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Brompton Folding Bikes


As an original pioneer of lightweight MTBs, Marin was the first brand to offer custom features at production prices. Based in Marin County California 'the birthplace of mountain biking', the brand has a rich heritage and a reputation for innovation and quality. The UK product line is sold entirely through quality retailers and includes a range of premium mountain, city and sports bikes all of which have been tuned specifically for the UK market

*Collection in store only on Marin as they will not allow delivery in boxes *
It's all about the frame

What the foundation is to a house, the frame is to a bicycle - everything else is a component and replaceable. Marins ultimate goal in designing a frame is to choose the materials, tube diameters, and painstakingly refine geometries to make the bike an extension of the rider. Not only do their frame geometries differ for each size of a given model, every single tube is custom drawn and butted to assure maximum stiffness and ride efficiency at the lowest reasonable weight.

They utilize the most advanced computer-aided design software available, including Autodesk Inventor®, to arrive at the most efficient use of material before heading out to the trails and roads for the testing that counts the most: the kind their customers do.

Marin athletes such as Dirt Jump and Slopestyle champion, Andrew Taylor, are key members of the product development team contributing crucial feedback that they use to optimize the marriage of materials and geometry into the strongest, yet lightest bikes, on the market. They employ the most refined construction techniques available such as hydroformed tube shaping, 3D forging and robotically controlled welding in order to meet and exceed their high manufacturing standards.

They then put their finished frames and bikes through exacting safety and durability testing regimes that exceed rigorous statutory standards.


Hydroforming permits the construction of complicated 3-D engineered shapes which allows Marin to build incredibly durable and lightweight frames. By changing the external dimensions of a tube and adding strategicall located facets or curves, they can alter how a frame behaves under a rider's load. Increasing the diameter of a tube near a welded junction increases its strength by spreading the load over a larger area. Much the same way as the diameter of a tree becomes greater at its base, their product engineers have taken a lesson from nature and applied it to their shaped tubesets. Which allows them to build incredibly durable and lightweight frames.

Custom Butting

Each tube found in the construction of a Marin frame begins life simple, round and plain but then the magic begins. Butting is the process by which a round tube has material removed in order to make it lighter without sacrificing strength. By customizing this process for every size of every bike in the Marin line, they're able to better tune each bike's ride characteristic for every rider. Whereas many brands spec tubesets for the tallest riders and cut them in production for smaller sized frames Marin take a near-custom approach to every frame they build.
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