The miniature pump

Very small and powerful multi-stage membrane pump with a high efficiency. Purely driven by wheel rotation.


Controls the activation and deactivation of the pump for zero power loss when not inflating.


A PCB with on-board sensors, antenna, and miniature electropneumatic valves, allowing for fast and accurate tyre pressure control and wireless communication (using BLE 5.0 and ANT protocols).

GRAVAA GX-30 wheel

Carbon rims

For our lightweight wheels we make use of light carbon fiber reinforced rims. We made the design of the rims ourselves, in close collaboration with our rim manufacturers: an optimal design with a good balance between weight, stiffness/strength and riding experience. Our R-40|44, GX-30 and XC-28 wheels use different rims, which fit their application best:

  • GRAVAA R-40|44 wheels compose of symmetric Reserve Wheels 40 mm high rims (front) 44mm high rims (back) with an inner width of 25-25.5 mm. The rims have no spoke offset.
  • GRAVAA GX-30 wheels compose of asymmetric 30 mm high rims with an inner width of 25 mm. The rims have a spoke offset of 2.5 mm.
  • GRAVAA XC-28 wheels compose of asymmetric 28 mm high rims which are available with an inner width of 25 mm or 30 mm. The spoke offset is 2.5 mm.

All our carbon rims are made with advanced carbon fiber technology. We guarantee the highest precision, lightweight, and strong rims. All our rims undergo extensive testing, supported by recognized external wheel testing institutes, to provide us with rims of highest quality.

Control Unit for GRAVAA system

Our HMI: manage, display and set your system

Manage You can manage the tyre pressure with a flick of the thumb while riding. This can be done via a wireless control unit that is mounted on the handlebars. Because the system must be easily controllable in dynamic situations we have put a lot of effort in making an ergonomic control unit, intuitively simple with haptic feedback. By pressing up/down, the system reacts on your commands directly. Blinking LEDs will give basic user feedback. The wireless control unit is standard delivered with our wheels.

Display Being compatible with standard bikes and equipment is important. Therefore, we provide the option to display the tyre pressure of your front and rear wheel onstandard bike computers, using standard data fields. A list of compatible devices will be released later*. Next to this, tyre pressures can be displayed via a GRAVAA app on your smartphone. This mobile app will be made available for download in the Google Play Store and Apple App Store.

Settings Use the GRAVAA app on your smartphone to set up your system before first use, change detailed system settings (for example: enter custom pressure setpoints), connect devices, install updates, et cetera.


*currently we use a Garmin Edge 830 bike computer – but compatibility will be extended. The bike computer is not supplied by GRAVAA.

Our freehubs

Our wheelsets are specifically designed to handle every terrain, therefore robustness is key for a carefree rider experience!

All of our free hubs are equipped are loaded with features every rider will appreciate and equipped with the most reliable freehub system available in the market; DT Swiss’ Ratchet System. By providing this DT Swiss freehub system we will give our users the best quality and the freedom to switch their body to suit another group set or cassette very easy. All DT Swiss products are widely available on the market, means you never have to worry about the replacement of wear or tear parts.

To be compatible with a wide range of group sets, you can select the freehub body of choice. We offer compatibility with the following cassettes:

  • Shimano MicroSpline 12sp,
  • Campagnolo Ekar 13sp
GRAVAA disc rotor

Our lightweight disc brake rotors

Our wheelsets are designed for disc brake only. To reduce weight, we have chosen to integrate the disc brake rotors in our hubs. Hereby, we are able to create one of the most lightweight disc brake rotors on the market. The rotors are made of specially hardened stainless steel and are available in three different sizes:

  • diameter = 140 mm (81 grams)
  • diameter = 160 mm (98 grams)
  • diameter = 180 mm (115 grams)

The disc brake rotor of choice is standard part of your GRAVAA wheelset.

App on smartphone

As mentioned above, a GRAVAA app on your smartphone will be made available for download in the Google Play Store and Apple App Store. Using this app, you can:

  • Set up and manage all wireless connections to your wheels,
  • Customize system settings,
  • Switch between fixed increment mode, or pressure profiles (preset mode),
  • Choose an offset pressure for rear tyre (compare to front tyre),
  • Gather detailed system information,
  • And many more…

By using the GRAVAA app, you will get most out of our system!