Brompton A Line vs C Line (2026): The 4 Differences That Actually Matter

The A Line is £999. The cheapest C Line is £1,399. Same hand-brazed steel frame, same fold, same 16-inch wheels, same factory in Greenford. So what exactly does £400 buy you?

It's the question I get asked more than any other about Bromptons, and most of the answers online are still quoting prices and gear counts that Brompton retired years ago. So here's the 2026 version: what actually separates the two bikes, who should genuinely save the money, and where the new 12-speed changes the maths entirely.

The short version

Four things separate an A Line from a C Line. Gears, mudguards, the front luggage block, and the folding pedal. Everything else — the frame, the fold, the ride, the way it disappears under a café table — is identical.

Three of those four are things you can't retrofit cheaply or at all. That's the crux of the whole decision, and it's why I end up recommending the C Line to most people even though I like the A Line a great deal.

The full comparison

	A Line 3-speed	C Line 4-speed	C Line 12-speed
Price	£999	from £1,399	from £1,599
Weight (from)	11.5kg	11.3kg	12kg
Gears	3 (hub)	4	12 (3-speed hub × 4-speed derailleur), 402% range
Frame	Steel	Steel	Steel
Wheels	16"	16"	16"
Mudguards	No	Yes	Yes
Front luggage block	No	Yes	Yes
Folding left pedal	No	Yes	Yes
Colours	White only	Full range	Full range
Warranty	7 years frame (registered)	7 years frame (registered)	7 years frame (registered)

Difference one: gears

The A Line has three hub gears. The C Line starts at four and now goes up to twelve.

Three gears is not a punishment. Millions of people have ridden three-speed hub bikes around cities perfectly happily for a century, and on flat ground the A Line's spread is genuinely fine. Bromptons are geared sensibly low anyway — you're not spinning out on a towpath.

Where three gears bites is hills, and specifically hills with a load on. A Brompton with a full front bag and a rider who isn't in the mood is a different bike to an empty one, and that's exactly the moment you want a gear you haven't got. If your commute has one proper climb in it — the kind where you're out of the saddle in the bottom gear — the A Line will make you notice it every single day.

The 4-speed C Line handles that with a fourth ratio and, more usefully, a wider spread. It's the sweet spot for most city riding: enough range for a hill, still simple, still light. At 11.3kg it's actually the lightest non-electric Brompton in the classic steel range — lighter than the A Line, which surprises people.

Brompton C Line 4-speed — the default answer

From £1,399. Four gears, mudguards, front carrier block, folding pedal, the full colour range and 11.3kg. This is the bike that most people picturing "a Brompton" are actually picturing, and it's the one I'd hand to a friend who asked without giving me any more information.

Shop at Brompton →

Difference two: mudguards

The A Line has none. The C Line has them fitted.

This sounds trivial written down and is not trivial in practice, because a mudguard-less Brompton in British weather means a wet stripe up your back and a wet stripe up your front, and the wheels are 16 inches so the spray arrives fast and low. I've ridden both in rain. The difference is the difference between arriving at a meeting and arriving at a meeting having to explain yourself.

You can add mudguards to an A Line later. Brompton sell the kit, a shop will fit it, and it works — but you're paying for parts and labour to get to where the C Line started, and you've spent an afternoon on it. If you ride anywhere that has weather, this alone eats a meaningful chunk of the £400 gap.

Difference three: the front luggage block

This is the one people underestimate, and the one I'd argue is the single strongest reason to buy a C Line.

The little block bolted to the head tube is what makes a Brompton a genuinely useful vehicle rather than a clever toy. Brompton's front bags clip onto it in a second, mount on the frame rather than the handlebars so the steering stays neutral no matter how much you've loaded in, and come off just as fast when you park. It's one of the best pieces of design on the bike — arguably better than the fold — and the A Line doesn't have it.

Which means an A Line rider carries things on their back. On a small-wheeled bike with an upright position, a heavy rucksack is exactly what you don't want: it sits high, it moves when you steer, and it makes you sweaty in a way an unloaded Brompton simply doesn't.

Yes, the block can be retrofitted too. And again, you're paying to catch up.

Difference four: the folding pedal

The C Line has a folding left pedal. The A Line has a fixed one.

The effect is on the folded package: a fixed pedal sticks out, which means the folded A Line is wider, catches on things, and shows a shin-height metal edge to everyone who walks past it on a train. The rest of the fold is identical — same shape, same one-piece parcel, same trick of standing up on its own — but the pedal is the bit that decides whether it slides neatly under a seat or wedges.

If you're folding twice a day, every day, this matters more than it reads. If you fold your bike once a fortnight to get it in the boot of a car, it barely registers.

The fifth thing, which isn't a difference so much as a fact: colour

The A Line comes in white. That's it, that's the range. The C Line comes in the proper Brompton palette — Black, Palm Green, Plum Red, Cloud Metallic and the rest.

I'm not going to pretend colour is a functional argument. But I would gently point out that this is a bike you'll keep for a decade, that it holds its value astonishingly well, and that the difference between owning something you like looking at and something you merely own is worth something. Used C Lines routinely go for £650–£920 on eBay UK. Nobody's ever told me they regretted spending a bit more on the colour.

So who should genuinely save the £400?

Plenty of people, and I don't want to talk anyone out of an A Line who fits this description:

• You live somewhere flat and mostly dry. No hills, no downpours, no need for mudguards you'll actually notice.
• Your rides are short. Two miles to the station is a three-gear distance.
• You barely carry anything. A laptop and a sandwich in a small rucksack is fine. A weekly shop is not.
• The bike lives folded most of the time. Under a desk, in a hallway, in a flat with no storage. The A Line is the same brilliant fold for £400 less.
• £1,399 is genuinely out of reach and £999 isn't. This is the honest one. An A Line you own beats a C Line you're still saving for, and it is a real Brompton — same frame, same seven-year frame warranty when you register it, same everything that makes the thing special.

That last point deserves saying plainly, because there's a bit of snobbery about the A Line that I have no time for. It isn't a stripped-out cynical thing. It's a Brompton with the extras taken off, made in the same place by the same people, and it rides identically.

And the case for stretching

Here's the arithmetic that changes minds. Add mudguards and a front luggage block to an A Line after the fact and you've spent parts money plus fitting on two features the C Line ships with — and you still have the fixed pedal, three gears and a white bike.

Add the resale side: Bromptons hold value better than almost anything else with two wheels, and the C Line is the model the used market wants. Spread across the years you'll own it, the real gap between the two bikes is much smaller than £400.

And there's the boring, unglamorous truth about bikes generally, which is that the ones people actually ride are the ones with nothing standing in the way. Rain? Mudguards. Shopping? Front bag. Hill? Fourth gear. Every friction you remove is a day you ride instead of not riding. That's what the £400 is buying — not features, fewer excuses.

Where the 12-speed changes the answer

Brompton retired the 6-speed in 2025 and replaced it with a 12-speed built on a new rear frame — a 3-speed hub multiplied by a 4-speed derailleur, giving 402% of gear range. That's a serious spread, comparable to a proper touring setup, on a bike that folds into a bag.

Brompton C Line 12-speed — for hills, loads and longer days

From £1,599, rising to around £1,819 depending on colour. 12kg — the heaviest of the three bikes here, and you feel that 700g when you carry it up stairs. But 402% of range means there is no hill in a British city that will beat you, loaded or not.

Who it's for: hilly commutes, riders who carry real weight, anyone planning to do more than commute on it. Who it isn't for: flat-city riders who carry the bike more than they climb on it, where the extra weight is a daily cost and the extra gears are an occasional benefit.

Shop at Brompton →

Here's why the 12-speed matters to the A Line question specifically. If gearing is the reason you're leaning towards a C Line, the 4-speed may not be enough of a jump to be worth the money, and the honest comparison is £999 against £1,599. That's a £600 gap, not £400 — and at that point you should be asking a different question, which is whether you want a Brompton with all the gears or a lighter Brompton with fewer. I've written about the C Line versus the P Line separately, because if you're already stretching, that's the next question up.

The A Line, if that's where you've landed

£999. Three hub gears, 11.5kg, white, no mudguards, no front block, fixed pedals — and the same steel frame, same fold, same seven-year registered frame warranty as every other bike here.

See the A Line at Brompton — £999 →

Two things worth doing before you spend anything

First: try one properly. Brompton run a subscription — the C Line from £35/month on a 12-month term, or £50/month rolling with 30 days' notice — which includes theft and damage insurance, delivery and an annual service after six months. It is not a cheap way to own a Brompton and I wouldn't pretend otherwise, but it is a very good way to find out whether you'll actually use one before committing four figures. Worth reading how the subscription stacks up against buying first, including the small print about the insurance being void if you leave it locked up unattended.

Second: be honest about whether you want a Brompton at all rather than a cheaper folder. I've made the full case either way, and it isn't a foregone conclusion — Brompton sold 78,530 bikes in FY2025, down 7.5% on the year before, on a £2.1m net loss. They aren't invincible and the price isn't nothing. If the fold, the luggage system and the resale value don't matter to you, there are better-value bikes.

If the ladder keeps going

Above the C Line sits the P Line, from £2,479 with the roller frame, at 10kg — a titanium rear frame and fork taking roughly 1.5kg off the C Line. That's a lot of money per kilo, and it's only worth it if you carry the bike often and far. And above that, the electric range starts at £2,999 for the Electric C Line, with the new e-Motiq rear hub motor.

I mention them only so you know the shape of the range. Nobody choosing between £999 and £1,399 needs to be thinking about £2,999. But it's useful to know that the C Line isn't the ceiling — it's the middle, and it's the middle for a reason.

If you enjoy the history behind all this, the story of how Brompton got here — via a rather important rival — is worth an hour: the Bickerton and Brompton story.

The verdict

Buy the C Line 4-speed. For most people, most of the time, £1,399 is the right amount of money to spend on a Brompton — you get the mudguards, the front luggage block and the folding pedal, all of which are things you'd otherwise pay to add later, plus a fourth gear and a bike that isn't white. At 11.3kg it's also the lightest of the three.

Buy the A Line at £999 if your riding is short, flat, dry and light, or if £1,399 simply isn't happening. It's a proper Brompton and you'll be pleased with it.

Buy the C Line 12-speed at £1,599 if you have hills or carry weight — the 402% range is transformative and the 700g penalty is worth paying. And if you're stretching that far anyway, read the P Line comparison before you commit.

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