Information

Brompton G Line – Roller Frame, 4-Speed

Wheel Size

• 20″ wheels (front and rear)

Frame & Material

• Steel main frame, hand-brazed
• Rear frame: Steel
• Fork: Aluminium with mounting bosses

Gears / Drivetrain

• Uses Brompton’s 4-speed drivetrain (163% gear range).
• Shifter: MicroSHIFT
• Chainring: 50T
• Good range for climbing + flat riding, works well with the e‑assist system.

Motor / Battery / Range

• Electric assist system: Brompton’s e‑Motiq.
• Battery: 345 Wh, with LED readout.
• Charging: Full charge in ~4 hours with included 2A charger.
• Range: 20–45 miles (≈ 30–60 km) per charge.

Sizes

• Available in Small, Medium, Large sizes
• Each size has a different stem length + seatpost height — designed with a bike-fitting expert.

Seatpost Options

Standard Seatpost

• Best for riders up to ~175 cm
• Lightest option
• Ideal if extra height is not needed

Extended Seatpost

• Best for riders 175–185 cm
• Adds extra saddle height
• Simple and durable

Telescopic Seatpost

• Best for riders 185–200+ cm
• Two-stage post allows significant extra height
• Still folds compact for travel bags

Brakes

• Hydraulic disc brakes (Tektro)

Folded Size

• Depth: 72 cm (28.3″)
• Height: 67 cm (26.2″)
• Width: 41 cm (16″)

Accessories / Standard Add-Ons

• Mudguards / Fenders: Included – keeps clothes clean in wet conditions
• Roller Rack: Included – allows the folded bike to roll smoothly like luggage
• Front Carrier Block: Large-diameter adaptor for Brompton bags
• Lighting: AVY Integrated lighting system included.

Handlebars

• Wide handlebars for excellent stability and control
• Comes with a handlebar-mounted display / control system (e-Motiq) for power mode, adaptive range, start assist.

Weight

• From 14.8 kg (EU spec)

Intended Use / Strengths

• Designed for multi-terrain use — city, travel, and rougher paths
• Feels closer to a full-size bike thanks to 20″ wheels and updated geometry
• Roller rack, disc brakes, and strong hub make it practical for commuting and touring

This Brompton bike is a custom-build product.
To complete your purchase, please contact our team via live chat, email, or phone so we can configure the bike to your exact needs. Custom assembly typically takes 4–7 weeks.
We may also have pre-assembled models in stock for you to view or test ride—please get in touch to check availability.