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