This article is part of our big 2026 motor group test. Click here to read about all 11 systems we tested, discover the latest trends and dive into detailed results from both the lab and real-world testing.
Introduced in 2022, the Shimano EP8 (DU-EP801) has steadily lost ground in the market over the past few years. In our 2023 group test, eight bikes featured Shimano motors. Fast forward to 2025, and that number has dropped to just four – just 13.3% of the 30 bikes in our test ran a motor from the Japanese giant. And what about 2026? Things aren’t likely to improve. We set out to uncover the reasons behind this downward trend and to find out whether the EP8 is still a competitive option.
The Shimano EP8 in detail – Familiar versatility
The current flagship model from the Japanese manufacturer goes by the name EP8 and, under the model code DU-EP801, represents the second iteration of this motor system. It’s largely based on its predecessor, the DU-EP800. The DU-EP801 delivers a higher peak output of 600 instead of 500 watts, and the second-generation EP8 is designed to provide powerful support across a wider cadence range – although the maximum torque remains unchanged at 85 Nm.
One key difference in the latest EP8 version is a connectivity feature: when paired with Shimano’s Di2 drivetrains, it enables FREE SHIFT and AUTO SHIFT functionality. FREE SHIFT allows for manual or automatic gear changes while coasting – even without pedalling. AUTO SHIFT takes things a step further by shifting gears automatically under any condition, including while pedalling. Both features are especially useful in everyday riding scenarios, ensuring additional comfort and convenience.
Thanks to its magnesium casing, the Shimano EP8 weighs just 2.68 kg, which makes it lighter than the drive units from Bosch and Specialized, though heavier than the more powerful MAHLE M40 and Avinox M1 motors. There’s also a variant called the EP8 RS, which is used exclusively on the Orbea Rise. Despite the “RS” label, it’s actually a detuned version with torque reduced from 85 to 60 Nm.
When it comes to batteries, the EP8 system is notably flexible: Shimano officially permit the use of third-party batteries and offers their own 504 Wh and 630 Wh variants. For longer rides, capacity can be increased using a 250 Wh range extender. A full charge of the 626 Wh battery takes around four hours – that’s a charging rate of 2.7 Wh/min, which places it comfortably in the middle of the pack.
While the motor hardware still feels up to date, the control units don’t always measure up to the more refined options offered by the competition. The SC-E5003 remote remains one of the most common setups, but feels bulky, and features an imprecise LED battery indicator – not to mention the disappointingly awkward power button. Alternatives include the much more compact EM800-L remote and the discreet EW-SW310 power switch integrated into the top tube – both of which are far more ergonomic and modern.
As for displays, Shimano’s range includes the SC-EM800 colour model and the simpler SC-EN600 variant. Both are well protected behind the stem and easy enough to read, but in resolution and data depth, they’re clearly a step behind the newer systems from Avinox or TQ.
From the factory, you get three support modes – ECO, TRAIL and BOOST – all of which can be customised via the E-TUBE PROJECT Cyclist app. Shimano provide two configuration options: the user-friendly Basic Mode, which lets you adjust power, support character and responsiveness for all three modes. Riders who want more control can switch to Fine-Tune Mode. This unlocks 15 finely graded support levels and a wide range of parameter mapping options – but it does take some time to get familiar with and is clearly geared toward riders who enjoy optimising their motor setup down to the last detail.
What the app doesn’t offer, however, is navigation. For that, you’ll need the separate E-TUBE RIDE app, which has to be installed alongside. Planned routes also can’t be transferred to the bike’s display – so without a phone mount or a smartphone in your pocket, you’ll be out of luck.
All in all, the EP8 remains a motor that gets a lot of things right in terms of functionality, but when it comes to details, it clearly shows that the competition now delivers a much more modern user interface and app experience.
| Parameter | Our measurement | Manufacturer’s spec |
|---|---|---|
| Motor weight (kg) | 2.681 kg | 2,7 kg |
| Battery capacity (nominal, Wh) | 583.2 Wh | 626 Wh |
| Charge time (0–100%) | 4 h | – |
| Support ratio (%) | 325 % | 410 % |
| Max power output (W) | – | 600 W |
| Max torque (Nm) | – | 85 Nm |
| Range* (km) | 20.2 km | – |
| Vertical range* (metres climbed) | 1,595 hm | – |
*All values were measured on the same test track with an average incline of 8.5%, using the maximum support mode, a consistent rider output of 150 watts, rider weight of 72 kg, and standardised tyres: MAXXIS HighRoller (DD, MaxxGrip) up front and MAXXIS Minion DHR II (DD, MaxxTerra) on the rear.
The Shimano EP801 on test
The Shimano EP801 motor on the trail
On the trail, the Shimano EP801 proves a powerful companion. While it may feel slightly less punchy than the fifth-generation Bosch CX in a direct comparison, it still delivers more than enough support for virtually all (relevant) riding scenarios. In tight switchbacks, the EP801’s smooth power delivery really comes into its own.
Cadence fluctuations are managed effectively, making it much easier to control the bike and giving even inexperienced riders with uneven pedal strokes a greater sense of confidence. On the downside, the cut-off at the 25 km/h threshold is rather abrupt and clearly noticeable. At very high cadences, power gaps can occur – the motor may briefly cut out entirely, leaving the rider hanging. While this isn’t a major issue in everyday use, it can make a difference on technical climbs, where the EP801 falls behind the top performers in this test.
The Shimano EP801 also shows weaknesses in terms of traction: on wet terrain, the rear wheel tends to spin out of control more quickly than with competing systems.
In terms of noise, the EP801 tends to rattle on descents. Depending on the frame and suspension design, this issue can be more or less pronounced – the Propain Sresh CF we tested, for example, remained pleasantly quiet.
The Shimano EP801 on the test bench
This motor did everything it could to avoid being measured. The electronics seemed to detect that current measurements were being taken, often shutting the motor down after just a few seconds of riding. Even after extensive cross-checking and error correction, the measured values should therefore be treated with caution. In its highest support mode, the EP8 kicks in hard even with very low rider input and reaches its stated maximum output. Support starts at a massive 893%, tapering off to a still-impressive 220% under higher loads.
During the 30-minute full-load endurance test, the Shimano EP801 showed a brief power drop of 80 watts after just over 10 minutes, then steadily declined to a meagre 100 watts by the end. The noise level reflects the motor’s high initial output: on flat terrain, the Shimano EP801 is the loudest motor in the test and has a distinctly tonal sound, making it stand out. On climbs and at slightly higher cadences, it still ranks toward the louder end of the mid-field, while retaining its tonal character.
Tuning tip for the manufacturer: Develop a better remote and display for the next generation, optimise traction control, eliminate downhill rattling, and expand the app’s feature set.
Who should take a closer look at the Shimano EP801 – and who should look elsewhere?
The Shimano EP801 is aimed at riders who value a natural, finely-tuned ride feel and intuitive control. It really shines in technical climbing sections with tight switchbacks, where it responds sensitively, forgives uneven cadence, and provides a sense of security even for less experienced eMTB riders.
It’s less suitable for riders who demand maximum power, uncompromising traction, and a modern control and display experience. Power gaps at high cadence, abrupt cut-off above the 25 km/h threshold and weaker performance in wet conditions may hold back ambitious e-enduro riders. The noticeable rattling noise when riding downhill, along with the outdated remote and display ergonomics, also make the motor less appealing for performance-focused users. If you’re chasing top-tier performance or regularly ride in demanding, slippery terrain, you’ll likely find more refined systems elsewhere.
Conclusions about the Shimano EP801 – The weaknesses lie in the details
The Shimano EP801 still delivers a well-rounded package with intuitive ride characteristics and handy features like automatic shifting when paired with Shimano’s in-house Di2 system. However, the EP801 doesn’t lead in any single category – and in the finer details, small but decisive shortcomings become apparent, particularly in the control and display interface and in traction, where the EP801 falls well behind the strong competition. To avoid losing further market relevance, it’s clear that new developments from Japan are urgently needed.
Tops
- Intuitive ride feel
- Strong pulling power
- AUTO and FREE SHIFT functions when used with Shimano Di2 shifting
Flops
- Power gaps at high cadence
- Outdated remote and display
- Rattling noise on descents
For more information, visit Shimano’s website.
The test field
For an overview of the test field head to Our big eMTB Motor Comparison – 15 eMTB Motors on Test
All motors in test:
Avinox M1, Bosch Performance Line CX Gen5, Bosch Performance Line CX-R, Bosch Performance Line SX, FAZUA Ride 60, Mahle M40, maxon Air S, Pinion MGU E1.12, Shimano EP801, S-Works 3.1, TQ HPR60
Words: Lars Engmann Photos: Peter Walker
