About the design    

The Brompton is a finely engineered and elegant machine. It has a full-size frame, which for strength and stiffness is made of several types of alloyed steel and aluminum. Thanks to a careful choice of alloys and tube sections, the bike is light and easy to carry. Actual weight depends on the configuration and ranges from about 25 to 27 pounds.
We stock several models of Brompton bikes. All have rear suspension, which also allows instant "parking" of the bike. This is a very handy feature and the first step in folding.  Many other parts are designed specially for the Brompton. In particular these bikes feature high-pressure tires and a powerful braking system.  These transform the feel and performance of these bikes.
The Brompton's remarkable ability to fold is achieved without complexity, and its maintenance needs are much the same as for a normal bike.
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The central feature of the Brompton is its brilliantly conceived folding method. It has to be seen to be believed..... the Brompton is one of those rare technical advances that in practice genuinely extend the scope and attractiveness of cycling" Robert Poole, NEW CYCLIST

Folding or unfolding is a simple procedure, as once parked the Brompton stands on its own leaving both hands free. There are three main parts to fold and it takes just fifteen to twenty seconds. When folded, a Brompton stays locked together automatically, making an extremely compact package, little larger than its wheels.
Rollers underneath make it easy to STOW the bike in inaccessible corners and these can even be used for wheeling the folded bike around.
As for the ride, the Brompton's a pretty lively machine. The combination of Sturmey Archer hub gears, a rigid frame and accurate alignment makes for really efficient transmission of your energy. Moreover, its small wheels have a number of intrinsic advantages: they are strong, light, easy to accelerate and highly manoeuvrable.
The Brompton is the only bike in the world to combine such ready portability with a first-class ride
in a high quality manufactured product. A Brompton creates countless new opportunities for using a bicycle.

It is the sort of bike you can hand in with your coat at a restaurant cloakroom and have clicked back into shape while friends are still arguing over where it was exactly they parked their car.." Daniel Ward. THE TIMES

 

Brompton Described Welcome Picture Show