The Brompton Electric G Line 4 Speed was designed as a complete system, bike and e-system built together from scratch. Rather than adapting an existing frame, Brompton's engineers started with a clean sheet, making every component work in harmony across city streets and longer mixed-terrain days out.
The result feels seamless in a way that bolt-on electric conversions simply don't. As a 20" wheel electric Brompton, the G Line rolls with more confidence than smaller-wheeled folders, and it folds down compact enough for the train, the Tube or a car boot.
- Built from the ground up , the Brompton G Line is engineered to perform in the city and comfortably beyond. For riders who want a gravel folding electric bike that handles towpaths, canal routes and light trails as well as tarmac, the G Line holds its own where most folders would struggle.
- 20" wheels , big enough to handle rough tarmac, gravel and kerbs with real confidence, yet compact enough to sit neatly within the bike's folded profile. Custom-made puncture-resistant tyres come as standard. As a 20 inch wheel folding e-bike, it bridges the gap between city folders and bigger-wheeled bikes without losing portability.
- Roller frame and mudguards , G Line mudguards and roller frame are included from the off. Full-length coverage front and rear keeps road spray away on wet British days, the lightweight roller frame gives a stable platform for carrying cargo, and those extra wheels mean the folded bike rolls rather than needs to be lugged around.
- Brompton e-Motiq system , the fine-tuned rear motor provides assist up to 15 mph for a quicker, more responsive feel on every ride. The whole powertrain was purpose-built for this bike, and it shows in how smoothly power comes in.
- Smart control , handlebar display with Adaptive Range Estimation, Start Assist, and more, all within easy reach.
- Built for real-world use , UL-certified for proven safety, with a rugged front carrier block and up to 50 miles of range. Enough for most commutes and weekend rides without worrying about the battery going flat.
- Always improving , the companion app delivers over-the-air updates and new features, so the bike keeps getting better over time.
The whole system, rear motor included, was engineered in the UK. The battery has been rigorously tested for reliability and safety, and over-the-air updates through the app mean you stay current without needing a workshop visit each time something changes.
Who is this Brompton for?
If you want one bike that folds small, rides well on mixed surfaces and handles a daily commute without complaint, the Brompton G Line UK riders have been waiting for is this one. It works as an adventure folding bike for UK weekends on gravel trails, and it works as a high-performance folding electric for getting across town on Monday morning. That kind of range, from off-road folding bike to daily commuter, is hard to find in a single package.
The Forest Green Brompton electric looks understated and smart, a green folding e-bike that suits the office bike park as well as a muddy bridleway. As a Brompton gravel e-bike, it sits in a category most folders don't even attempt, an all-terrain electric folder with proper weather protection, genuine range and a fold that still fits under your desk.
Among the best Brompton electric folding bikes available right now, the Electric G Line covers the bases that matter most to British riders: real range, proper mudguards and a compact fold.
At this price point, it's one of the most complete and well-thought-out Brompton electric folding bikes we stock.