The German motor producer has unveiled the most recent technology of the Bosch Efficiency Line CX motor. Whereas at first look, not a lot has modified on the paper, the brand new motor is crammed with technical improvements that make a noticeable distinction. We’ve put the 2025 Bosch CX Motor via the wringer to inform you why Bosch will quickly be whisper quiet!
For the reason that launch of the primary Bosch Efficiency Line CX motor in 2015, Bosch have constantly labored on enhancing the drive’s efficiency, integration, and using modes. The 4th technology Efficiency Line CX rapidly set a benchmark within the e-mountain bike scene and solidified its place because the business chief in a number of of our huge E-MOUNTAINBIKE comparability exams. For years, Bosch has topped our E-MOUNTAINBIKE reader survey, often called the world’s main producer of e-bike motors.
Bosch persistently deal with a closed system, optimizing the ecosystem consisting of the motor, battery, and management unit to make sure seamless integration. The newest overhaul of the CX drive unit was in 2022. With the fifth technology of their motor, Bosch deal with fine-tuning, notably enhancing responsiveness, sensitivity, and noise ranges. What new options does the Bosch Efficiency Line CX motor have, and the way does it carry out intimately? Discover out in our check.
The 2025 Bosch Efficiency Line CX intimately – What’s new with the Bosch e-Bike motor?
On this article, we’ll summarize the high 5 improvements of the brand new Bosch Efficiency Line CX motor, which make it not solely smarter and quieter but additionally extra highly effective. Listed below are the highlights!
1. Much less weight, higher integration
At first look, the fifth technology of theBosch Efficiency Line CX appears nearly an identical to its predecessor, however the true enhancements are within the particulars, primarily within the mounting factors. Bosch decreased the variety of mounting factors from 4 to 2. In consequence, the motor shouldn’t be solely 100 grams lighter, at round 2.8 kg, but additionally simpler to combine into frames. This design improve will probably please bike producers, because it offers them extra flexibility with body designs. Fewer mounting factors additionally imply simpler and quicker motor alternative throughout service – a transparent benefit for each workshops and riders alike. This adjustment brings the CX motor in keeping with its smaller sibling, the Efficiency Line SX, which additionally options simply two mounting factors. Because of the an identical mounts, each the CX and SX motors will be put in in the identical frames.
2. Quieter experience
For those who take a look at the tech spec, the core technical specs stay unchanged, that means that the most recent technology of the Bosch Efficiency Line CX motor’s nonetheless delivers 85 Nm of torque, 600 watts peak energy, offering as much as 340% help. Although it might seem to be little has modified, the enhancements lie within the particulars: one of the vital important improvements issues the drivetrain. Bosch have decoupled the exterior drivetrain (chain, chainring, cassette) from the interior drivetrain (freewheel, gearbox, motor). This measure goals to deal with the mechanical noises of its predecessor, considerably decreasing the noise ranges and due to this fact making certain a extra nice using expertise.
3. Smarter than earlier than
The motor’s software program has been optimized too. Bosch have reinterpreted the sensor alerts collected from inertial sensors, cadence sensors, and pace sensors. The inertial sensor measures acceleration and rotation in six dimensions, detecting incline and tilt angles in addition to vibrations. The motor makes use of this knowledge to fine-tune assist to the precise using state of affairs, making the motor smarter and extra conscious of what’s taking place on the path, dynamically delivering the proper degree of assist.
4. New options, improved capabilities
Bosch additionally added new options to the brand new motor and improved the prevailing ones, which is principally because of the newly interpreted sensors. The built-in stroll help, which will be activated by holding the minus button, has been optimized too. The motor now adjusts its pace to match the rider’s strolling tempo as a substitute of pushing constantly on the identical pace. The beforehand out there hill maintain operate, which prompts when releasing the minus button throughout stroll help, prevents the eMTB from rolling backward. Whereas the hill maintain operate is energetic, you should use the + and – buttons to both flip off the operate or prolong it by one other 10 seconds.
Hill begin is a brand new function that’s designed to facilitate uphill begins Right here, the motor responds extra on to pedal enter, stopping the rear wheel from spinning uncontrolled. If you put your foot on the pedal and apply some stress, the motor instantly begins offering help, serving to you begin on steep sections with out having to rely solely by yourself energy for the primary second.
5. Keep cool!
No extra overheating! Bosch additionally improved thermal administration. The motor now generates much less warmth, that means that it gained’t go into derating mode (decreased energy output to keep away from overheating) as rapidly. This can be particularly noticeable on lengthy climbs – full energy with out pressured breaks. Whereas we by no means skilled severe overheating points with the earlier technology of the Bosch Efficiency Line CX motor, this enchancment ensures that the drive delivers its most energy extra persistently, even underneath the harshest circumstances.
The sportive ecosystem of the Bosch Efficiency Line CX – totally different battery capacities, new show, and connectivity.
The brand new Bosch batteries: PowerTube 600 and PowerTube 800
Bosch additionally launched two new batteries, the PowerTube 600 and PowerTube 800, which differ in capability and weight. The PowerTube 600 supplies 600 Wh, whereas the PowerTube 800 affords the best power density in Bosch’s portfolio at 800 Wh. The load distinction is round 900 grams, with the smaller PowerTube 600 weighing roughly 3 kg and the PowerTube 800 round 3.9 kg. Each batteries and the motor are a part of Bosch’s Sensible System, enabling seamless integration and improved connectivity between the elements.
The particular function of those batteries is that they’re the identical size and solely differ in thickness. This enables bike producers to make use of each variations in the identical body with out having to alter the general body design. all they need to do is adapt the battery cowl to the respective battery. Each batteries can be utilized for dual-battery setups, that means they are often paired with a further battery or the 250 Wh PowerMore vary extender. This ensures most flexibility, permitting riders to extend the bike’s vary.
The brand new silver Bosch PowerTube batteries change the earlier black model, which has a sensible motive past aesthetics. Bosch are lowering materials utilization by not including the ultimate paint layer, saving weight – a nod to the “Silver Arrow” nickname – and enhancing the batteries’ recyclability. Additionally new: Bosch are utilizing higher-capacity 2170 cells of their new batteries as a substitute of the 1865 cells beforehand used. These bigger cells supply larger power density and effectivity, leading to longer ranges and shorter charging occasions.
The brand new Bosch Purion 400 show
One other new function is the Bosch Purion 400 show, a compact 1.6-inch coloration show that’s related to the system with a cable. Because of the minimalist design, the show matches properly into the cockpit. Relying on the bike’s design and cockpit setup, the show will be mounted straight on the stem or as a spacer if the mount is offered. In any other case, it sits securely, hooked up to the aspect of the stem by a clamp simply behind the handlebars.
Moreover, the Purion 400 is appropriate with the Bosch LED Distant and System Controller. Nevertheless, the Purion 400 show lacks fundamental navigation and the e-Bike Lock operate, which stay unique to the Kiox 300 and 500 shows, in addition to the Bosch Nyon show.
Extra options and the brand new Bosch ABS Professional
Routes will be deliberate by way of the well-organized eBike Circulate app, which stays a part of the motor system within the new Bosch Efficiency Line CX. Right here, all using modes will be customised primarily based on most torque, dynamics, assist energy, and pace. The Bosch Efficiency Line CX continues to be appropriate with Bosch ABS and the brand new Bosch ABS Professional. We’ve additionally examined the brand new Bosch ABS Professional on our native trails and through two weeks within the Alps. You’ll be able to learn our full check right here!
Silent revolution – The brand new Bosch Efficiency Line CX motor on the path
Using uphill, the brand new Bosch Efficiency Line CX assists you with 4 assist modes (Eco, Tour+, eMTB, and Turbo), relying on the bike producer. The motor feels acquainted from the get go,as a result of its using traits haven’t modified a lot in comparison with its predecessor.
The Eco mode is primarily used for saving battery energy. Tour+ and eMTB are dynamic using modes that routinely modify the facility primarily based on the rider’s enter and terrain. Tour+ is the much less aggressive various to the extra highly effective eMTB mode and is right for easy rides on assorted terrain. The extra highly effective eMTB mode, however, supplies a extra delicate response to pedal pressure. When the climb will get steeper and extra technical, the distinction in response, notably in eMTB mode with Prolonged Enhance, turns into obvious. Mild pedal strokes are supported with refined help, whereas tougher stress on the pedals leads to noticeable, but well-controlled help.
Because of Prolonged Enhance – that means longer override – the motor supplies additional assist when negotiating obstacles and tough terrain. Turbo mode, nonetheless, delivers most help assist of 340%, enabling fast progress on steep climbs, albeit at the price of battery life and the chance of rear-wheel spin on free surfaces. The eMTB mode, in contrast, affords higher energy modulation, offering extra management on technical climbs.
What instantly stands out – or quite, what doesn’t – is the considerably quieter background noise, even in Turbo mode when using at excessive cadence in low gears. Bosch have decreased the noise degree considerably, making certain the motor stays pleasantly quiet even at most assist.
The Bosch Efficiency Line CX motor was once absolutely the chief when it comes to cadence vary and supplied dependable assist even in less-than-optimal gears. Nevertheless, different producers have caught up, providing motors that carry out much more persistently in such conditions. Whereas the CX nonetheless performs very properly, you’ll discover that on steep climbs it might probably wrestle to take care of momentum with full energy when using in a heavy gear. In a gear that’s too gentle, the motor spins up rapidly, resulting in frequent shifting, which disrupts circulation, particularly on technical trails. This doesn’t imply that the CX obtained worse, however that the competitors has made important advances. New motors can adapt extra flexibly to totally different cadences and supply secure assist even in suboptimal gears. However extra on that in our complete motor check.
Using downhill, the Bosch Efficiency Line CX showcases certainly one of its largest improvements: decreased noise ranges. Bosch has made important progress right here by decoupling the exterior drivetrain (chain, chainring, cassette) from the interior drivetrain (freewheel, gearbox, motor). This has drastically decreased the mechanical noises that beforehand precipitated disturbances throughout descents. Prime marks for this enchancment!
How does the brand new Bosch Efficiency Line CX evaluate to its predecessor?
The brand new Bosch Efficiency Line CX motor brings a number of necessary adjustments in comparison with the earlier mannequin. One of the crucial noticeable improvements are the less mounting factors, which have been decreased from 4 to simply two, making the motor lighter and simplifying integration into varied body designs. One other enchancment is the improved sensor system: the motor now interprets knowledge like cadence, pace, and incline much more precisely, leading to extra dynamic assist.
The brand new thermal administration system prevents the motor from overheating rapidly throughout lengthy climbs, making certain constant full energy. Moreover, the brand new Hill Begin function makes it simpler to set off on a gradient, and Hill Maintain and stroll help have been revised – stroll help now routinely adjusts to the strolling pace. One other enchancment is the decrease noise degree. By decoupling the drivetrain, mechanical noises, particularly on descents, have been considerably decreased, making for a a lot quieter using expertise general.
E-Mountainbikes with Bosch Efficiency Line CX: probably the most fascinating fashions
With a brand new Bosch motor normally come a lot of thrilling new eMTBs, and this time is not any totally different. We’ve already examined a number of totally different eMTBs that depend on the brand new 2025 Bosch Efficiency Line CX motor. We’ve put them to the check in a wide range of epic spots, from the majestic Dolomites in Italy to the Vosges in France and all the way in which to Santa Cruz in California. Right here’s an summary and the hyperlinks to the person check stories:
BULLS SONIC EN-R Group
100% E-MTB race efficiency – that’s how BULLS are advertising and marketing the brand new SONIC EN-R Group. It depends on a mullet wheel setup – 29″ on the entrance,27.5″ on the rear – and generates 170/160 mm of journey. BULLS additionally packed in additional options alongside the brand new Bosch Efficiency Line CX motor.
Click on right here to seek out out what these options are!
FOCUS JAM² 6.0
24.3 kg in dimension L | € 7,999 | Producer’s web site
The brand new FOCUS JAM² goals to enhance on many fronts over its predecessor. It comes outfitted with a model new Bosch Efficiency Line CX motor and generates 160/150 mm (f/r) of journey. Furthermore, it permits for a variable battery system. However how does the brand new FOCUS JAM² with an aluminum body and an interesting worth of €7,999 carry out on the paths?
Learn the total assessment to seek out out!
GHOST E-RIOT LTD
24.1 kg in dimension L | € 10,000 | Producer’s web site
The brand new GHOST E-RIOT stands out with a sporty, glossy look and is marketed by the German model as a “bike for the acute.” The important thing specs – 170/160 mm suspension journey, the brand new Bosch CX motor, and 800 Wh battery capability – are promising. However can the E-RIOT reside as much as its promise on the path?
Learn the total check right here!
Haibike ALLTRAIL Low 10.5 ABS
(f/r) | 26.2 kg in dimension L | € 6,299 | Producer’s web site
A step-through path eMTB? That’s proper! Haibike wish to mix all some great benefits of a step-through body with path efficiency with their AllTrail Low, which generates 140/130 mm of journey and comes outfitted with the brand new Bosch Efficiency Line CX motor. We’ve examined whether or not this idea works.
Click on right here for the primary check of the AllTrail!
Santa Cruz Vala
21.5 kg in dimension LA | € 11,499 | Producer’s web site
Santa Cruz go Bosch! With the Santa Cruz Vala, the Californian bike producer unveils its first eMTB with a Bosch motor. It comes outfitted with a model new Bosch Efficiency Line CX motor, 600 Wh battery, counting on a mullet wheel setup and 160/150 mm of journey to ship Santa Cruz’s famend experience qualities. With its recent look and new rear suspension idea, the Vala brings a breeze of recent air into Santa Cruz’s e-bike portfolio.
However how does it fare on the path? Discover it out!
Alongside the AllTrail, Haibike additionally launched their new AllMtn and ADVENTR fashions. Try our information article for a short overview.
Trek launched two new eMTBs with the brand new Bosch Efficiency Line CX motor too. You’ll find extra information about them right here!
Conclusions concerning the 2025 New Bosch Efficiency Line CX Motor
Bosch have optimized many key features of the CX motor: the improved sensor know-how, higher responsiveness, and decoupled drivetrain make the brand new Bosch motor smarter, quieter, and extra intuitive to experience. In eMTB mode, it responds notably sensitively, adjusting the assist seamlessly for a pure using expertise. With the decreased noise degree, it lastly feels as if the years of building noise with jackhammers have ended – and now you can take pleasure in peace and quiet in your individual house. 😉
Tops
- Quiet on descents
- Highly effective assist
- Delicate response in eMTB mode
- Excessive degree of connectivity
Flops
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Phrases: Benedikt Schmidt Photographs: Benedikt Schmidt, Manfred Schmitt
