Brompton Titanium Seatpost – Lightweight Upgrade, 560mm & 580mm
Fits Line: A-Line, C-Line, P-Line, T-Line
The stock Brompton seatpost is steel. It does the job — but it's one of the heaviest parts on the bike.
Swapping it for titanium is one of the easiest weight savings you can make. Same fit, same look, noticeably lighter. GR9 titanium alloy — the good stuff — in two lengths and two finishes.
How it works
This seatpost replaces your existing Brompton seatpost directly. It's 31.8mm diameter — the standard Brompton size — so it slides straight in with no modifications. Choose 560mm or 580mm depending on your height and how high you like your saddle. Both are longer than the original 535mm, giving you more adjustment range.
Key features
- GR9 titanium alloy — significantly lighter than steel, stronger than aluminium, and won't corrode
- Two length options — 560mm and 580mm, both longer than the stock 535mm for more adjustment
- Two finishes — natural titanium or anodised black
- 31.8mm diameter — direct fit for Brompton, no adapters needed
- Butted construction — thinner walls where it counts, keeping weight down without sacrificing strength
Available variants
Length:
- 560mm
- 580mm
Finish:
- Natural titanium
- Anodised black
Got a question?
Not sure which length suits your height? We're happy to help.
Specs
| Material | Titanium alloy GR9 |
| Diameter | 31.8mm |
| Lengths | 560mm, 580mm |
| Weight | approx. 250g |
| Finish | Natural titanium, Anodised black |
| Compatibility | Brompton A, C, P and T Line. Not compatible with G Line. |
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
Our warranty, not the manufacturer's. If something fails, we fix it.
100% money-back guarantee
Not happy? We refund. No questions asked, no forms to fill.
Free worldwide shipping
Always included. No fees at checkout, nothing due on delivery.
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.
No hidden costs
The price you see is the price you pay. No import fees, no customs charges, nothing due on delivery.