Imagine a bike that folds as easily as an umbrella…
…that’s ready to ride with a single flick
As easy to walk with as a roller case
Folded volume less than a Brompton
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BriefBike is still in development. If you would like to test one of our prototypes, sign up for our user test group.
It looks strange – is it comfortable to ride?
The riding position is designed to match a traditional roadster or ‘Dutch bike’. This isn’t the most aerodynamic, but it is very comfortable and also gives excellent all-around visibility when riding in traffic. BriefBike is designed for comfortable everyday use to get around.
Is it an e-bike?
Yes – most definitely! We’re working on some very exciting electric drive innovations that will be unveiled soon. Watch this space!
How much does it weigh?
When we launch our flagship model, it will be a fully equipped e-bike that weighs under 10kg. To achieve this, we’re working with development partners with the world’s most advanced aerospace composite capabilities. Our current prototypes are somewhat heavier than this, we’re using over-engineered structures to prove our design before focusing on lightweighting.
Does it have any luggage/cargo carrying?
Yes, we have a few options for carrying things, with attachment points at the rear of the main frame and on the top tube. A bag can be attached to the rear, which is transferred to the side when folded, allowing the folded bike and bag to be wheeled along together, maintaining the similar ergonomics to a roller case.
For people that need to carry larger or heavier items, there will also be a small trailer option. When the bike is folded, the trailer joins onto the side of the bike. The two wheels of the trailer combine with the two castor wheels on the bike to form a convenient 4-wheeled shopping cart.
Doesn’t the seat post go in the wrong direction?
Yes, in a sense, it does. This was required to achieve our super-fast fold. If you adjust the saddle height for different riders, the saddle position also needs to be adjusted forwards or backward to adjust for the unusual seat tube angle. When folding the saddle out of the way, there is no need to make this adjustment. When you do need to adjust the position for different riders, it’s a very quick tool-free adjustment, simply slide the saddle forward/backward to a comfortable position for you.
Do the handlebars fold?
BriefBike is designed to fold and unfold instantly into something compact enough to easily move around inside a building. It’s not trying to be a really small box at this stage. We want something that’s still tall enough that you can easily wheel it along without having to bend to reach the handle. This initial single-action fold rotates the handlebars, so the bike is a narrow package, but the handlebars are still quite high – a bit like the retractable handle on a roller case. You’ll find that most of the time, you won’t need to fold the bike any smaller, it’s already compact enough to lean against a wall and not get in the way.
There are, of course, occasions when you do need something more compact – such as putting the bike into a luggage rack on a train or a small cupboard or car boot. For this, it’s easy to fold the saddle and seat down, much like a traditional folding bike.
What are the folded dimensions?
When fully folded, it is 720 x 550 x 115 mm giving a volume of 46 liters. This compares with 585 x 565 x 270 mm for a Brompton (giving a volume of 89 liters).
It’s not as small as a Brompton, is it?
Yes and no. The fully folded package is almost the same length, while taller but narrower. The volume of this package is actually only about half that of a Brompton. However, as discussed above with respect to the folding handlebars, we were more interested in ergonomics and usability than achieving the smallest possible folded package.
Won’t the mudguards scrape on the floor when it’s folded?
Castor wheels are attached to the specially designed mudguards. These are designed to roll along the ground when the bike is folded. The two wheels are spaced widely apart, forming a stable base to pull the bike along. Your hand pulling on the handle forms the third point of contact for the bike, making it very stable – much like a roller case and unlike any other folding bike on the market.
Will it be difficult to find replacement parts?
You”ve probably spotted that many of the components will not be standard bicycle components. The parts that might need replacing, such as bearings, are all standard parts obtained from industrial machine parts suppliers. We are committed to providing full and open information on component specifications, so you will be able to easily locate replacement parts.
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