Fitting the Bosch Kiox 400C Display with Universal Mount to a Bosch Smart System Ebike

Within Bosch’s Smart System, the Bosch Kiox 400C is currently considered perhaps the manufacturer’s best ebike display. With its combination of a two-inch colour screen and a USB port for charging external devices, it brings together practical features that other Bosch displays offer only individually or not at all. It’s just a shame that it’s tied to integration into the top tube. In theory, at least. In practice, there is a universal adapter that moves the display from the top tube to the handlebars. Its installation is so simple that it can easily be done at home.

1. What is the Ebike24 Universal Mount for the Bosch Kiox 400C?
2. What options are available for mounting the adapter?
3. Fitting the Universal Mount in combination with a single-arm handlebar mount
4. Fitting the Universal Mount in combination with a Fidlock Ahead cap
5. Adding the new display in the Bosch eBike Flow app
6. Supplementing the Bosch Kiox 400C with a Bosch Mini Remote control unit

1. What is the Ebike24 Universal Mount for the Bosch Kiox 400C?

Bosch intended the Kiox 400C to be mounted on the top tube. As a virtually fully enclosed unit, it sits directly within the frame. The Ebike24 Universal Mount takes advantage of precisely this feature. It gives the display a new environment – a plastic shell instead of a bike frame. And with this, you can alternatively mount it on the handlebars or stem of your ebike with the Bosch Smart System, even if the model does not have a recess in the top tube.

2. What options are available for mounting the adapter?

There are two simple ways to retrofit the display. In this tutorial, you’ll learn about both. The first solution is based on a single-arm mount on the handlebars. We’re using a model from Acid. However, there are also numerous similar products from other manufacturers. In any case, the Universal Mount is mounted on the single-arm mount and thus attached to the handlebars. In the second solution, the mount sits directly on the ahead cap of the stem. This is made possible by an ahead mount from Fidlock.

3. Fitting the Universal Mount in combination with a single-arm handlebar mount

We are using a 2024 model year KTM Macina Cross 720 as a demonstration model for this installation option.

Ebike system at a glance

• Motor: Bosch Performance Line CX – BDU374Y
• Battery: Bosch PowerTube 750
• Control unit: Bosch LED Remote
• Display: Bosch Kiox 300 + Bosch SmartphoneGrip

Accessories required for installation with single-arm mount

• Bosch Kiox 400C display
• Universal Mount
• Single-arm mount, rubber spacers if required
• 2 x wedge lock washers
• M5x16 flat-head screw
• M4 self-locking hex nut
• M5 hex nut
• O-ring 5×2.5 mm
• 3 mm Allen key
• 10 mm Torx screwdriver
• Drill and 5 mm wood drill bit

Our aim is to fit a new display to the KTM Macina Cross 720 using the Bosch Kiox 400C. To do this, we’ll start by removing the existing setup consisting of a Bosch Kiox 300 and a Bosch SmartphoneGrip. To do this, we’ll remove the display and disconnect the display cable coming from the motor. We’ll then detach the mounts from the handlebars.

In our view, there are two sensible positions for the new display when used with the single-arm mount. It can either be positioned centrally above the stem or to the right of the stem. Decide for yourselves which you think is best.

Not just screwing, but drilling too

We want to position it above the stem. This means that the mount is fitted to the left of the stem, so that the Kiox 400C ends up positioned to the right, directly above the stem. Consequently, in the adapter shell of the Universal Mount, the mounting hole must be on the left-hand side, whilst the opening for the cable exit faces forwards.

When delivered, no holes have yet been drilled in the shell. You do this depending on the position you want the Kiox 400C to be in. The suitable spots for positioning the drill bit are already marked. The plastic shell can be drilled through effortlessly using a 5-millimetre drill bit. A wood drill bit is recommended for this step, as its sharp tip provides good guidance.

On the inside of the shell, you will see a hexagonal opening. Insert the supplied M5 hex nut into this. Next, take the single-arm bracket, fit the flat-head screw with the rubber O-ring and thread it through the hole on the outside of the bracket. Place the two locking washers onto the end of the screw that is protruding on the other side. Now connect the single-arm mount to the universal adapter by feeding the screw through the hole you have just drilled into the shell.

Extra security with Apple AirTag

The single-arm mount and shell now form a single unit. This is mounted onto the handlebars in the next step. For handlebars with a diameter of 35 millimetres, this works without the need for additional spacer rings. However, if your ebike’s handlebar measures 31.8 millimetres, you will need to insert the latter. Initially, simply tighten the single-arm mount by hand. This will allow you to easily adjust its position during the rest of the installation process.

If you generally want to make your ebike trackable with an Apple AirTag, or specifically the Kiox 400C and its Universal Mount, now is the time to insert an AirTag into the shell. It fits perfectly into the recess designed specifically for this purpose.

This completes the assembly almost entirely. Finally, insert the Kiox 400C into the universal mount and secure it using the display screw and the self-locking nut. You’ll need a 10-millimetre Torx screwdriver for this. Finally, check that you have a clear view of the Kiox 400C. If not, adjust the positions of the single-arm mount and the adapter shell accordingly. Once everything is in place, carefully tighten the remaining screws to the correct torque.

4. Fitting the Universal Mount in combination with a Fidlock Ahead cap

For this installation method, we are using a 2026 model year KTM Macina Lycan 772 Glorious as a demonstration model.

Ebike system at a glance

• Motor: Bosch Performance Line CX – BDU374Y
• Battery: Bosch PowerTube 750
• Control unit: Bosch LED Remote

As mentioned at the start, the stem is also a suitable location for mounting the Universal Mount for the Bosch Kiox 400C. Instead of the single-arm mount, the Fidlock Ahead Cap is the method of choice for securing it.

Accessories required for mounting with the Fidlock mount

• Bosch Kiox 400C display
• Universal Mount
• M4 self-locking hex nut
• Fidlock Vacuum Ahead Cap including screw
• Fidlock Ahead Cap clamp including screw
• 5 mm Allen key
• 2.5 mm Allen key
• 10 mm Torx screwdriver

The installation appears quite straightforward. First, unscrew the ebike’s current ahead cap from the stem. The Fidlock solution comes with its own stem cap featuring a special rim. Thanks to this, a plastic locking ring can be clicked into place on the cap. This acts as the counterpart to the Universal Mount for the display. Attach the cap and locking ring to the stem using a 5-millimetre Allen key. You can now place the Universal Mount onto this assembly and press it down gently. You’ll quickly notice how the shell snaps into place on the retaining ring. To ensure everything stays securely in place whilst riding, you’ll need to secure the whole assembly with the lock nut and a 2.5-millimetre Allen key. It is important here, once again, that the outlet for the Bosch Kiox 400C display cable on the Universal Mount points forwards in the direction of travel. The final step is simply to insert the display into the shell and secure the display screw using the self-locking nut.

5. Adding the new display in the Bosch eBike Flow app

Whether using the single-arm mount or the Fidlock Ahead cap – the Bosch Kiox 400C now greets you from the cockpit of your ebike. However, the ebike system itself hasn’t noticed this yet. You still need to let it and the Bosch eBike Flow app know that there is a new device to integrate.

In our case, we reconnect the Bosch LED Remote to the display cable coming from the motor and open the Bosch app. There, we navigate to the “eBike Lock” function and deactivate it. If you don’t use this function, you can skip this step. Next, head to the “ebike settings”. In the ebike menu, click on “Remove ebike”. Then switch off the bike. Now unplug the display cable from the control unit – in our case, the LED Remote – and plug it into the Kiox 400C. You can now switch on the ebike using its on/off switch. Connect to the app as usual and follow its instructions until the Kiox 400C is set up as the primary display.

6. Supplementing the Bosch Kiox 400C with a Bosch Mini Remote control unit

If everything works as planned, the previous control unit will no longer be needed from that point onwards. You can therefore remove it without any concerns. In this configuration, you will operate the e-drive on your ebike exclusively via the Bosch Kiox 400C from now on. However, if you wish, you can also get the Bosch Mini Remote as a small control unit. The advantage of this is that you can control everything whilst keeping both hands on the handlebars. Experience shows that all the buttons on the Mini Remote can be easily reached with the thumb of your left hand.

Adding this wireless control unit is incredibly simple. You just mount it on the handlebars in the appropriate position. Then open the Bosch eBike Flow app, go to the ‘My eBike’ menu and navigate to the eBike Pass. Here you’ll find a list of all the current components of the electric drive. At the very bottom, you’ll see a button to add new devices. Tap it, and a few minutes later the Bosch Mini Remote should be registered in the system.

Pictures: Elektrofahrrad24 GmbH