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A man riding a Brompton x CHPT3 V4 at night on a bridge in New York
Brompton x CHPT3
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The 4th Edition


Turning a new page in the Brompton and CHPT3 story, the latest collaboration brings a fresh dynamic to a proven partnership. One founded on fun, practicality, and high performance.


Drawing on our previous three collaborations with David Millar of CHPT3, we turn to page 4, and the horizon broadens. A bike that originated as a city commuter and became a daily workhorse for David, a former pro-cyclist, is now embraced by a community who see beyond simply departing from point A and arriving at point B.


To own a Brompton x CHPT3 is to belong to a community of like-minded riders from Indonesia to Indianapolis, a community that is powered by new members like you.



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A studio image of the Brompton x CHPT3 V4
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Made for speed


Handbuilt titanium and steel frame. All the practicality of a Brompton in a lightweight and performance oriented form.

More than 1.5kg lighter than the original bike.


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2 people riding the Brompton x CHPT3 V4 on a New York city cycle lane at night
A fast and light wheelset

Designed and tested to stand up to daily use in the city, in all weathers. On superb tan-walled Schwalbe One tyres for optimal grip and maximum style. With weight-saving Tubilito innertubes.

A Brompton x CHPT3 V4 in a group of cyclists
A woman carrying the Brompton x CHPT3 V4 overhead with a single arm
Superlight, compact gearing system

The Brompton 4-speed system* for rapid urban acceleration and nimble climbing ability. With a 60-gram derailleur, meticulously engineered to fit inside the narrow fold.

*patent pending

fi’zi:k Terra Argo X5 saddle

We chose this gravel-specific saddle for the superb vibration absorption, and the short nose. This gives you a stable, planted position. You can shift further forward too– the ergonomic design minimises pressure on any sensitive parts. Cleverly thought-out drainage channels make it brilliant for wet-weather riding.

A man riding the Brompton x CHPT3 V4 in a new york street at night
The Brompton x CHPT3 Pouch on the bike
Brompton x CHPT3 Frame Pouch

Your CHPT3 comes with a limited-edition Frame Pouch Bag. It’s inspired by how the community use their Brompton x CHPT3 bikes - moving fast around the city, racing, heading out on long weekend rides. It’s perfectly sized for a spare tube and tools. Just like the bike, it’s minimalist, practical and brilliantly durable. In abrasion resistant Hypalon fabric with a welded, waterproof construction.

A person straddling a Brompton x CHPT3 V4 on a sidewalk in front of a fire hydrant in NYC
CHPT3 Collaboration History