Torque and cadence sensing adds value by improving assist control and ride feel.
Built-in lights add practical everyday value.
A removable battery adds practical value for charging and storage.
The included display or control unit adds useful everyday value.
Suspension adds some component value for comfort or control.
The bike has 10 or more gears, which adds useful drivetrain range.
The bike appears to be a recent or current model.
The release age is recent, which supports value if pricing is competitive.
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.
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.
86
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 appears to include larger rotors, which can help braking power and heat management.
80
Good 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 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.
Multiple ride modes should help the rider manage assistance on technical trails.
78
Useful removable battery
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.
77
Good trail control
The mountain bike format should feel well suited to trail riding.
The mountain bike format should feel well suited to trail riding.
Front suspension should help the bike stay controlled over bumps and rougher paths.
Hydraulic disc brakes should improve control on loose or uneven trails.
The 29-inch wheel size should help rollover and stability on trails.
Torque is strong compared with similar e-bikes, which should help low-speed trail control.
Torque-sensing assistance should help with smoother power control on trails.
Overview
The Merida eBIG NINE 400 is a mountain bike designed for trail riding, offering smooth and controlled motor assistance that feels natural on rough terrain. Its 250W motor with 85Nm of torque provides enough power for most trails, though it lacks the punch of more aggressive e-bikes. Hydraulic disc brakes offer confident stopping power, and the removable battery adds convenience for charging and storage. While the bike's weight and battery efficiency are average for its category, it delivers solid value for money and performs well on off-road paths.
Best For
✓
This mountain e-bike should suit riders who enjoy trail riding and want a balance of off-road capability and comfort. Its hydraulic disc brakes, front suspension and responsive motor make it a solid choice for riders prioritising control and confidence on uneven terrain. The removable battery and decent range also make it appealing for those who need flexibility in charging and longer rides. Riders looking for a reliable, well-rounded mountain e-bike with good value for money may find this model particularly fitting.
Who Should Avoid It
×
Riders who prioritize aggressive trail performance or need strong motor punch for quick acceleration may want to compare alternatives. The motor power and torque are below average for similar mountain e-bikes, which could affect responsiveness on technical terrain. Additionally, the range is below average for this type of bike, so those planning long off-road rides may need to factor in more frequent charging. However, the bike still offers good value for money and confident braking, making it a solid choice for riders who prioritize reliability and smooth power delivery over maximum punch and range.
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.
7
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 removable battery can make storage and indoor charging more flexible.
24
Harder to lift
Poor
The bike weight is average for this type of e-bike.
The bike weight is average for this type of e-bike.
The listed weight is 23.5 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.
78
Useful removable battery
Good
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.
23
Very slow charging speed
Poor
Charging time is average for this type of e-bike.
Charging time is average for this type of e-bike.
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 87.3.
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.
49
Some family utility limitations
Weak
Payload capacity is above average for this type of e-bike.
Payload capacity is above average for this type of e-bike.
The listed maximum payload should be useful for family or utility riding.
The listed maximum payload is 150 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.
Where to buy
Priced at £2,750, the Merida eBIG NINE 400 looks favourably positioned against similar 2026 mountain e-bikes, offering a competitive balance of performance and features. Its value is supported by a strong component spec for the category, though potential trade-offs may relate to specific feature choices or build details.
Compared with similar mountain bike e-bikes on Bikkerr, this model sits £2,908.07 below average
The Merida eBIG NINE 400 is listed at £2,750, which sits comfortably against similar mountain e-bikes from 2026, offering a price that feels reasonable for the features included. It stands out with strong torque support and a generous payload capacity, both of which are important for off-road use, and the hydraulic disc brakes and front suspension add confidence and comfort on rougher trails. However, some similar e-bikes in the same category may offer a longer range or a more responsive ride for their weight, which could be a consideration for riders prioritising endurance or agility. For a mountain e-bike focused on trail comfort and control, the Merida eBIG NINE 400 makes a solid case for its price, especially if the rider values strong torque and payload capacity over maximum range. Riders who prioritise off-road capability and don’t need the longest possible range may find the value particularly appealing here.
We reach this value score by combining the bike’s price, specification, performance data and comparison against similar e-bikes in our database.
95
The price/value label suggests this bike is very strong value compared with similar options.
The listed price is GBP 2,750.
The bike appears to save around GBP 1,913 versus the average.
Torque is strong compared with similar e-bikes.
Payload capacity is strong compared with similar e-bikes.
Same power5 miles less range130 Wh less battery1 kg heavier1 more gears
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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 calculated power-to-weight score is 10.64.
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 calculated power-to-weight score is 10.64.
5
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 calculated power-to-weight score is 10.64.
7
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 removable battery can make storage and indoor charging more flexible.
23
Very slow charging speed
Charging time is average for this type of e-bike.
Charging time is average for this type of e-bike.
The quoted charging time is long in absolute terms.
24
Harder to lift
The bike weight is average for this type of e-bike.
The bike weight is average for this type of e-bike.
The listed weight is 23.5 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.
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 87.3.
33
Limited range-to-weight balance
Range is below average, so the range-to-weight balance is more limited.
Range is below average, so the range-to-weight balance is more limited.
The bike weight is average for this type of e-bike.
Battery efficiency appears broadly average.
The calculated range per kg is 2.34.
The calculated range per battery unit is 87.3.
E-system & battery comparison
Motor Power
250 watts
▼ 190 W below average
Motor Torque
85 Nm
▲ 6.5 Nm above average
Power-to-weight
10.64 W/kg
▼ 9.7 W/kg below average
Battery Capacity
630 Wh
▼ 0.9 Wh below average
Claimed Max Range
55 miles
▼ 5.5 miles below average
Charge Time
5h 30m
▲ 15 mins slower than average
Sensor Type
Torque and Cadence Sensor
Removable Battery
Yes
Motor Name
Shimano EP 6 (DU-EP 600)
This mountain e-bike offers legal-style pedal assist with strong torque support that should feel capable on climbs and low-speed rough terrain. Next to similar models, it may feel a bit more modest in outright motor punch and liveliness for its weight, but the torque and cadence sensing should help balance natural response with predictable assistance. The motor should provide solid climbing support and help maintain control on technical trails, though some similar e-bikes may feel more dynamic under heavy effort. The assistance should feel smooth and responsive, with ride modes that let riders adjust the level of support depending on the terrain. Riders looking for a reliable, well-controlled mountain e-bike that prioritizes trail confidence over maximum speed may find this motor setup well-suited to their needs.
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?
The Merida eBIG NINE 400 is well-suited for long off-road rides, thanks to its mountain bike design and hydraulic disc brakes, which provide confident stopping power on rough terrain. The 85Nm torque offers good trail control, though the 250W motor may feel less punchy on steep climbs. With a 55-mile range, it should handle most trail rides, but you may need to plan charging stops for longer adventures.
How does the motor perform when climbing steep trails?
The Merida eBIG NINE 400's 250W motor with 85Nm of torque provides enough assistance for most trails, but it may struggle on very steep inclines. While the torque is above average for this type of e-bike, the motor power is on the lower end, which could mean you'll need to pedal harder on steep sections. Hydraulic disc brakes offer confident stopping power, which is helpful when navigating technical climbs.
Is the battery capacity enough for a full day of mountain biking?
The 630Wh battery should provide enough range for a full day of mountain biking, depending on how aggressively you ride and the terrain you cover. With a range of around 55 miles, it's suitable for most trail rides, but if you're planning long, continuous climbs or riding in hilly areas, you may need to plan for mid-ride charging. The removable battery makes it easy to swap or recharge when needed, adding convenience for multi-day trips or extended rides.
How comfortable is the bike on rough terrain and trails?
The Merida eBIG NINE 400 is designed for trail riding and should feel comfortable on rough terrain, with a mountain bike frame and hydraulic disc brakes providing good control and stopping power. The 85Nm of torque helps with climbing and maintaining momentum on uneven trails, though the 250W motor may feel less punchy on very steep or technical sections. The average weight and battery efficiency mean it's suitable for most off-road adventures, but you may need to plan charging stops for longer rides.
Is this bike good value for money compared to similar e-bikes?
The Merida eBIG NINE 400 offers solid value for money, especially when considering its performance on trails and the features included. While it has a lower motor power compared to some competitors, the 85Nm of torque provides enough assistance for most off-road trails, and the hydraulic disc brakes offer reliable stopping power. The price point, combined with the removable battery and overall build quality, makes it a good choice for riders looking for a dependable mountain e-bike without breaking the bank.
How easy is it to charge and maintain the battery?
The battery is removable, which makes charging straightforward and convenient, especially if you need to recharge it away from home. Maintenance is generally low, as modern e-bike batteries are designed to be durable and require minimal upkeep. However, charging speed is average for this type of bike, so you may need to plan your rides around charging time, especially for longer trips.
Who is this bike best suited for?
This bike is best suited for trail riders looking for a reliable and reasonably priced mountain e-bike that handles rough terrain well. The 250W motor with 85Nm of torque provides smooth and controlled assistance, making it ideal for moderate off-road trails. Hydraulic disc brakes offer confident stopping power, and the removable battery adds convenience for charging and storage. While it may not be the best choice for steep climbs or high-speed trails, it's a solid option for casual to intermediate mountain bikers who prioritize value and trail comfort.
What are the main compromises or limitations of this bike?
The Merida eBIG NINE 400 has a 250W motor with 85Nm of torque, which provides adequate assistance for most trails but may feel less punchy when accelerating or climbing steeper inclines. While the bike's weight and battery efficiency are average for a mountain e-bike, the motor power is on the lower end of the spectrum, which could be a limitation for more demanding off-road conditions. However, the removable battery adds convenience for charging and storage, and the hydraulic disc brakes offer reliable stopping power on rough terrain.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2026
The bike was released this year
Screen
Shimano SC-EN500A
Lights Included
Yes
Weight (inc battery): 23.5 kg
The website average for electric bikes is
22.99 kg.
This electric bike is 0.50 kg over the average. Total bike weight may vary depending on frame size.
Sizing & Geometry
Min / Max Rider Height
S: 155–164 cm, M: 165–176 cm, L: 177–188 cm, XL: 189–200 cm
Merida Comp CC II (25 mm inner width, Tubeless Ready)
Wheelset Size
29 inch
Tires
Maxxis Ikon 29x2.2
Frame Info
Frame Material
Aluminium
Suspension Type
Front Suspension
Foldable Frame
No
Max Payload
150 kg (330.7 lbs)
Drivechain Details
Groupset details
Shimano CUES U6000 / LG300
Drivechain type
Chain drive
Shifters
Shimano CUES U 6000-10 R
Amount of gears
10 Gears
Rear Derailleur
Shimano CUES U 6000 (Link Glide)
Front Derailleur
None
Cassette
Shimano LG 300; 11-48 teeth; 10-speed
Cranks
Shimano FC-EM 600 (165 mm arms) with a 38 T Shimano chainring
Chain
Shimano LG 500 (Link Glide specific)
Bottom Bracket
Integrated into the Shimano EP 6 drive unit
Brakes
Brakes
Shimano MT-200
Brake Type: Hydraulic Disc Brake
Hydraulic operated discs brakes (Very good)
Brake Rotors
180 mm Shimano RT 10 rotors
Shifters
Shimano CUES U 6000-10 R
Other Components
Saddle
Unknown
Handlebars
Unknown
Bar Tape
Unknown
Manufactures Info
Worldwide Shipping:
Yes
Delivery across the globe!
Warranty:
2 Years
Limited warranty website average:
3.12 years
The power to do more of what matters. That's what the eBIG.NINE 400 offers. More fun when you're riding off-road, with a powerful new Shimano EP6 drive unit to help you up the hills. More time on the bike, with a 630 Wh battery that'll keep you going for miles. More control, thanks to a SR Suntour suspension fork, chunky tyres and powerful Shimano brakes. More of everything except unnecessary weight, thanks to a high-quality aluminium frame that' ... Read More
The power to do more of what matters. That's what the eBIG.NINE 400 offers. More fun when you're riding off-road, with a powerful new Shimano EP6 drive unit to help you up the hills. More time on the bike, with a 630 Wh battery that'll keep you going for miles. More control, thanks to a SR Suntour suspension fork, chunky tyres and powerful Shimano brakes. More of everything except unnecessary weight, thanks to a high-quality aluminium frame that's also got a lifetime warranty. Arguably the most versatile e-bike in our range, the tried and tested eBIG.NINE embodies the perfect balance of day-to-day usability and sporty leisure activity. It's a bike that can handle serious off-road riding but can also handle the commute to work with ease - especially if you want to have some fun on the way. The high-quality aluminium frame integrates a choice of 630 or 750 Wh battery sleekly into the downtube, with a more economical frame featuring semi-integrated 504 Wh battery on some models. All feature powerful and smooth Shimano drive units that will power you up any hill. Ready to be equipped with mudguards and even a side stand (or available as the EQ fully equipped version), the eBIG.NINE will help you make the most of any situation.
