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Brompton T Line Ceratech black 4 Speed - Low

B-T-S4L-BT-RTi-SPC-CARB-CT

Brompton

Brompton T Line Ceratech black 4 Speed - Low

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Brompton T Line Ceratech 4 Speed - Low

The T Line Brompton or titanium was introduced in 2022 and is now (as of April 2025) available in this Ceratech black version. The mainframe and stem are coated with a robust techceramic coating called Cerakote, usually used on spaceships and racing cars, and the touch points are purple 

A bit about the coating:

Cerakote is a ceramic coating that is known for being lightweight and tough, providing abrasion resistance, strength and hardness compared to powder coating

This coating will ensure your T line is further protected from corrosion and also looks great

The coating is applied with a spray gun as a thin film and is cured by heat or air, the layer is only 40 micros thick (that's half a human hair) and half the thickness of powder coating

The Cerakote coating is also easy to clean! 

Brompton T Line 4 Speed - Low - Ceratech Black - specification:

This is a 4-speed version (the T Line 4-speeed was launched in January 2024 with the Ceratech version launched in April 2025)

This bike has been designed to be the lightest Brompton ever made, with a titanium frame and rear triangle, finished with carbon forks and a titanium stem

Titanium is light, strong and naturally corrosion resistant means high shine and zero rust in all conditions

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
Aluminium purple, hinge clamp levers, roller wheels, seat post clamp and seat post clamp lever 

2. Size and Weight

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

3. Colour

Main frame: Cerakote black coated titanium 
Front frame: Blasted titanium 
Handlebar stem: Cerakote black coated titanium
Forks: Black carbon
Rear triangle: Cerakote black coated titanium 
Decal: Etched 
Detailing: Black

4. Handlebars and grips

Superlight Carbon low rise handlebars (previously known as the S type). Unlike previous models of Brompton, the bars can be relatively easily changed should you decide you prefer the mid / classic bars

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 
Derailleur chain tensioner
Superlight carbon crankset with hollow BB30 axle, integrated spider, 50T 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
Integrated 3-speed hub gear shifter on the right side of the bars - black

6. Front luggage system

T line specific front Carrier Block is fitted as standard, if you want to carry Brompton luggage 

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 - these are purple aluminium 

8. Roller wheels

New advance roller wheels help keep the bike stable when folded - purple

9. Tyres / Wheels

Schwalbe ONE Tan wall tyres 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
Pump not included but can be purchased seperately 

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 Spanning solo rear light (saddle mounted)
  • Brompton CatEye 500lm front light
  • Brompton Be Seen Light set (saddle mount rear and brake lever mounted front)

We made the below video about the black Ceratech version of the T Line to highlight the differences

 

We made the below video about the Brompton T Line as soon as we could: 

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Brompton T Line Ceratech black 4 Speed - Low

Brompton T Line Ceratech black 4 Speed - Low

Brompton T Line Ceratech black 4 Speed - Low

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Data sheet

Colour:Blasted Titanium
RangeT Line
Handlebar Type / Size:Low
Brompton Gears4 speed
Brompton MudguardsMudguards
Model Year2023