Superlight electric Brompton…and it’s DIY

DIY electric brompton

Not content with reducing the weight of his Brompton to a feather-light 7.1KG, retired engineer Derek Cranage has once again beaten the British folding bike specialists at their own game by producing his own battery-powered version. The bike is a Brompton conversion where everything apart from the main frame has been replaced with lightweight parts and many purpose made items in carbon fibre, aircraft aluminium and titanium. Every item has been selected for its weight down to the last gram so every nut and bolt is titanium.

DIY brompton electric

The results are an electric folding bike that folds almost as small as a Brompton and weighs just under 10KG with the battery, or 10.4KG with a long-range battery giving 36-mile+ range. This compares to the factory electric Brompton, which weighs in at 16.6KG.

As well as bettering the specifications of a standard Brompton, Derek Cranage seems quicker about his work, too. The Brompton Electric was in development for over six years whereas Derek’s bike was designed and built over a 2 year period.

ETA cycle insurance

Ethical cycle insurance

Check your small print for so-called ‘new-for-old’ replacement – many insurers use the term, but if your bicycle is more than a few years old, they devalue it severely. This means you are left out of pocket when you come to replace it.

With ETA cycle insurance, however old the bike, if it’s stolen you get enough to buy a new model. Furthermore, every cycle insurance policy you buy from us helps support the work of the ETA Trust, our charity campaigning for a cleaner, safer transport future. No wonder The Good Shopping Guide judges us to provide the most ethical insurance in Britain.


  1. S Peterson


    So where do we buy this product!!

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