FAQ

When ordering a Gravaa wheelset, you will receive a front wheel and a rear wheel, plus:

• Disc brake rotors of your choice (mounted in the selected size, 140-160-180mm)
• A freehub body of your choice (pre-installed)
• An ergonomically designed wireless control unit that mounts on your handlebar
  
• A set of small tools and some necessary spare parts
  

Gravaa wheelsets have a product lifetime comparable to standard wheels. We provide you with a 2-year warranty period on non-wear parts. If you experience any degradation or issues with the performance of your wheels, please contact us. We will make sure to get you back on the bike as soon as possible. Read more about warranty conditions here.

Yes, you can. With the Gravaa app installed, your smartphone is an alternative control and display for riding. Without your phone and control unit, you cannot adapt the pressure of your tires. In this instance, Gravaa will maintain the pressure of your last used setpoint.

No, it's a one-time setup. After one (full) rotation, your wheels get active. Your control unit wakes up after a button press . After that, the coupling between the wheels and control unit is set automatically.

During the initial setup, the app will ask you to enter details of your tires and a few other bits of information. Gravaa will intelligently suggest a starting or default tire pressure based on what you enter. Naturally, you are free to change these default settings. However, Gravaa won't let you set a higher pressure than the maximum rating of your tire, for obvious reasons.
Read more about optimal tire pressure here.

You won’t need it often, but it’s there to give you the option to start your ride with the correct pressure (you can inflate using your standard bike pump if you want) or in case you have a flat tire. However, in almost all cases, there’s no need to use your bike pump anymore—just leave it to Gravaa.

When you order your Gravaa wheelset, you can select the correct freehub body for your groupset. We can deliver our wheelset with one of the following freehub bodies, which are compatible with the following cassettes:

• Shimano Road HG 11 speed
• Shimano Microspline 12 speed
• Campagnolo Ekar 13 speed
• SRAM XD/XDR.

You can display the tire pressure (front and rear) on your bike computer using ANT+ or Bluetooth.

Our first two wheelsets, the GX-30 and XC-28 sets, are intended for gravel biking and (cross-country) mountain biking respectively and are not specifically designed for e-bikes. However, they may fit in bikes with a middle engine. Bikes with an integrated motor inside the hub will conflict with our wheels.

No, but the good news: we are compatible with most bike frames.

The following requirements apply:

• Either boost (110 mm front / 148 mm rear) or non-boost (100 mm front / 142 mm rear) will work, and
• Disc brake only: with rotor diameters from 140 mm to 180 mm*,
• Thru axles with diameter of 12 or 15 mm front, and 12 mm rear,
• Freehub types for Shimano/SRAM 9-10-11 speed, Shimano Microspline 12 speed, Campagnolo Ekar 13 speed, or SRAM XD/XDR.

*this range will be extended further in future

Yes, you can use the one from your bike.

No, we have designed dedicated Gravaa disc brake rotors, which are integral to the design and save weight. Our disc brake rotors are mounted with seven bolts and are among the lightest on the market. The disc brake rotors are included as standard with your wheelset.

Yes, you can. There is still a Presta interface mounted, which fits your bike pump. You will not need it often, but it’s there to give you the option to directly start with the correct pressure (for example, before a ride you can pump it up using your standard bike pump), or in case you have a flat tire.

However, in most cases, there is no need to use your bike pump anymore. Just take your bike out for a ride as long as your tires are not too low in pressure: the GRAVAA wheels will automatically inflate your tires back to the last used setpoint while riding.

Gravaa wheels shall be compatible with tire sealants, as riding tubeless is widely used. As you can imagine, we do not want any of this substance to enter our system. The prototypes are undergoing intensive testing to make them function optimally.

Our wheels install just like any other wheels. There are no additional requirements. Simply tighten the wheel axles, pair the control unit with the wheels, and follow the in-app instructions for first-time setup. After that, it's time to ride.

All of the internal parts of our hubs are free of maintenance except for the following:

• Standard wear parts in the wheels, like wheel bearings, which can be replaced. Please see the User manual for instructions.
• Air filters keep the system clean from outside dirt so it functions properly. The system will automatically recognize when to replace filters and notify you. Replacement is easy. Spare filters are delivered with the wheelsets and will also be available via our webshop. Replacement instructions will follow.
• Furthermore, you will need to charge your hubs occasionally to enable wireless communication and proper/safe usage. 

! On a serious note, please do not open the hubs yourselves, as this will invalidate your warranty (please check our service and warranty conditions here). If you have a product issue or would like to explore a topic in greater detail, please do not hesitate to contact us via our Contact form

The batteries inside the hubs are rechargeable. You can ride about 1 to 3 months with full batteries in normal use. To prevent issues, we recommend charging batteries before each use of your wheelset.

Inside the control unit, there is a replaceable coin cell battery (type CR1/3N), which lasts for about 6-12 months, depending on usage. 
You can easily read the battery status of both wheels and the control unit from the Gravaa app.

The answer is simple: only a little. The exact power consumption when Gravaa actively inflates your tires depends on many factors, as the Technology page explains. On average, the power consumption is 4 Watts (per wheel) when inflating and 0 Watts when the system is no longer inflating (deflation requires no power, of course). The power Gravaa does draw (when active) is more than compensated by the advantages you will achieve by riding with adaptable tire pressure; with less friction/rolling resistance or improved traction, you stand to beat your friends or competitors.

None whatsoever.

This also depends on some factors (like inflation) but it’s so fast that you won’t notice it.

It depends again on some factors, as explained on the Technology page. The size of your rubber, riding speed, and the pressure levels you are switching between are the main factors that determine the time it takes to inflate your tires. On a gravel bike with 1.50″ (40 mm)  tires, increasing the tire pressure by 0.6 bar takes about one minute. A mountain bike with 2.25″ (57 mm) tires takes three times longer to bridge the same pressure difference.

Gravaa wheelsets won’t ship until they are ready to hit the consumer market. The expected delivery date is mentioned during checkout. Orders will be shipped directly as soon as possible. Our newsletter will notify our customers about progress and shipping updates regularly via our newsletter. 

While our goal is to be everywhere our customers ride, we have chosen to limit our coverage to the countries listed on our Shipping page to ensure a seamless service and experience. We aim to extend our coverage in the future, so stay tuned.

Shipping is free for all orders if you are ordering from one of the countries we currently ship to.

If and when you are a consumer (not professional trader) you are allowed to cancel your order within 14 days after the date of ordering. In case of cancellation, the provisions of our GENERAL TERMS AND CONDITIONS OF SALE AND DELIVERY apply. GRAVAA also has a cancellation policy which can be separately viewed below.