What Is the Brompton C Line?
The Brompton C Line is the classic full-size folding bike from Brompton Bicycle, hand-built in London since 1975. It comes in two drivetrain options — 4-speed and 12-speed — giving you a choice between simplicity and range. All C Line bikes share the same legendary steel frame, 16-inch wheels, and world-famous compact fold.
Simply put: this is the world’s most compact folding bike, designed for people who live in apartments, take trains, or need a bike that disappears under a desk.
Two Models: 4-Speed vs 12-Speed
The C Line lineup is refreshingly simple:
| C Line 4-Speed | C Line 12-Speed | |
|---|---|---|
| Gears | 4-speed hub | 4-speed hub × 3-speed derailleur |
| Weight | From 11.3 kg | From 12.0 kg |
| Best for | Flat cities, short commutes | Hilly cities, longer rides |
| Price (UK) | From £1,399 | From £1,599 |
| Price (US) | ~$1,700 | ~$1,950 |
Our pick: The 12-speed is worth the extra £200. That 302% gear range means you’ll never wish for a different bike on a hill — and resale value is stronger.
Why Choose the Brompton C Line?
1. The World’s Most Compact Fold
Brompton’s patented 3-part fold is unmatched. In under 20 seconds, the bike collapses to 58.5 × 56.5 × 27 cm — small enough to fit in an overhead luggage rack, under a restaurant table, or inside a shopping cart. No other folding bike gets this small this fast.
2. 4-Speed or 12-Speed — Your Call
The 4-speed uses a sealed internal gear hub — zero maintenance, dead reliable, perfect for flat commutes. The 12-speed adds a 3-speed derailleur for 302% gear range, covering everything from San Francisco hills to weekend countryside trips.
3. Three Handlebar Choices (Low / Mid / High)
Brompton simplified their bar naming. Low (previously S-type) sits 40mm lower for a sporty, aggressive stance. Mid (previously M-type) is the balanced all-rounder. High (previously H-type) gives the most upright, comfortable position.
4. Built Like a Tank — Hand-Brazed Steel
Every C Line frame is hand-brazed in London. The steel construction absorbs road vibration better than aluminum — important on 16-inch wheels — and the frames last decades. Brompton backs this with a 7-year warranty.
5. Customise Exactly How You Want
Pick your colour (10+ options from classic Black to Amethyst Lacquer), handlebar (Low/Mid/High), mudguards (yes/no), and rack (yes/no). Every C Line is built to order. The rear rack option also lets you roll the folded bike like a shopping cart — a killer feature for commuters.
Brompton C Line Full Specifications
| Spec | Value |
|---|---|
| Weight | 11.3–12.0 kg (25–26.5 lbs) |
| Folded Size | 58.5 × 56.5 × 27 cm |
| Wheel Size | 16-inch (349 mm) |
| Gears | 4-speed hub / 12-speed (hub + derailleur) |
| Frame Material | Hand-brazed steel |
| Handlebar | Low / Mid / High |
| Brakes | Dual-pivot caliper (front & rear) |
| Suspension | Rear suspension block |
| Tires | Schwalbe Marathon Racer 35mm |
| Max Load | 110 kg (242 lbs) |
| Price | £1,399–£1,599 ($1,700–$1,950 USD) |
| Warranty | 7-year frame warranty |
Pros & Cons
Pros
- Smallest fold of any production bike
- 20-second fold/unfold
- 12-speed option covers all terrain
- Hand-built steel frame lasts decades
- Rolls when folded (shopping cart mode)
- 10+ colour choices, custom built
- 7-year frame warranty
- Huge accessory ecosystem
- Strong resale value (60%+ after 5 years)
Cons
- Expensive (from £1,399 / ~$1,700)
- Heavier than some competitors
- 16-inch wheels = rougher ride on bad pavement
- Steel frame needs care (rust risk in wet climates)
- No disc brakes (caliper only)
- Custom parts = expensive repairs
Where to Buy
Brompton bikes are sold through authorized dealers worldwide. You can configure and order directly from Brompton’s website, or find select models on Amazon.
Final Verdict
The Brompton C Line is the gold standard for city folding bikes. Wirecutter selected it as their upgrade pick, noting it “comes close to a full-size bike experience on the road” while offering the most compact fold available. No other bike folds smaller, and few are built with this level of craftsmanship.
The 4-speed is the practical choice for flat cities. The 12-speed is the pick if you have hills or want maximum versatility. Either way, a Brompton holds its value — buy one today and sell it in 5 years, you’ll get back over 60% of what you paid. That’s unheard of for bicycles.
Rating: 4.7/5 — Best-in-class fold, legendary durability, two solid drivetrain options.
Disclosure: As an Amazon Associate, we earn from qualifying purchases. We are not affiliated with or endorsed by Brompton Bicycle Ltd. All trademarks belong to their respective owners.