Description
Brompton G Line with Roller Frame 8-Speed Folding Bike
The Brompton G Line with Roller Frame 8-Speed is a versatile folding bike designed to combine the comfort and capability of a full-size bicycle with the convenience of Brompton’s compact folding design. Built around a hand-brazed steel frame, 20-inch wheels and wider handlebars, the G Line offers a more stable, confident ride across city streets, gravel paths and everyday adventures. With an 8-speed Shimano Alfine hub gear system, hydraulic disc brakes and wide Schwalbe G-One Allround tyres, it’s designed for riders who want one bike that can handle commuting, leisure riding and exploring beyond the tarmac.
Unlike traditional smaller-wheeled Brompton models, the G Line uses larger 20-inch wheels and revised frame geometry to deliver a ride feel closer to a conventional bicycle. Its integrated Roller Frame makes moving the folded bike more convenient, while the familiar Brompton folding mechanism transforms it into a compact package in under 20 seconds. Whether you’re combining cycling with train travel, navigating busy streets or heading out along a canal towpath, the Brompton G Line offers everyday practicality without limiting where you can ride.
Key Specifications
- Frame: Hand-brazed steel main frame with steel rear frame
- Fork: Aluminium with mounting bosses
- Wheel Size: 20 inch
- Gearing: Shimano Alfine 8-speed internal hub gear system
- Gear Range: 307%
- Shifter: Microshift
- Chainset: 54T
- Brakes: Tektro hydraulic disc brakes with 140 mm rotors
- Tyres: Schwalbe G-One Allround 54-406 tanwall
- Handlebars: Wide Brompton G Line handlebars
- Grips: Ergonomic
- Saddle: Brompton Superlight
- Pedals: Wide platform with quick-release left pedal
- Rear Equipment: Roller Frame with rack and mudguards
- Front Carrier: Brompton luggage-compatible front carrier block adaptor
- Folded Dimensions: 72 cm deep x 67 cm high x 41 cm wide
- Weight: From 14.8 kg
- Available Sizes: Small, Medium and Large
- Seatpost: Standard on Small, Extended on Medium and Telescopic on Large
- Lighting: Reflectors included
- Recommended Use: Urban commuting, leisure cycling, gravel paths and mixed-surface adventures
20-Inch Wheels for a More Confident Ride
The Brompton G Line introduces 20-inch wheels, making it the first Brompton designed to deliver the ride feel of a full-size bicycle. Compared with the smaller wheels found on traditional Brompton folding bikes, the larger wheel platform and revised geometry provide a more stable, balanced riding experience across a wider variety of surfaces. The G Line is designed for everything from smooth city roads to gravel tracks, towpaths and well-maintained off-road routes, making it a practical choice for cyclists who want to explore beyond their daily commute.
Shimano Alfine 8-Speed Hub Gearing
The G Line features a Shimano Alfine 8-speed internal hub gear system with a 307% gear range. This provides a useful spread of gears for everyday cycling, allowing riders to tackle hills, maintain a comfortable cadence on flatter roads and adapt to changing terrain. With the gearing mechanism enclosed within the rear hub, the system is also well suited to regular commuting and year-round use. A Microshift shifter provides straightforward gear selection.
Hydraulic Disc Brakes for All-Weather Control
Unlike traditional Brompton models equipped with rim brakes, the G Line features Tektro hydraulic disc brakes with 140 mm rotors. These provide controlled, consistent braking in a range of riding conditions, including wet roads and mixed surfaces. Hydraulic braking also reduces the hand effort needed to apply the brakes, helping maintain confidence when navigating busy streets, descending hills or riding in changeable British weather.
Schwalbe G-One Allround Tyres for Mixed Surfaces
The Brompton G Line is equipped with Schwalbe G-One Allround 54-406 tyres, providing a wider contact patch and a tread pattern suited to both paved roads and light off-road riding. Their generous width helps improve comfort and traction on uneven surfaces, making the G Line suitable for gravel paths, canal towpaths and everyday urban routes. The tanwall finish also gives the bike a distinctive appearance.
Compact Folding Design with Roller Frame
Despite its larger wheels and more capable riding platform, the G Line retains the folding convenience that makes Brompton bikes so practical. The bike folds into a compact, locked package in under 20 seconds, with folded dimensions of approximately 72 x 67 x 41 cm. This makes it easier to store at home, transport in a car boot or take on public transport, subject to operator restrictions.
The Roller Frame adds practicality when moving the bike in its folded position, helping reduce the need to carry its full weight over suitable smooth surfaces. It’s particularly useful for riders navigating railway stations, offices and other locations where cycling isn’t possible.
Comfortable Geometry and Wide Handlebars
The G Line features geometry developed to provide a balanced, comfortable riding position across a wider range of terrain. Its wider handlebars offer additional leverage and steering control, particularly when riding on rougher surfaces or climbing hills. Ergonomic grips and a comfortable saddle complete the contact points, making the bike suitable for longer leisure rides as well as shorter everyday journeys.
Practical Features for Everyday Cycling
The Brompton G Line is designed to accommodate a variety of everyday cycling accessories. Included mudguards help reduce road spray, while the rear rack and Roller Frame add carrying and transport convenience. The front carrier adaptor is compatible with Brompton’s luggage mounting system, allowing riders to attach suitable bags for commuting or leisure use. The aluminium fork also features mounting bosses for compatible accessories, providing additional flexibility for longer adventures.
Brompton G Line Sizing
The Brompton G Line is available in Small, Medium and Large sizes. Rather than using three completely different frame sizes, Brompton adjusts the stem and seatpost configuration to suit different rider heights and provide a comfortable riding position. Small models feature a standard seatpost, Medium models use an extended seatpost and Large models feature a telescopic seatpost. Choosing the correct size is important for achieving a comfortable reach to the handlebars and an appropriate saddle height.
Who Is the Brompton G Line with Roller Frame For?
The Brompton G Line with Roller Frame 8-Speed is ideal for cyclists who want the practicality of a folding bike without restricting their riding to smooth urban roads. Its larger wheels, wide tyres, hydraulic disc brakes and comfortable geometry make it particularly appealing to commuters, leisure cyclists and riders who enjoy exploring gravel paths and mixed surfaces. The folding design and Roller Frame also make it a practical option for anyone combining cycling with train travel or needing a bike that can be stored in a smaller space.
Bike specifications are advised by the manufacturer and can be subject to change without prior warning.
Please call our helpful sales team on 01539 821 443 or email us for the latest up-to-date product information.
