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.