Brompton T Line 4 Speed (with Front Carrier Block) 2026 - Folding Bike
The Brompton T Line 4 Speed sets a new benchmark for urban mobility, combining cutting-edge materials with the practicality Brompton are famous for. At the heart of the bike is a Grade 9 titanium frame, welded for strength and engineered to be 37% lighter than equivalent steel frames. The advanced rear triangle integrates a replaceable hanger, suspension block and 54mm roller wheels for easy manoeuvring when folded.
Key Features:
- Grade 9 titanium frame with fast 20s folding system
- One-piece carbon fork with steerer and pedal holder
- Brompton 4-speed drivetrain for smooth city riding
- Dual pivot calliper brakes for controlled stopping
- 16” wheels with Schwalbe ONE tyres & puncture protection
- Flat handlebar for agile urban handling
- Front carrier block included for luggage options
- Available with 0% APR finance
Up front, the carbon fork and steerer keep weight down while adding stiffness for responsive handling. A magnetic pedal holder ensures neatness when folded, further enhancing portability. With its ultra-compact fold, the bike transitions from road-ready to carry-friendly in just 20 seconds, making it ideal for commuters hopping between trains, buses and offices.
The 4-speed drivetrain is carefully optimised for city riding, offering the right balance of acceleration, cruising efficiency, and climbing capability. Whether tackling short hills or navigating stop-start traffic, gear shifts are smooth and intuitive, keeping you in control. A superlight carbon crank set with a 50T chainring and chainguard delivers reliable power transfer, while the FSA Mega Evo bottom bracket adds long-lasting efficiency.
Braking comes courtesy of dual pivot callipers, providing consistent stopping performance in all conditions. Rolling on 16” lightweight rims with double-butted spokes and aluminium hubs, the bike is fitted with Schwalbe ONE tyres that are fast, grippy, and armed with V-Guard puncture protection to keep flats at bay.
Finishing touches include a superlight seat post and saddle for all-day comfort, along with CNC aluminium pedals, one fixed and one quick release for a compact fold. The flat handlebar gives a direct, agile ride feel, perfect for weaving through busy streets. With the front carrier block fitted, you can expand your carrying capacity using Brompton’s dedicated luggage range from work bags to travel packs.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Grade 9 titanium tubes, welded main frame with cast titanium bottom bracket manifold. Advance Superlight rear frame with replaceable hanger, suspension block and 54mm roller wheels |
| Fork | One piece carbon fork and steerer with magnetic pedal holder |
| Headset | Grade 9 titanium diameter tubes with integrated headset and spring loaded steerer catch hinge |
| Front Brake | Dual Pivot Calipers |
| Rear Brake | Dual Pivot Calipers |
| Rear Mech | Brompton 1-speed drivetrain |
| Speed | 1 |
| Rims | Lightweight rim, double butted |
| Front Hub | aluminium hub with sealed bearings and allen key axle |
| Rear Hub | Superlight Advance 1-speed wheel - Lightweight rim, double-butted spokes and aluminium hub body |
| Spokes | double-butted spokes |
| Front Tyre | Schwalbe ONE with Addix Race rubber mix and V-Guard puncture protection |
| Rear Tyre | Schwalbe ONE with Addix Race rubber mix and V-Guard puncture protection |
| Seat Post | Superlight standard seatpost (33") |
| Saddle | Superlight |
| Chainset | Superlight carbon crankset with hollow BB30 axle, integrated spider, 50T chainring and chainguard |
| Bottom Bracket | FSA Mega Evo Bottom Bracket |
| Cassette | 12 tooth |
| Pedals | Superlight cnc aluminium pedal set with Fixed right-hand and quick-release left-hand pedals |
Brompton Folding Bike Size Guide
All Brompton bikes have the same size frame and with the standard seatpost fitted are suitable for riders with an inside leg measurement up to 84cm or 33".
Longer seatposts are available for those with inside leg measurements over 84cm.
|
Seatpost |
Inside Leg (Centimetres) |
Inside Leg (inches) |
|
Standard |
Up to 84 |
Up to 33” |
|
Extended |
84 - 89 |
33” – 35” |
|
Telescopic |
Over 89 |
Over 35” |
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Brompton T Line 4 Speed (with Front Carrier Block) 2026 - Folding Bike
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