About the Brompton G Line
Nothing feels like G Line – the entirely new frame built around larger 20" wheels, with the widest ever handlebars and tyres on a Brompton. Everything is thoughtfully engineered to give the balanced feel of a full-size bike and all-day comfort that’s nothing short of joyous. You’ll feel the difference on every ride.
Big on ride feel, compact in size - The G Line is created to be the best one-bike solution for the city and beyond. It rides like a full-sized bike, yet it transforms into a compact package that stores and travels easily. So you can go anywhere.
The most capable Brompton ever - Rigorously tested over 250,000 km, G Line goes where others can’t. Now, you can confidently tackle everything from dusty single track to rain-soaked cobbles. Built tough with disc brake stopping power, this bike does it all with ease.
Extended Warranty
Brompton offers an extended 7-year frame warranty, 3-year electrical system warranty on Brompton Electric bikes, and a 2-year warranty on all other non-wearing parts. Simply visit the Brompton website to register with your frame number.
Key Features
- 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
Frameset
- Frame: Precision drawn heat-treated steel tubing with hand brazing and selected auto-brazed joints
- Rear Frame: Hand brazed cold-formed micro-alloy steel tubing
- Fork: Aluminium with mounting bosses
- Stem: Aluminium with mounting bosses
Wheels
- Front Wheel: 20" Double-wall rim laced to Alloy Disc Hub with 12mm bolt-through axle
- Rear Wheel: 20" Double-wall rim laced to a Shimano 8 speed Internal Hub with a 307% gear range.
- Tyres: Schwalbe G-One Tan-wall 20" x 2.10 (54-406)
- Mudguards: New 20" Mudguards with improved rubberized flap
Drivetrain
- Pedals: Brompton Quick Release Wide Platform
- Crank: (6061) forged aluminium crank with 54T chainring and integrated chainguard
- Chain Tensioner: Designed to deal with the large variations in chain whilst being folded and unfolded.
- Shifters: 8 Speed rapid fire shifter
- Bottom Bracket: Square taper bottom bracket
Components
- Handlebar: (6061) aluminium handlebar, 660mm length, 31.8mm clamp
- Grips: Ergonomic Lock-on grips with textured soft-compound rubber adhered to an engineered core
- Headset: Brompton headset
- Brakes: Tektro Hydraulic Disc Brakes, 140mm Rotors F&R
- Saddle: Brompton Superlight saddle with integrated carry handle (147mm). Incorporates a mount for a Brompton rear light and saddle bag.
- Seatpost: Chromoly steel tube, centreless ground, chrome plated for hardness, delivered in a standard length (small), Extended Length (Medium) & Telescopic (Large).
- Roller Frame Rack: New G Line specific rack. Perfect for rolling your bike around when folded thanks to the new super smooth roller wheels, and pairing with the new Rack Bag
Brompton G Line Sizing
| S | M | L | |
|---|---|---|---|
| Rider Height (cm) | 152 - 168 | 168 - 183 | 183 - 198 |
| Rider Height (in) | 5'0 -5'6 | 5'6- 6'0 | 6'0 - 6'6 |
Product code: 930112
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