Description
Brompton C Line 12-Speed
The Brompton C Line 12-speed is the ultimate city companion, blending iconic British craftsmanship with cutting-edge portability. Proudly handmade in London since 1975, our bikes transform from a full-sized ride into a compact, locked package in under 20 seconds. Whether navigating bustling streets, hopping on a train, or tucking it under a café table, the C Line is designed to move with you effortlessly. Now featuring a new 12-speed system, it delivers an impressive gear range—matching, if not exceeding, traditional road and commuter bikes—all while maintaining Brompton’s renowned compact design. The Advance Rear Frame takes portability even further, allowing riders to glide and steer their folded bike with ease, thanks to larger, smoother-rolling wheels.
Personalisation has always been at the heart of Brompton, and the C Line 12-speed continues this tradition with three striking new colours: the bold Flamingo Pink, the sophisticated Amethyst Lacquer, and the classic Turkish Green. Its unique Brompton Luggage System ensures a stable ride, even when carrying heavy loads, by keeping weight on the frame rather than the handlebars. Whether you’re commuting, adventuring, or simply enjoying the ride, the C Line 12-speed is a versatile, stylish, and practical bike that redefines urban mobility.
The original folding bike
C Line is the original steel folding bike built for the city. Proudly handmade in London since 1975. It transforms from a go-anywhere vehicle to a small, locked package in under 20 seconds. Easy to lift, carry or store. You can take it on trains, tuck it in car boots or under restaurant tables. Add luggage, run a rack, and even store a toolkit inside the frame.
New 12-speed system
The latest development is the C Line 12-speed, brought in to accompany the 2 and 6-speed options. First seen on the P Line model, Brompton’s unique 12-speed system is an expertly engineered solution that gives riders more gears and more range. It takes portability of Brompton’s classic bike to a whole new level, thanks to an Advance Rear Frame which allows owners to glide and steer their folded bikes through railway stations and entrance foyers with the seat post locked halfway up.
Carry everything you need
From your laptop to labradoodle. The unique Brompton Luggage System places the weight on your frame instead of the handlebars. So, when carrying loads, your ride remains brilliantly stable.
Key Details
12 Speed – Do even more. All the range of – and sometimes even more than a road, hybrid, commuter or city bike, all with the convenience of the compact Brompton package.
New Advance Rear Frame
The most portable C Line ever – you can now steer and glide with you seat post locked halfway. New bigger, better Roller Wheels go from street to building with ease.
Exclusive new colors
Amethyst Lacquer, Flamingo Pink and Turkish Green are new color options exclusive to C Line 12 Speed
The most compact folding bike
From a go-anywhere bike into a small, locked package in under 20-seconds. Everything folds, even the pedal.
Super portable
Lift, carry and store. Or fold halfway to tow, roll or glide. Like a small suitcase, your Brompton moves through the day easily – everything connects.
Ride low, mid or high
With handlebar options that mimic the feeling of road bikes, hybrids and cruisers.
Specifications:
Weight
From 26.4 lb
Speed
12-speed
Material
Steel
Folded Size
25.3″ H x 23” W x 10.6” D
Main Frame
Precision drawn heat-treated steel tubing with hand brazing and selected auto-brazed joints
Rear Frame
Brompton Advance Rear Frame
Fork
Steel brazed fork
Grips
Lock-on grips with soft-compound rubber adhered to an engineered core
Seatpost
Standard, Black (33″)
Saddle
Standard
Seatclamp
Composite seat clamp and rear frame clip
Hinge Clamps
Composite hinge clamp levers
Pedals
Brompton folding left pedal
Drivetrain
Brompton 12-speed drivetrain, 402% range
Chainset
6061 forged aluminum crank with 50T chainring and integrated chainguard
Bottom Bracket
Square taper bottom bracket
Headset
Brompton headset
Shifters
Brompton 4 speed derailleur shifter & 3 speed hub gear shifter
Sprockets
11-18 Tooth
Derailleur
Patent-pending direct mount 4-speed derailleur
Rear Wheel
Double wall rim, 28 spoke, Brompton Wide ratio 3 speed internal gear hub
Front Wheel
Double-wall rim, 28 spokes laced to a Brompton front hub
Tires
349 x 35C Schwalbe Marathon Racer. A puncture resistant tire with a reflective sidewall
Tubes
Schrader valve
Fenders
Included
Lighting
Reflectors
Roller Wheels
Advance Roller Wheels
Rack
Not included
Brakes
Brompton Dual Pivot Calipers
Front Carrier
Front carrier block adaptor for all types of Brompton luggage
Disclaimer
* Specifications are subject to change without notice
Sizing & Geometry:
Brompton Folding Bike Sizing
All Bromptons come with a standard frame size, with bike fit adjusted by seatpost length and handlebar rise (or stem length for G-Line models). Traditional Brompton handlebars are available in low, mid, and high options, allowing you to choose between a more aggressive or relaxed riding position.
Available in Low MId or High Bar variants
G-Line bikes are sized S, M, and L, with seatpost and stem lengths tailored to suit different rider heights. For more details on finding the right fit, see the size tables below.
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WARNING: This product contains chemicals known to the State of California to cause cancer reproductive harm
The products in this store may expose you to chemicals such as Nickel which are known in the state of California to cause cancer, and Bisphenol A (BPA) which is known to the state of California to cause birth defects or other reproductive harm.
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