Highlights based on this e-bike’s specs, comparisons and practical strengths.
88
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.
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.
84
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.
The larger battery capacity makes removable charging more useful for day-to-day convenience.
81
Good charging speed
Charging time is low compared with similar e-bikes.
Charging time is low compared with similar e-bikes.
The quoted charging time is long in absolute terms.
75
Good downhill control
Front suspension should help with basic control on uneven descents.
Front suspension should help with basic control on uneven descents.
Hydraulic disc brakes should provide controlled braking on descents.
The 29-inch or mullet wheel setup should help stability and control on descents.
The mountain bike design should be better suited to controlled descending.
70
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 brake specification appears to include larger rotors, which can help braking power and heat management.
The 29-inch wheel size should help rollover and stability on technical terrain.
Torque is low compared with similar e-bikes, which may limit technical climbing and control.
Torque-sensing assistance should help with smoother control on technical sections.
Multiple ride modes should help the rider manage assistance on technical trails.
70
Good battery capacity
Battery capacity is above average for this type of e-bike.
Battery capacity is above average for this type of e-bike.
The listed battery capacity is large in absolute terms.
69
Mixed 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 low compared with similar e-bikes, which may limit off-road climbing support.
The 29-inch wheel size should help rollover and stability on rougher terrain.
69
Decent everyday equipment
The included display or control unit adds useful ride information for daily use.
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.
Overview
The Giant Fathom E+ is a mountain bike designed for trail riding, offering smooth motor support that feels natural and controlled, especially on moderate terrain. Its hydraulic disc brakes provide confident stopping power, and the removable battery adds convenience for charging and storage. While it charges quickly and has a decent battery capacity for its class, the motor's power and torque are on the lower side, which may make steep climbs feel less effortless. The bike's weight also means it's not the easiest to lift, which could be a consideration for some riders.
Best For
✓
This mountain e-bike should suit trail riders who want a balance of comfort, control and reliable power for off-road adventures. Its above-average battery capacity and smooth power delivery make it a strong choice for longer rides on uneven terrain, while the hydraulic disc brakes and front suspension add confidence and comfort over rough trails. The removable battery also offers flexibility for charging on the go, which is especially useful for riders who travel to remote areas or need to manage battery life across multiple rides.
Who Should Avoid It
×
Riders tackling steep or technical trails may want to compare alternatives with stronger torque and more powerful motors. The motor power and torque are below average for mountain e-bikes, which could affect acceleration and hill-climbing performance. The power-to-weight ratio is also lower than similar models, which might impact agility and responsiveness on challenging terrain. However, the bike still offers smooth power delivery, confident braking, and a removable battery that could suit riders prioritising flexibility and control over raw power.
Ownership considerations
These points highlight practical ownership factors such as maintenance, storage, charging, everyday
handling and bad-weather usability.
37
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.
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 23.2 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.
84
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.
The larger battery capacity makes removable charging more useful for day-to-day convenience.
81
Good charging speed
Good
Charging time is low compared with similar e-bikes.
Charging time is low 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 80.
69
Decent everyday equipment
Mixed
The included display or control unit adds useful ride information for daily use.
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.
53
Mixed bad-weather practicality
Mixed
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 not listed, so bad-weather visibility may depend on extra accessories.
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.
40
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 130 kg.
Hydraulic disc brakes are useful when carrying children, shopping or heavier loads.
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 £2,999, the Giant Fathom E+ offers a favourable position against similar 2026 mountain e-bikes, with its strong component spec and performance justifying the cost.
Compared with similar mountain bike e-bikes on Bikkerr, this model sits £2,659.07 below average
Lowest price now: £2,699.00Best price ever seen:
£2,699.00Price drop detectedPrices update every ~24 hours
The Giant Fathom E+ is listed at £2,999, which sits comfortably against similar mountain e-bikes from 2026, offering a price that feels reasonable for the features included. It compares well with rivals in areas like battery capacity, which is strong for this type of e-bike, and the inclusion of hydraulic disc brakes, which improve control and stopping confidence on rough terrain. However, some similar e-bikes may offer stronger climbing support or feel more lively for their weight, which could be important for riders tackling steeper trails. For a mountain e-bike, the balance of a decent range, front suspension, and practical features like a removable battery makes the price easier to justify, especially for those prioritising comfort and reliability over maximum power. Riders looking for a well-rounded off-road e-bike that doesn’t push the limits of performance but delivers consistent support and ease of use are likely to see the value here.
We reach this value score by combining the bike’s price, specification, performance data and comparison against similar e-bikes in our database.
48
The listed price is GBP 2,999.
The bike appears to save around GBP 1,664 versus the average.
Battery capacity is strong compared with similar e-bikes.
Same power2 miles more rangeSame battery5 kg heavier2 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 below 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 10.78.
0
Not ideal for steep hills
Torque is below average for this type of e-bike.
Torque is below 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 10.78.
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 10.78.
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.
11
No built-in light advantage
Built-in lights are not listed, so separate lights may be needed.
Built-in lights are not listed, so separate lights may be needed.
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.
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 23.2 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.
27
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 average or better, which is useful for regular commuting.
Built-in lights are not listed, so commuting equipment may need adding.
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.
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 80.
E-system & battery comparison
Motor Power
250 watts
▼ 190 W below average
Motor Torque
70 Nm
▼ 8.5 Nm below average
Power-to-weight
10.78 W/kg
▼ 9.6 W/kg below average
Battery Capacity
750 Wh
▲ 119 Wh above average
Claimed Max Range
60 miles
▼ 0.5 miles below average
Charge Time
4h
▼ 75 mins faster than average
Sensor Type
Torque and Cadence Sensor
Removable Battery
Yes
Motor Name
Giant Sync Drive Pro 2
This mountain e-bike offers legal-style pedal assist with a focus on smooth, torque-sensing support that should feel natural and responsive on trails. Next to similar e-bikes, it may feel a bit less punchy in acceleration and less aggressive on steep climbs, where some alternatives might offer stronger low-speed push. The motor should help with climbing and technical riding, though riders may need to put in more effort on very steep sections. With torque and cadence sensing, the assistance should feel balanced and predictable, especially when adjusting ride modes. Riders looking for a well-rounded trail e-bike with predictable power delivery and a reasonable weight may find this motor setup suits 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 climbing steep trails?
The Giant Fathom E+ is a mountain bike with a 250W motor and 70Nm of torque, which should provide adequate support for moderate climbs but may struggle on very steep trails. While the motor delivers smooth and controlled assistance, its lower power and torque compared to similar e-bikes might make steep ascents feel less effortless. Hydraulic disc brakes offer confident stopping power, which is important for trail safety, but the overall performance on steep terrain will depend on your fitness and the trail conditions.
How does the motor perform on rough terrain?
The motor provides smooth and controlled assistance on rough terrain, making it feel natural for trail riding. However, with a 250W motor and 70Nm of torque, it may feel less powerful when navigating very steep or technical sections. The bike's hydraulic disc brakes offer confident stopping power, which is important for maintaining control on uneven trails.
Can I easily remove the battery for charging or storage?
Yes, the battery on the Giant Fathom E+ is removable, which makes it easy to charge or store separately from the bike. This feature is especially useful if you need to charge the battery at home or take it with you when traveling. The removable design also helps with maintenance and ensures you can keep your bike lightweight when the battery isn’t in use.
Is the battery capacity enough for long off-road rides?
The Giant Fathom E+ has a battery capacity of 750 watt-hours, which is above average for a mountain bike and should provide enough range for most off-road rides. However, the motor's lower power and torque may mean you'll need to manage your pace on long or steep trails to conserve battery. With proper planning and a conservative riding style, you should be able to complete most off-road adventures without needing to recharge mid-ride.
How comfortable is this bike on rough or uneven trails?
The Giant Fathom E+ should handle rough or uneven trails reasonably well, thanks to its hydraulic disc brakes and trail-focused design. However, the motor's lower power and torque may make it feel less responsive on very technical or steep sections. The bike's weight also means it's not the easiest to maneuver over rough terrain, but it should still be comfortable for most trail riding scenarios.
Is this bike good value for the price?
The Giant Fathom E+ is reasonably priced for a mountain e-bike, especially considering its reliable braking, removable battery, and decent range for most trail rides. However, the motor's lower power and torque may limit performance on steep climbs, and the bike's weight could make it less convenient to handle. While it offers solid features for trail riding, the price may feel higher if you're looking for stronger motor performance or more aggressive off-road capabilities.
How does the braking system handle fast descents?
The Giant Fathom E+ is equipped with hydraulic disc brakes, which provide confident and controlled stopping power even on fast descents. These brakes are well-suited for trail riding and should handle rough terrain effectively, though they are not overly aggressive. The braking performance is reliable in most conditions, making it a solid choice for mountain biking on descents.
What are the main limitations of this e-bike compared to others?
The main limitations of the Giant Fathom E+ compared to other mountain e-bikes are its lower motor power and torque, which may make steep climbs feel less effortless. While the bike offers smooth and controlled assistance on moderate terrain, it may struggle with more demanding trails. Additionally, its weight, while average for this type of e-bike, could make it harder to lift or carry, which might be a consideration for some riders.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2026
The bike was released this year
Screen
Giant RideControl Dash (full-color LCD display)
Lights Included
No
Weight (inc battery): 23.2 kg
The website average for electric bikes is
22.99 kg.
This electric bike is 0.20 kg over the average. Total bike weight may vary depending on frame size.
Sizing & Geometry
Min / Max Rider Height
S: 163–172 cm | M: 169–179 cm | L: 176–186 cm | XL: 183–193 cm
