic seatpost on the Large model helps reduce how far the seatpost protrudes, keeping the folded dimensions as compact as possible for a taller rider.