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Bosch eBike Systems · 2025
The most powerful Bosch mid-drive is now lighter, quieter and smarter — 85 Nm of torque, up to 340% support and a 6-axis brain that reads the ground beneath you.
Key figures
Maximum torque for steep, loose and technical climbs.
Up to 340% assistance — your effort, amplified.
Compact drive unit, roughly 100 g lighter than before.
An inertial sensor reads acceleration, tilt, incline and vibration.
Explore · the drive unit
Hover, tap or tab through the markers on the drive unit to see what's engineered into the 2025 motor.
What is it
The Performance Line CX is Bosch's flagship mid-drive motor for eMTB and high-power trekking eBikes. It delivers 85 Nm of torque and up to 340% pedal assistance while weighing around 2.8 kg, and pairs with the Smart System — new IMU sensing, PowerTube batteries and the Bosch Flow app.
In its 2025 (Gen 5) form it's lighter, runs quieter thanks to a decoupled drivetrain, and hides its electronics inside a stone-chip-resistant magnesium housing.
Interactive · pick a mode
Switch tabs to see how each mode shapes power and range. No app required.
Progressive, dynamic support that scales with your pedal pressure. Ease off for control in tight sections, push hard and it surges — all without touching a button.
The full 340% assistance and 85 Nm on tap for the fastest, most direct response Bosch offers. Range is shortest here — save it for the moments that count.
Reads terrain and gradient via the IMU and blends between Tour+ and eMTB automatically, balancing power and range without any input.
Efficient, steady assistance that adapts gently to your pedalling. The sweet spot between reach and response for everyday and touring rides.
The lightest touch of assistance for the greatest efficiency. Squeeze every last watt-hour out of the battery when distance is the goal.
How it works
A 6-axis inertial measurement unit tracks acceleration, rotation, tilt, incline and vibration hundreds of times a second.
The system recognises the terrain type and how steep the gradient is — long before you'd react to it yourself.
Power is shaped to the moment: Hill Start Assist for take-offs, Extended Boost over obstacles, smooth delivery everywhere.
Compare · what changed
Battery & range
FAQ
The Performance Line CX delivers 85 Nm of torque and up to 340% pedal assistance, making it Bosch's most powerful mid-drive for eMTB and high-power trekking eBikes.
It's around 100 g lighter, quieter thanks to a decoupled drivetrain, and built with a stone-chip-resistant magnesium housing. It adds a 6-axis IMU for terrain sensing and a new Hill Start Assist feature.
It runs on the Bosch Smart System with PowerTube 600 Wh and 800 Wh in-frame batteries — the two share a footprint so they're interchangeable — plus the bottle-sized PowerMore 250 range extender for up to 1,050 Wh total.
eMTB is a progressive, automatic support mode. Instead of switching between fixed levels, it scales assistance to how hard you pedal — gentle for control, surging for power — so you rarely need to change modes on the trail.
Yes. The Bosch Flow app adds Range Control, custom motor tuning by riding style, route planning with live data, an eBike Lock digital key and automatic over-the-air software updates.