Brompton Smart Brake Tail Light
Fits Line: A-Line, C-Line, P-Line, T-Line, G-Line
Being seen from behind is the most important safety decision you can make on your Brompton. This light makes it easy.
How it works
This tail light clamps onto your seatpost and stays there. One button cycles through six lighting modes. Recharge via USB-C when needed — a full charge takes under two hours and lasts anywhere from 5 to 10 hours depending on the mode you use.
The smart brake sensor is the standout feature: the moment you slow down, the light automatically flashes brighter to warn the traffic behind you. No extra buttons, no setup — it just works.
Key features
- Smart brake sensor — detects deceleration and triggers a high-intensity warning flash automatically. Drivers behind you see you braking before they'd otherwise react
- Six lighting modes — constant, fast flash, slow flash, warning flash, breathing flash, and flowing light. Slow flash and flowing light give you up to 10 hours per charge
- Light sensing — automatically adjusts brightness based on ambient light, saving battery and keeping visibility consistent
- IPX6 waterproof — rated for heavy rain and splashes, not just light drizzle
- USB-C charging — same cable as most modern phones. 400mAh lithium battery built in
- Lightweight — just 29g. You won't notice it's there
Fitting
Fits seatposts between 25.4mm and 31mm in diameter — which covers the Brompton seatpost. The mount uses a tool-free strap clamp and takes about 30 seconds to install. A saddle rail mount adapter is also included if you prefer that position.
Got a question?
Not sure if it fits your setup, or want help choosing the right mode for commuting? Send us a message — we're happy to help.
Specs
| Material | PC (polycarbonate) |
| Weight | approx. 29 g |
| Dimensions | 25.4 × 31 × 105.8 mm |
| Battery | 400 mAh lithium, USB-C rechargeable |
| Lighting modes | 6 (constant, fast flash, slow flash, warning flash, breathing flash, flowing light) |
| Battery life | 5–10 hours depending on mode |
| Waterproof rating | IPX6 |
| Brake sensor | Yes — automatic high-intensity flash on deceleration |
| Light sensing | Yes — auto brightness adjustment |
| Seatpost fit | 25.4–31 mm |
| Compatibility | Brompton |
Why order from Foldrio?
Because we've been in the Brompton accessories world since 2019 — and we stand behind everything we sell.
Every item tested for Brompton compatibility
We don't list a product until we're confident it works. No guesswork, no surprises.
2 year warranty on all products
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Free worldwide shipping
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Guaranteed delivery
If your order doesn't arrive, we send a free replacement.
Fast support from people who know Brompton
Questions about compatibility, installation or your order — we respond quickly.
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