Performance Line CX: the sportiest Bosch motor for eMTBs

Cropped representation of the Performance Line CX.

The Performance Line CX (BDU384Y) takes riding dynamics and agility to a whole new level. It is powerful, light and quiet. Our focus: the ultimate Uphill Flow.

The Performance Line CX has been the ideal drive unit for eMountain bikers since 2015. Its performance values are perfect for most riders. If you want to push yourself to the limit, you can unleash even better performance — by choosing the power, torque and support settings yourself.

120

Max. torque¹

200

750

Max. motor power

100

600

Max. support factor²

0.8

2.8

Rounded weight

Trick Check

Show everyone what you’ve got: Trick Check makes your skills measurable. Your tricks are recognised automatically and shown live on the display. Your best performances are saved in the eBike Flow app.³

Discover Trick Check

Performance upgrade 2.0

More power, more control – you decide. The next performance upgrade for the smart system is here. Get up to 120 newton metres of torque, 600% support, even more powerful propulsion and ride faster for longer.¹ ² ⁴ ⁵ ⁶

Discover now

Extended Boost

Extended Boost is now even better: Customise the extra boost in the eBike Flow app and use it across all riding modes and other drive units.⁷ Allowing you to overcome obstacles such as steps, roots or small rocks.

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"X-ray view" of an eMountain bike on a clean white background, showcasing its built-in components like the battery.

The Performance Line CX drive unit, highlighted against a black background.

ActionReactionUltra-fast

The Performance Line CX is more responsive than ever to your input

We have reinterpreted and improved the sensor signals.

The Performance Line CX drive unit, showcased without its outer casing, is set against a clean white background.

Torque sensor

A close-up of the Performance Line CX drive unit, displayed without its outer casing, set against a clean white background.

The torque sensor measures how much force is exerted on the pedals.

Cadence sensor

The cadence sensor measures how fast the cranks are turning.

Acceleration and tilt sensor

A close-up of the switch plate from the Performance Line CX drive unit, shown without its outer casing and set against a clean white background.

Acceleration and tilt sensors detect how the eBike is moving.

The drive unit does exactly what you want it to do – it is responsive, controlled, and direct.

The Performance Line CX drive unit, presented against a clean white background.

That is a natural riding experience.

The Performance Line CX (BDU384Y) is increasing in strength. Set the performance values of the drive unit yourself – individually customisable via the eBike Flow app.

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A person sits on their black eBike, holding a smartphone in hand. In the background, a blurred sea, the horizon, rocks, and a meadow create a picturesque setting. The smartphone display shows the settings for the riding modes in the eBike Flow app.

eMTB+ mode combines the precise controllability of eMTB mode with the full power of Race mode and closes the gap between the two.

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A rider/eBiker is riding on a trail with a loose surface in the woods.

You don't need a different riding mode to enjoy Uphill Flow. Because that's why we developed it.

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An eBiker rides over wood and stones on a forest trail in Sasbachwalden.

Walk assist and hill start assist

Right to the finish: helpful functions take the weight off your eMTB when you need to stop on tricky stretches.

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An eMountain biker rides uphill on a narrow trail, surrounded by fir trees and moss-covered rocks in Sasbachwalden.

Bosch eBike ABS Pro

Triumph over the trail: we have developed the Bosch eBike ABS Pro for outstanding performance.

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The front fork of an eBike is equipped with the Bosch eBike ABS Pro system.

Thanks to the electric gear shifting solution, you can ride to the trail with maximum relaxation and maximum performance on the trail.

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A close-up of the chain shifting system of a bicycle rear wheel with Bosch eShift and TRP system is visible.

Purion 400

Fully focused on your eMTB: a quick glance at the handlebar is all it takes to view all your riding data.

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The Purion 400 display is mounted on a bicycle handlebar. It shows the current speed on the display.

Extend the range and enjoy even longer trail fun with the water bottle-sized energy reserve.

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A person is attaching a Bosch PowerMore 250 battery to a blue e-mountain bike.

A natural riding experience is personalised – with the eBike Flow app, you can create a riding mode to suit your needs.

Open Overlay

The eBike rider is sitting on his eBike and looking at the home page of the eBike Flow app on his smartphone.

Trick Check automatically recognises Jumps, Wheelies, Manuals and Stoppies. Measure your skills and take them up a level – challenge yourself!

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Close-up of a hand holding a smartphone above an eBike handlebar. The display shows trick statistics for manuals and the performance share between the rider and motor in the eBike Flow app.

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The housing is made of magnesium – robust, corrosion-resistant, and hard.

The sealing concept prevents splash water from entering.

We were able to reduce the noise generated by the gearbox.

The Performance Line CX is quiet. It strikes a balance between power delivery and noise.

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Power. Distributed over 2.8 kilos.

The Performance Line CX is around 100 grams lighter than its predecessor.

Technical data
	Performance Line CX (BDU384Y)⁹
eBike system	The smart system
Shifting system type	Derailleur system, hub gear system
Max. support (%)	600 %
Maximum possible drive torque	120 Nm
Start-up behaviour	Direct, Powerful
Max. supported speed	25 km/h
Backpedal brake	x
Walk assist with Hill Hold	j
Hill start assist with Hill Hold	j
Gear shift detection	Hub gear system: no Derailleur system: yes
Weight, approx.	2.8 kg
Rated continuous output	250 W
Maximum power	750 W
Max. power at a cadence of 70 rpm	730 W
Max. power-to-weight ratio, approx.	268 W/kg

¹Maximum values: Deviations possible, depending on the hub gear system and battery. The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the custom riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app.
Exception gear shift detection: eShift hubs

² Maximum values: Deviations possible, depending on the hub gear system and battery. The performance values of this drive unit may be lower upon delivery. They can be increased and customised using the eBike Flow app. It should be noted that higher performance values can lead to increased wear and have a negative effect on the range.
The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the custom riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app.
Exception for gear shift detection: eShift hubs.

⁴Maximum values: Deviations possible, depending on the hub gear system and battery. The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the custom riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app.
There is no backpedal function for the derailleur system, but it is optional for the hub gear system.
Exception for gear shift detection: eShift hubs

⁵ Maximum values: Deviations possible, depending on the hub gear system and battery. The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the individual riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app. There is no backpedal function for the derailleur system, but it is optional for the hub gear system.
Exception for gear shift detection: eShift hubs

⁶ Maximum values: Deviations possible, depending on the hub gear system and battery. The maximum support of 600% relates to speeds of up to 15 km/h and can be increased in the Race, Turbo, eMTB+, Cargo and Auto riding modes. The values can be set individually to a limited extent using the eBike Flow app. It should be noted that higher performance values can lead to increased wear and have a negative effect on the range.
The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the custom riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app.
Exception gear shift detection: eShift hubs

⁷ The various riding modes are activated/deactivated by the bicycle manufacturer and the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated in the display. Using the individual riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app. It's not possible to customise your riding mode on S-pedelecs.

⁸ Maximum values: Deviations possible, depending on the hub gear system and battery. Activation/deactivation of the various riding modes is carried out by the bicycle manufacturer and the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated in the display. Using the individual riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app. It's not possible to customise your riding mode on S-pedelecs.

⁹ Maximum values: Deviations possible, depending on the hub gear system and battery. The maximum support of 600% relates to speeds of up to 15 km/h and can be increased in the Race, Turbo, eMTB+, Cargo and Auto riding modes. The performance values of this drive unit may be lower upon delivery. They can be increased and customised using the eBike Flow app. It should be noted that higher performance values can lead to increased wear and have a negative effect on the range.
The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the custom riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app.
Exception for gear shift detection: eShift hubs.

¹⁰ Maximum values: Deviations possible, depending on the hub gear system and battery. The maximum support of 600% relates to speeds of up to 15 km/h and can be increased in the Race, Turbo, eMTB+, Cargo and Auto riding modes.
The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated. Using the custom riding modes, the modes can be configured according to the individual needs of the eBiker, via the eBike Flow app.
Exception for gear shift detection: eShift hubs

¹¹ The weight refers to the pure motor weight of the Hub Line – without control unit and cadence sensor. Support is based on intelligent sensor fusion, which is why maximum support is not specified as a percentage. Maximum values: Deviation possible depending on battery. The eBiker can activate/deactivate the riding modes via the eBike Flow app, the bicycle manufacturer or the specialist dealer. A maximum of four riding modes, in addition to Off mode, can be activated.

Performance Line CX

BDU384Y (Gen 5) | Mid-drive motor

For a unique eMTB experience: The ideal system for demanding eBikers.

The smart system
Max. 120 Nm
Max. 750 W
Max. 600%

Current product

Performance Line CX

BDU374Y (Gen 4) | Mid-drive motor

Powerful and dynamic system for intuitive handling and a unique riding experience.

The smart system
Max. 85 Nm
Max. 600 W
Max. 600%

About the product

Performance Line CX

BDU450CX | Mid-drive motor

The powerhouse among the drive units.

Bosch eBike system 2
Max. 85 Nm
Max. 600 W
Max. 340%

About the product

All drive units

120 newton metres of maximum torque, with deviations possible depending on shifting system type. Higher performance values also mean higher wear and a lower range – we leave this individual decision to you. The eBike manufacturer can set a limit in the factory on the maximum torque. In the eBike Flow app, you can then only set the maximum torque specified by the manufacturer.
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Up to 600% support only up to 15 km/h. Available in Race, Turbo, eMTB+, Cargo and Auto riding modes. Details on the compatibility of your eBike can be found in the eBike Flow app.
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Trick Check works with the Performance Line CX (BDU384Y), Performance Line CX-R (BDU384Y), Performance Line CX Race (BDU374Y), Performance Line CX (BDU374Y) and Performance Line SX (BDU314Y) and on the following displays: Kiox 300, Kiox 400C, Kiox 500, Purion 200, Purion 400. Trick Check is not enabled as standard on the Kiox 300, Kiox 500 and Purion 200 displays and must be enabled manually under > "Settings > Display > Trick Check".
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Available in combination with DualBattery and the PowerTube 800, PowerTube 600 and PowerTube 750 eBike batteries for selected drive units of the smart system: Performance Line CX-R (BDU386Y), Performance Line CX (BDU384Y), Cargo Line (BDU384Y).
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Available in Europe only with the PowerTube 800 and PowerTube 600 eBike batteries and for selected drive units of the smart system: Performance Line CX-R (BDU386Y), Performance Line CX (BDU384Y), Cargo Line (BDU384Y).
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How long the maximum power of 750 watts is delivered depends on a number of factors, including cooling of the eBike components, the charge level of the battery, and the outside temperature.
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Extended Boost is already available for the following drive units of the smart system in the Race, eMTB+ and eMTB riding modes, but cannot be customised: Performance Line CX-R (BDU386Y), Performance Line CX Race Limited Edition (BDU376Y), Performance Line CX (BDU384Y), Performance Line CX (BDU374Y), Performance Line SX (BDU314Y). Customisation is available in every riding mode and for the following drive units of the smart system from mid-2026: Cargo Line (BDU384Y), Cargo Line (BDU374Y), Performance Line Sprint (BDU314Y). Extended Boost is not available in Limit mode.
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