Brompton T Line 4 Speed 2025 - Folding Bike
The Brompton T Line 4 Speed represents the pinnacle of urban folding bike design – precision-engineered with a grade 9 titanium main frame that’s both incredibly light and seriously strong. Weighing 37% less than a standard steel Brompton, the T Line is easier to carry upstairs, onto trains, or across town when folded – making it the go-to option for busy commuters or space-conscious riders.
Key Features:
- Grade 9 titanium frame with Brompton’s signature 3-part folding mechanism
- One-piece carbon fork and steerer with integrated pedal holder
- 4-speed Brompton derailleur and trigger shifter with wide urban gearing
- Dual-pivot caliper brakes front and rear
- 16" wheels with Schwalbe ONE tyres and V-Guard protection
- Low-rise titanium handlebar for agile, compact handling
- Folds in 20 seconds and weighs 37% less than steel models
- Available with 0% APR finance
Brompton’s trademark 3-part fold takes just 20 seconds and tucks the bike into a compact, portable package that fits easily under desks or in luggage racks. The Advance Superlight rear triangle, carbon fork and carbon crankset further trim down weight while maintaining durability and ride quality.
The bike runs a 4-speed derailleur system, unique to Brompton and engineered for the T Line to be compact, efficient and simple to operate. With a well-balanced range, it’s ideal for stop-start city riding, gentle inclines and cruising through the streets. The trigger shifter offers crisp control on the go, while the 11-18T cassette keeps you in the right gear for the terrain.
Braking is handled by dual-pivot callipers, offering reliable stopping power, while 16” lightweight wheels wrapped in Schwalbe ONE tyres deliver a fast, responsive feel with Addix Race rubber compound and V-Guard puncture protection for added reassurance.
A carbon saddle, titanium seatpost, and CNC-machined aluminium pedals complete this meticulously crafted build, with a magnetic pedal holder keeping things neat when folded. Whether you’re commuting, travelling or just riding for fun, the Brompton T Line 4 Speed is your gateway to fast, fluid and stylish city cycling.
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 | Patent pending direct mount 4-speed derailleur |
| Shifters | 4-speed trigger shifter |
| Speed | 4 |
| Rims | Lightweight rim |
| Front Hub | aluminium hub body |
| Rear Hub | 4-speed freehub 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 Carbon |
| Chainset | Superlight carbon crankset with hollow BB30 axle, integrated spider, 56T chainring and chainguard |
| Bottom Bracket | FSA Mega Evo Bottom Bracket |
| Cassette | 11-13-15-18 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” |
Customer reviews and Q&A's are disabled because you declined functional cookies.
To enable reviews and Q&A's click the 'Cookie Settings' button below and enable functional cookies.
Brompton T Line 4 Speed 2025 - Folding Bike
Cycle to Work is a salary sacrifice scheme, where you can save up to 42% off a new Bike and Safety equipment. This means the cost is deducted from your salary as a non-cash benefit, so you save on tax and national insurance.
Here at Tredz, we accept Cycle to Work vouchers from all national schemes. For more information click here.
We understand that the Cycle to Work process can be a little slower than we would all like - so to help you pick the perfect ride, we're now offering FREE Cycle to Work Reservations (T&C's apply). Simply speak to a member of our Online Bike Experts Team via Live Chat to discuss your reservation. Find out more here.
At Tredz we make finance easy. You can choose from a range of flexible finance repayments from 6 months up to 48 months, choose to place a deposit and pay the balance on finance. Go with a 0% APR finance deal with absolutely no interest on payments, or a 9.9% APR Buy Now Pay later option with a choice of 12 or 24 deferred payment options, or a longer-term 14.9% APR option with lower monthly payments. For more information click here.
At Tredz, we’re committed to bringing you the best products at the best prices. If you find a product cheaper elsewhere, simply contact us for an immediate response using our live chat service. Click here to discuss your price match with an agent now for help.
Subject to Terms and Conditions
At Tredz, we offer a fast high quality service, with a range of options from free delivery on orders over £30, next day and convenient click & collect from one of our stores. Simply select within the checkout.
*Courier deliveries to Northern Ireland, Isle of Man, Isle of Wight, Channel Islands and the Scottish Highlands/Islands will incur a charge.At Tredz, if you are not 100% happy with your order, then you can use our simple hassle free returns service. Simply return the item new and unused in the manufacturers original packaging within 365 days of purchase. Bikes and larger items are collected by courier.
When you receive your bike, all you'll need to do is unpack it, attach the pedals, turn the handlebars and ride.
To help you get started we have put together a handy Bike Building Guide, click here.