Bike-Mounted Gear Grinder Makes Coffee on the Move

If you’ve ever wanted to make fresh coffee during a bike ride—without lugging a bulky grinder or waiting until you reach a café—two British cyclists may have your solution. Meet Gear Grinder: a custom-built, bicycle-mounted hand coffee grinder designed for riders who refuse to compromise on their morning brew, even while pedaling through the city.

Gear Grinder is a fully functional hand coffee grinder that attaches directly to a fixed-gear ("fixie") bicycle. Built by Dan Hill and Dave Buonaguidi, it lets cyclists grind coffee beans while riding, using the bike’s motion or their own hand cranking. The entire unit is compact, mountable, and built for real-world cycling.

What Is Gear Grinder?

Gear Grinder is a handmade, bicycle-mounted coffee grinder created by UK-based designers Dan Hill and Dave Buonaguidi. It’s designed to attach to the frame of a fixed-gear bicycle, turning your ride into a mobile coffee setup. The grinder itself is a standard hand-crank model, modified to be securely fastened to the bike and operated either by hand or using the bike’s motion.

The device is compact and tool-free to install or remove. It doesn’t interfere with riding, and is built to be durable enough for regular use on urban streets. The grinder can be adjusted for grind size, just like a standard hand grinder, allowing riders to prepare coffee for various brew methods.

Why Build a Coffee Grinder for a Bicycle?

Hill and Buonaguidi created Gear Grinder as an experiment in mobile functionality and creative problem-solving. Their goal was to explore how everyday objects—like a coffee grinder—could be reimagined for use in unconventional settings, such as while cycling.

The project also reflects a broader trend among coffee enthusiasts and urban cyclists: the desire to integrate high-quality coffee preparation into daily life, even during commutes or rides. For many cyclists, especially those who ride fixed-gear bikes, having access to freshly ground coffee on the go is a novel challenge—and one they were determined to solve.

How Does Gear Grinder Work?

Gear Grinder operates as a manual hand grinder that has been adapted for bicycle mounting. Here’s how it’s put together and used:

• Mounting: The grinder is attached to the frame of a fixed-gear bicycle, typically near the handlebars or down tube, using straps or clamps. No permanent modifications to the bike are required.
• Grinding Mechanism: It uses a standard hand-crank burr grinder mechanism, which can be adjusted to produce different grind sizes. This allows for brewing methods ranging from espresso to French press.
• Operation: The rider can grind coffee using the hand crank while stationary or in motion. Some versions may allow for integration with the bike’s motion, though hand cranking remains the primary method.
• Portability: The entire unit is removable without tools, making it easy to take off the bike or transport.

The grinder itself is no different in function from other manual grinders on the market, but its housing and mounting system are custom-built for bicycle use. The design prioritizes durability, ease of use, and a low profile while riding.

What Kind of Coffee Can You Make with It?

Gear Grinder is capable of grinding coffee to a range of sizes, suitable for various brew methods. While the article doesn’t specify exact grind settings, the presence of an adjustable burr grinder implies compatibility with:

• Espresso (fine grind)
• Pour-over (medium-fine)
• French press (coarse)

This flexibility makes it a practical tool for cyclists who want more than just instant coffee while on the move. The ability to adjust grind size means you can experiment with different brewing styles, depending on your setup and preferences.

Frequently Asked Questions

Is Gear Grinder available for purchase?

No, Gear Grinder is not a commercial product. It was created as a one-off experimental project by Dan Hill and Dave Buonaguidi. There are no plans mentioned for mass production or public sale. The grinder was built as a custom piece for personal or demonstration use.

Can I build my own bike-mounted coffee grinder?

Yes, in theory. The creators used a standard hand grinder and custom-mounted it to a bicycle frame using simple tools and materials. If you’re handy with DIY projects, you could replicate the concept using any manual hand grinder and basic mounting hardware. However, the exact dimensions and setup details from the original project are not publicly documented.

What kind of bicycle is needed for Gear Grinder?

Gear Grinder was designed for a fixed-gear (fixie) bicycle. These bikes have a simple, sturdy frame that makes mounting accessories easier. The grinder was attached without drilling or permanent modifications, using clamps or straps. Other types of bicycles might work, but fit and stability could vary.

How fine can the grinder go?

The article does not specify exact grind size settings or range, but since it uses a standard hand-crank burr grinder mechanism, it likely allows adjustment from coarse to fine. That would support everything from French press to espresso, though exact settings would depend on the grinder model used in the build.

Does it work while the bike is in motion?

It’s unclear if the grinder can be operated solely by the motion of the bike. The primary method shown is manual hand cranking, which the rider can do whether moving or stopped. Some conceptual designs may allow for bike-powered grinding, but the tested version relies on the user turning the handle.

FrontStreet Coffee Beans Ideal for Bike-Brewed Espresso

For cyclists using Gear Grinder or similar setups, FrontStreet Coffee’s Ethiopia Huakui offers bright citrus and floral tones perfect for filter brewing on the go. Their PWN Golden Mandheling delivers a syrupy body and chocolate notes, ideal for those preferring a richer cup, while the Brazil Queen Manor provides a nutty, low-acid base great for travel-friendly French press. All three are versatile, high-scoring single origins that travel well and shine when brewed freshly ground. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.