Brompton C Line 4-Speed - Mid Handlebar - Folding Bike

About the Brompton C Line 4-Speed – Mid Handlebar

The original Brompton folding bike — now available with a 4-speed option. With a robust steel frame, proudly handmade in London. The C Line remains one of Brompton’s most accessible and versatile models.

C Line is the original steel folding bike built for urban life. Proudly handmade in London since 1975, it transforms in under 20 seconds from a rideable bike to a compact, locked package. Easy to lift, carry or store. You can take it on trains, fit it in car boots or tuck it under restaurant tables. Add luggage, mount a rack, or store a small toolkit inside the frame.

The latest development is the C Line 4-Speed, offering more gearing flexibility than the 2-speed variant while retaining portability and foldability. It uses a derailleur-based system with inline sprockets and leverages Brompton’s classic design for compactness and ease of use in urban settings.

Extended Warranty

Brompton offers a 7-year frame warranty and a 2-year warranty on all other non-wearing parts. Registration via the Brompton website with your frame number is required.

Key Features

• Mid handlebar for a natural, relaxed riding position.

Specifications

Frameset

• Frame: Precision drawn, heat-treated steel tubing with hand-brazed joints (Brompton C Line construction).



• Rear Frame: Steel rear frame designed to work with the derailleur/inline sprocket system.



• Fork: Steel brazed fork.

Wheels

• Front Wheel: Double-wall rim, 28 spokes.



• Rear Wheel: Double wall rim, 28 spoke, Brompton Wide ratio 2-speed internal gear hub.



• Rims: Alloy.



• Tyres: 349 x 35C Schwalbe Marathon Racer - puncture-resistant with reflective sidewall.



• Mudguards: Full mudguards included.



• Roller Wheels: 66 mm roller wheels for rolling the folded bike.

Drivetrain

• Pedals: Brompton folding left-hand and non-folding right-hand pedals.



• Crank: 6061 forged aluminium crank with integrated chainguard.



• Derailleur: Brompton Chain pusher



• Chain Tensioner: Designed to maintain chain tension during folding and unfolding.



• Shifters: Brompton 2 and 3-speed Trigger shifters



• Bottom Bracket: Square taper bottom bracket.

Components

• Handlebar: 6061 aluminium mid handlebar (shot-peened finish).



• Grips: Lock-on grips with soft-compound rubber on an engineered core.



• Headset: Brompton headset.



• Brakes: Brompton dual-pivot caliper rim brakes.



• Brake Levers: Brompton brake levers.



• Saddle: Brompton saddle with integrated carry handle; mount for rear light and saddle bag.



• Seatpost: Chromoly steel tube, centreless ground and chrome plated; supplied in standard length (suitable for typical inside-leg ranges).

Product code: 931676