Highlights based on this e-bike’s specs, comparisons and practical strengths.
100
Excellent battery capacity
Battery capacity is high compared with similar e-bikes.
Battery capacity is high compared with similar e-bikes.
The listed battery capacity is large in absolute terms.
97
Excellent removable battery practicality
The removable battery makes charging, storage and battery handling more flexible.
The removable battery makes charging, storage and battery handling more flexible.
This bike type can be larger or heavier, so a removable battery adds useful charging flexibility.
Because the bike is heavier than average, removing the battery can make handling and charging more convenient.
The larger battery capacity makes removable charging more useful for day-to-day convenience.
The longer charging time makes it more useful to charge the battery separately from the bike.
94
Excellent rider information and controls
The included display or control unit should give useful ride information and control.
The included display or control unit should give useful ride information and control.
Multiple ride modes should give the rider more control over assistance levels.
Torque and cadence sensing should improve how precisely the bike responds to rider input.
Built-in lights add useful everyday control and visibility integration.
93
Very well-equipped for daily use
Built-in lights add useful everyday practicality.
Built-in lights add useful everyday practicality.
The included display or control unit adds useful ride information for daily use.
A removable battery makes daily charging and storage more flexible.
Multiple ride modes should help adapt the bike to different everyday journeys.
Hydraulic disc brakes are useful equipment for confident daily riding.
Payload capacity is average or better, which helps with bags, shopping or daily kit.
90
Excellent braking confidence
Hydraulic disc brakes should provide strong and controlled stopping power.
Hydraulic disc brakes should provide strong and controlled stopping power.
The brake specification mentions four-piston brakes, which should improve stopping power and control.
89
Excellent off-road capability
The mountain bike design should be well suited to off-road riding.
The mountain bike design should be well suited to off-road riding.
Front suspension should help absorb bumps on rougher surfaces.
Hydraulic disc brakes should help with control on loose or uneven terrain.
Torque is strong compared with similar e-bikes, which should help on loose or uneven climbs.
The 29-inch wheel size should help rollover and stability on rougher terrain.
89
Excellent built-in lighting
Built-in lights are included, which is useful for commuting and low-light riding.
Built-in lights are included, which is useful for commuting and low-light riding.
The display or control unit may make light and ride-status management easier.
Battery capacity is average or better for this type of e-bike, supporting everyday powered accessories.
87
Excellent smooth power delivery
Torque and cadence sensing should help the motor deliver more natural and controlled assistance.
Torque and cadence sensing should help the motor deliver more natural and controlled assistance.
Multiple ride modes should help riders choose a smoother level of assistance.
The included display or control unit should make it easier to manage assistance levels.
85
Excellent for longer rides
Range is high compared with similar e-bikes, which is one of the strongest signs it should suit longer rides.
Range is high compared with similar e-bikes, which is one of the strongest signs it should suit longer rides.
Battery capacity is strong compared with similar e-bikes.
Battery efficiency appears broadly average.
The removable battery can make charging easier during longer days or multi-stop rides.
Charging time is longer than average, which may be less convenient for back-to-back longer rides.
The display or control unit should make it easier to monitor assistance and battery use on longer rides.
85
Excellent technical trail control
The mountain bike design is well suited to technical trail control.
The mountain bike design is well suited to technical trail control.
Front suspension should help with control over roots, bumps and rougher sections.
Hydraulic disc brakes should provide the control needed for technical trail riding.
The brake specification mentions four-piston brakes, which should improve control on steeper or rougher trails.
The 29-inch wheel size should help rollover and stability on technical terrain.
Torque is above average for this type of e-bike.
Torque-sensing assistance should help with smoother control on technical sections.
The bike is heavier than average for its type, which may affect technical handling.
Multiple ride modes should help the rider manage assistance on technical trails.
Overview
The CUBE Reaction Hybrid SLX 800 FE is a mountain bike designed for trail riding, offering a smooth and controlled power delivery that feels natural on varied terrain. With a high-capacity battery and a removable design, it provides flexibility for charging and storage, making it a good choice for longer rides. Hydraulic disc brakes offer confident stopping power, while the aluminium frame and front suspension keep the bike responsive and durable. However, its 250W motor may feel less punchy when accelerating, and the bike's weight makes it slightly harder to lift, which could be a consideration for those needing frequent portability.
Best For
✓
This mountain e-bike should suit riders who want a capable trail companion with strong battery performance and reliable off-road handling. Its high battery capacity and smooth power delivery make it a solid choice for longer rides on varied terrain, while the hydraulic disc brakes and front suspension add confidence on rough trails. Riders who value flexibility, such as the ability to charge the battery away from the bike, will also appreciate its practical design.
Who Should Avoid It
×
Riders seeking the most aggressive motor punch or faster charging times may be better served by alternatives. The motor power is below average for similar mountain e-bikes, which could affect acceleration and performance on technical trails, and the charging time is notably slower compared to rivals. However, the bike still offers strong battery capacity, confident braking, and good off-road capability for riders prioritising range and control over speed and charging convenience.
Ownership considerations
These points highlight practical ownership factors such as maintenance, storage, charging, everyday
handling and bad-weather usability.
43
Some maintenance considerations
Weak
Chain drive is common and serviceable, but needs more cleaning and lubrication than a belt drive.
Chain drive is common and serviceable, but needs more cleaning and lubrication than a belt drive.
Hydraulic disc brakes are a strong everyday setup, though they may need occasional specialist servicing.
A removable battery makes charging, storage and battery care easier.
Tyres are listed, but there is no clear puncture-protection signal.
The aluminium frame material is practical for everyday use and general maintenance.
Built-in lights reduce the need to manage separate lighting accessories.
The mountain bike format may involve more wear from rougher riding and more complex components.
A higher number of gears can add drivetrain complexity.
0
Limited storage practicality
Poor
The frame does not appear to fold, so storage will depend more on size and weight.
The frame does not appear to fold, so storage will depend more on size and weight.
The bike is heavier than average for its type, which may make storage and moving it harder.
The removable battery can make storage and indoor charging more flexible.
15
Harder to lift
Poor
The bike is heavier than average for its type, so it may not be especially easy to lift.
The bike is heavier than average for its type, so it may not be especially easy to lift.
The listed weight is 24.7 kg.
The aluminium frame material is a practical lightweight choice for many e-bikes.
The removable battery can reduce the weight when lifting or moving the bike.
The mountain bike format can be bulkier and harder to lift than simpler urban e-bikes.
The 29-inch wheel size can make the bike more awkward to lift or store.
The larger-than-average battery capacity may add weight.
97
Excellent removable battery practicality
Excellent
The removable battery makes charging, storage and battery handling more flexible.
The removable battery makes charging, storage and battery handling more flexible.
This bike type can be larger or heavier, so a removable battery adds useful charging flexibility.
Because the bike is heavier than average, removing the battery can make handling and charging more convenient.
The larger battery capacity makes removable charging more useful for day-to-day convenience.
The longer charging time makes it more useful to charge the battery separately from the bike.
0
Very slow charging speed
Poor
Charging time is high compared with similar e-bikes.
Charging time is high compared with similar e-bikes.
The quoted charging time is long in absolute terms.
29
Low battery efficiency
Poor
Battery efficiency appears average for this type of e-bike.
Battery efficiency appears average for this type of e-bike.
The calculated range per battery unit is 93.75.
93
Very well-equipped for daily use
Excellent
Built-in lights add useful everyday practicality.
Built-in lights add useful everyday practicality.
The included display or control unit adds useful ride information for daily use.
A removable battery makes daily charging and storage more flexible.
Multiple ride modes should help adapt the bike to different everyday journeys.
Hydraulic disc brakes are useful equipment for confident daily riding.
Payload capacity is average or better, which helps with bags, shopping or daily kit.
75
Good bad-weather practicality
Good
Hydraulic disc brakes should provide better control and confidence in wet conditions.
Hydraulic disc brakes should provide better control and confidence in wet conditions.
Built-in lights are useful for rain, low light and darker commutes.
The mountain bike format should offer useful control on rough or slippery surfaces.
Suspension can help control and comfort on rough, wet or uneven surfaces.
The bike weight may help it feel more planted in wet or windy conditions.
The wheel size should be workable for regular poor-weather riding, depending on tyre choice.
Frame material is listed as aluminium, which gives useful durability and maintenance context.
47
Some family utility limitations
Weak
Payload capacity is average for this type of e-bike.
Payload capacity is average for this type of e-bike.
The listed maximum payload is practical for lighter utility use.
The listed maximum payload is 125 kg.
Hydraulic disc brakes are useful when carrying children, shopping or heavier loads.
Built-in lights are useful for school runs, errands and daily utility riding.
A removable battery makes charging easier around family or utility use.
Battery capacity is strong compared with similar e-bikes, supporting utility trips.
Range is average or better compared with similar e-bikes, which supports practical daily use.
Where to buy
Priced at £3,499, the CUBE Reaction Hybrid SLX 800 FE offers a favourable position against similar 2025 mountain e-bikes, with strong range and battery capacity supporting its value. While it provides reliable performance for off-road use, its charge time is slightly slower than some competitors, which may be a consideration for riders prioritising speed and convenience.
Compared with similar mountain bike e-bikes on Bikkerr, this model sits £1,804.41 below average
The CUBE Reaction Hybrid SLX 800 FE is listed at £3,499, which sits comfortably against similar mountain e-bikes from 2025, offering a price that feels reasonable for the features included. It compares well with rivals in terms of range and battery capacity, and the strong torque support should help riders tackle hills and rough terrain with confidence. However, some similar e-bikes may feel more responsive for their weight, and the 6.5-hour charge time is a bit slower than what some competitors offer. For a mountain e-bike focused on trail performance and reliability, the balance of power, range, and braking makes this a solid option, especially for those prioritising control and battery life over speed and charging convenience. Riders who value a dependable, well-rounded package for off-road use are likely to see the value in this bike, while those seeking the fastest acceleration or shortest charge times may find more suited alternatives.
We reach this value score by combining the bike’s price, specification, performance data and comparison against similar e-bikes in our database.
64
The listed price is GBP 3,499.
The bike appears to save around GBP 1,164 versus the average.
Range is strong compared with similar e-bikes.
Battery capacity is strong compared with similar e-bikes.
350W more powerSame range0 Ah less battery1 kg heavierSame gears
Potential limitations
Areas where this e-bike may be less strong based on its specs and comparisons.
0
Limited motor punch
Motor power is low compared with similar e-bikes.
Motor power is low compared with similar e-bikes.
Torque is above average for this type of e-bike.
Power-to-weight is low.
Torque-sensing assistance should make the motor response feel more natural.
The bike is heavier than average for its type.
The calculated power-to-weight score is 10.12.
0
Not ideal for steep hills
Torque is above average for this type of e-bike.
Torque is above average for this type of e-bike.
Power-to-weight is low.
Motor power is low compared with similar e-bikes.
The torque-sensing assistance should help the bike respond more naturally on climbs.
The bike has 10 or more gears, which should help on varied climbs.
The bike is heavier than average for its type.
The calculated power-to-weight score is 10.12.
0
Low power-to-weight ratio
Power-to-weight is low compared with similar e-bikes.
Power-to-weight is low compared with similar e-bikes.
Motor power is low compared with similar e-bikes.
The bike is heavier than average for its type.
The calculated power-to-weight score is 10.12.
0
Limited storage practicality
The frame does not appear to fold, so storage will depend more on size and weight.
The frame does not appear to fold, so storage will depend more on size and weight.
The bike is heavier than average for its type, which may make storage and moving it harder.
The removable battery can make storage and indoor charging more flexible.
0
Very slow charging speed
Charging time is high compared with similar e-bikes.
Charging time is high compared with similar e-bikes.
The quoted charging time is long in absolute terms.
12
Limited commuting practicality
The mountain bike format is less commuting-focused and may be less efficient for daily urban use.
The mountain bike format is less commuting-focused and may be less efficient for daily urban use.
Range is average or better compared with similar e-bikes, which supports commuting practicality.
Charging time is longer than average, which may be less convenient for daily use.
Built-in lights are useful for commuting and low-light riding.
A removable battery makes home, office or indoor charging easier.
The display or control unit should make it easier to monitor assist level and battery use.
Hydraulic disc brakes are a strong practical feature for daily riding.
Payload capacity is average for this type of e-bike.
The bike is heavier than average for its type, which may make daily handling less convenient.
15
Harder to lift
The bike is heavier than average for its type, so it may not be especially easy to lift.
The bike is heavier than average for its type, so it may not be especially easy to lift.
The listed weight is 24.7 kg.
The aluminium frame material is a practical lightweight choice for many e-bikes.
The removable battery can reduce the weight when lifting or moving the bike.
The mountain bike format can be bulkier and harder to lift than simpler urban e-bikes.
The 29-inch wheel size can make the bike more awkward to lift or store.
The larger-than-average battery capacity may add weight.
29
Low battery efficiency
Battery efficiency appears average for this type of e-bike.
Battery efficiency appears average for this type of e-bike.
The calculated range per battery unit is 93.75.
E-system & battery comparison
Motor Power
250 watts
▼ 190 W below average
Motor Torque
85 Nm
▲ 6.5 Nm above average
Power-to-weight
10.12 W/kg
▼ 10 W/kg below average
Battery Capacity
800 Wh
▲ 169 Wh above average
Claimed Max Range
75 miles
▲ 14 miles above average
Charge Time
6h 30m
▲ 75 mins slower than average
Sensor Type
Torque and Cadence Sensor
Removable Battery
Yes
Motor Name
Bosch Performance Line CX Generation 5 (BDU 38)
This mountain e-bike offers a balanced motor assistance that should feel natural and predictable on trails, with strong torque support to help with climbing and low-speed control on rough terrain. Next to similar models, it provides a solid level of assistance but may feel slightly less punchy or lively compared to some heavier, more powerful e-bikes in the same category. The torque and cadence sensor should help maintain smooth power delivery, especially on technical trails or when accelerating out of corners. Riders looking for a well-rounded mountain e-bike with good range and predictable assistance may find this setup suits their needs, particularly if they prioritize trail control and longer rides over maximum motor punch.
This explanation is based on the bike’s motor power, torque, battery capacity, claimed range, charging
time, sensor type and how those figures compare with similar e-bikes in our database.
eBike FAQs
Is this bike suitable for long off-road rides?
This bike is well-suited for long off-road rides, thanks to its high battery capacity and strong hydraulic disc brakes, which provide confident stopping power on rough terrain. The mountain bike design and front suspension also contribute to a comfortable and stable ride over varied trails. However, the 250W motor may feel less punchy when accelerating, and the bike's weight could make it slightly harder to lift and carry, which might be a consideration for frequent portability needs.
How does the motor perform when climbing steep trails?
The motor should provide smooth and controlled assistance when climbing steep trails, but its 250W power may feel less punchy when accelerating. With above-average torque, it should handle moderate climbs reasonably well, though steeper trails might require more effort. The bike's weight could also make it slightly harder to maneuver on very steep or technical terrain.
Does the battery last long enough for multi-day adventures?
The CUBE Reaction Hybrid SLX 800 FE has a high battery capacity of 800 watt-hours, which should provide a range of around 75 miles on a single charge. This makes it well-suited for multi-day adventures, especially when combined with the removable battery design, which allows for easy charging and storage. However, the battery efficiency is average for this type of e-bike, so you may need to plan charging stops depending on your riding conditions and terrain.
How practical is the removable battery for charging and storage?
The removable battery is very practical for charging and storage, as it allows you to easily take the battery indoors to charge it without needing to carry the whole bike. This is especially useful if you're riding in remote areas or want to keep your bike dry and secure. The high battery capacity also means you can ride longer before needing to recharge, which is a big plus for trail riders.
Is this bike good value for the price compared to similar e-bikes?
The CUBE Reaction Hybrid SLX 800 FE offers a high battery capacity and strong braking, which are valuable for mountain biking. However, its 250W motor and lower power-to-weight ratio may feel less responsive compared to more powerful e-bikes in its category. While the range is impressive, the slower charging time and heavier weight could be drawbacks for some riders. Overall, it's a solid choice for off-road enthusiasts who prioritize battery life and braking confidence over quick acceleration and portability.
How comfortable is the ride on rough or uneven terrain?
The CUBE Reaction Hybrid SLX 800 FE should handle rough or uneven terrain reasonably well, thanks to its mountain bike design and front suspension, which should help absorb some of the shocks from rough trails. However, the 250W motor may not provide the strongest acceleration, and the bike's weight could make it feel less nimble on very technical or rocky terrain. Hydraulic disc brakes should give you confident stopping power, which is important when navigating unpredictable surfaces.
What are the main limitations of this bike’s motor and performance?
The bike's 250W motor may feel less punchy when accelerating, especially on steep or technical trails. While the torque is above average, it may not provide the same level of power as higher-wattage motors, which could affect performance in more demanding conditions. The bike's weight of 24.7 kg also makes it slightly harder to lift or carry, which might be a consideration for riders who need to transport it frequently.
How does the weight of the bike affect its handling and portability?
The CUBE Reaction Hybrid SLX 800 FE weighs 24.7 kg, which is above average for a mountain e-bike. This weight can make the bike feel less nimble on technical trails and slightly harder to lift when carrying it, especially if you need to move it frequently. However, the aluminium frame and front suspension help manage the weight, keeping the ride stable and comfortable over rough terrain.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2025
The bike was released 1 years ago
Screen
Unknown
Lights Included
Yes
Weight (inc battery): 24.7 kg
The website average for electric bikes is
23.82 kg.
This electric bike is 0.87 kg over the average. Total bike weight may vary depending on frame size.
The Reaction Hybrid SLX FE's full equipment package – including full-length mudguards, carrier, kickstand and integrated lighting system – means it's up for any challenge from a long weekend tour to the daily commute.
The Reaction Hybrid SLX FE's full equipment package – including full-length mudguards, carrier, kickstand and integrated lighting system – means it's up for any challenge from a long weekend tour to the daily commute.
