Brompton T Line 4-speed - Low

Next expected availability: End June 2025

Brompton T Line Urban 4-Speed - Low - details:

1. Frame

Main frame: Grade 9 titanium tubes, welded main frame with cast titanium bottom bracket manifold
Rear Triangle: Advance Superlight rear frame with replaceable hanger, suspension block and 54mm roller wheels
Fork: One piece carbon fork and steerer with magnetic pedal holder

2. Size and Weight

Folded size: 599mm wide x 645mm tall by 320mm deep
Weight: 7.95kg 

3. Colour

Main frame: Blasted Titanium
Handlebar stem: Blasted Titanium
Forks: Black carbon
Rear triangle: Blasted Titanium
Decal: Etched
Detailing: Black

4. Handlebars and grips

Superlight Carbon low rise handlebars / sports bars (previously known as the S type) - for a sporty / aerodynamic riding position
Superlight lock-on foam grips (130mm and easily changeable with your favourite grips if wanted)
Handlebar width - 58cm

5. Gears / drivechain

4 speed advance Brompton derailleur system - saving weight over the traditional hub gear system previously favoured by Brompton
Derailleur chain tensioner
Superlight carbon crankset with hollow BB30 axle, integrated spider, 56T chainring and chainguard
FSA Mega Evo Bottom Bracket
106 link Brompton advance chain with connecting link
Superlight pedals (the right one is removable) which were introduced with the T Line
4 rear rear sprockets - 11-13-15-18 tooth
Integrated 4-speed gear shifter on left side of bars - black

6. Front luggage system

This T Line comes with a T Line specific front carrier block fitted for carrying Brompton bags 

7. Mudguards / Rack / Hinge clamps

This bike comes with black advance mudguards
No rack / roller frame is included - though it can be retro-fitted
Self aligning aluminium hinge clamps to help you un-fold quicker 

8. Roller wheels

New advance roller wheels help keep the bike stable when folded 

9. Tyres / Wheels

Schwalbe ONE with Addix race compound and v-guard puncture protection 
16 inch (ETRTO size 349) wheels with double wall rim

• 28 spokes  on the rear - Lightweight rim, double butted spokes, aluminium hub body and 4 speed freehub body
• 20 spokes on the front - Lightweight rim, double butted spokes and aluminium hub with sealed bearings and allen key axle

The wheels have black hubs, black spokes and black rims (the braking surface is still silver)
Inner tubes -  S-tubo 34g tube with Presta/racing type valve

10. Saddle and pump 

Brompton superlight carbon saddle, this superlight carbon saddle features carbon rails, a carbon reinforced base and lightweight padding, it features a low profile and wave shape and has the under saddle mounting for the Be Seen Lights
Fitted with the superlight pentaclip which is a machined aluminium seat clamp and rear frame clip in anodized matt black finish

The Brompton Lezyne pump is not included with the T Line (to save weight) but can be purchased separately - it fits to the rear triangle of the bike

11. Seat height

Standard height steel armoured carbon seatpost for riders with an inside leg measurement of up to 33 inches
If you are taller - up to 35 inch inside leg - then an extended length carbon seatpost can be fitted at no extra cost
For very tall riders a telescopic seatpost is available at extra cost - sorry a carbon version is not available 

Saddle height insert is included - try riding the bike for a while to get used to your ideal / optimum seat height before fitting

12. Suspension

Along with the new T Line comes a new advance suspension block

13. Lighting / reflectors

Front and rear reflectors are included
It's easy to retrofit battery lighting such as:

• Brompton Spanninga solo rear light - fits to reflector bracket
• Brompton CatEye VIZ 150 rear light - mounts to Brompton saddle
• Brompton CatEye 500lm front light - mounts to bracket on front fork
• Brompton Be Seen Light set (front and rear) - mounts to Brompton saddle (rear) and integrated brake lever (front)