Highlights based on this e-bike’s specs, comparisons and practical strengths.
100
Excellent battery efficiency
The bike appears to get strong range from its battery size.
The bike appears to get strong range from its battery size.
The calculated range per battery unit is 150.
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.
83
Good range-to-weight balance
Range is high compared with similar e-bikes.
Range is high compared with similar e-bikes.
The bike weight is average for this type of e-bike.
Battery efficiency appears strong, which supports a better range-to-weight balance.
Range is strong without needing an unusually large battery, which supports efficiency.
The calculated range per kg is 3.19.
The calculated range per battery unit is 150.
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.
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 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 low compared with similar e-bikes.
Battery efficiency appears strong, which should help stretch range on longer rides.
The removable battery can make charging easier during longer days or multi-stop rides.
Charging time is average for this type of e-bike.
The display or control unit should make it easier to monitor assistance and battery use on longer rides.
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.
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.
Overview
The Giant Fathom E+ 3 is a mountain bike designed for trail riding, offering smooth and controlled motor support that feels natural on varied terrain. Its efficient battery use provides a decent range for longer rides, and the removable battery adds convenience for charging and storage. Hydraulic disc brakes offer confident stopping power, though the bike's lower motor power and torque may feel less punchy when accelerating or climbing steep hills. Weighing 23.5kg, it's average for its category, which might make it slightly heavier to handle when lifting, but it remains a solid choice for riders prioritizing range and trail performance over raw power.
Best For
✓
This mountain e-bike should suit trail riders who want a balance of performance and practicality for off-road adventures. Its smooth power delivery and responsive braking make it a confident choice for varied terrain, while the removable battery and decent range support longer rides without frequent recharging. Riders who value a natural riding feel and reliable stopping power on uneven trails will likely appreciate its design and capabilities.
Who Should Avoid It
×
Riders seeking stronger motor punch or more battery capacity may want to compare similar mountain e-bikes. The motor power and torque are below average for this type of bike, which could affect performance on steep trails or long rides. Charging speed is also slower than some competitors, which might be a drawback for riders who need quick battery top-ups. However, the bike still offers smooth power delivery and confident braking, which may suit riders prioritising control and ride quality over raw power and range.
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 23.5 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.
100
Excellent battery efficiency
Excellent
The bike appears to get strong range from its battery size.
The bike appears to get strong range from its battery size.
The calculated range per battery unit is 150.
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.
34
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.
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+ 3 looks favourably positioned against similar 2024 mountain e-bikes, offering a competitive entry point for its category. Its value is supported by a well-rounded feature set, though potential trade-offs in component spec may be worth considering.
Compared with similar mountain bike e-bikes on Bikkerr, this model sits £2,304.41 below average
The Giant Fathom E+ 3 is listed at £2,999, which sits comfortably against similar mountain e-bikes from 2024, offering a price that feels reasonable for the features included. It compares well with rivals in terms of range, with 75 miles on a single charge, and the efficient use of its 500Wh battery, along with hydraulic disc brakes and torque-sensing assistance, which should make for a more natural and confident riding experience on rougher trails. However, some similar e-bikes may offer a larger battery or stronger climbing support, and a few alternatives might feel more lively for their weight. For a mountain e-bike focused on trail comfort and control, the Fathom E+ 3 strikes a balanced package that should appeal to riders prioritising reliability and manageable weight over maximum range or aggressive performance. Buyers looking for a dependable, well-rounded mountain e-bike that doesn’t push the limits of power or battery size may find the value case particularly clear 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.
350W more power20 miles less range3 Ah less battery2 kg lighter2 more 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 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 10.64.
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 10.64.
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
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.
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.
12
Low battery capacity
Battery capacity is low compared with similar e-bikes.
Battery capacity is low compared with similar e-bikes.
The listed battery capacity should be practical for regular riding.
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.
E-system & battery comparison
Motor Power
250 watts
▼ 190 W below average
Motor Torque
70 Nm
▼ 8.5 Nm below average
Power-to-weight
10.64 W/kg
▼ 9.7 W/kg below average
Battery Capacity
500 Wh
▼ 131 Wh below average
Claimed Max Range
75 miles
▲ 14 miles above average
Charge Time
5h
▼ 15 mins faster than average
Sensor Type
Torque and Cadence Sensor
Removable Battery
Yes
Motor Name
Giant Sync Drive Sport
This mountain e-bike offers a legal-style pedal assist with strong torque support for its category, providing a balanced and predictable riding experience on trails. Next to similar models, its motor feels more modest in outright punch and liveliness, which may be expected given its lighter design and focus on efficiency. Climbing steeper trails may require more rider effort, as the torque is more modest than many trail e-bikes, and acceleration might feel less aggressive under heavy load. The torque and cadence sensor should help maintain smooth and responsive assistance, especially on technical terrain, though ride modes are not specified to adjust the feel. Riders looking for a trail-focused e-bike that prioritizes range and efficiency over maximum power 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 Giant Fathom E+ 3 is well-suited for long off-road rides, thanks to its high range of 75 miles, which should cover most trail adventures. The hydraulic disc brakes provide confident stopping power on rough terrain, and the removable battery adds convenience for charging. However, the bike's lower motor power and torque may make steep climbs feel a bit slower, so riders should expect a more gradual pace on challenging trails.
How does the motor perform when climbing steep trails?
The motor provides smooth and controlled assistance, but it may feel less punchy when climbing steep trails due to its lower power and torque. While it can handle moderate inclines with ease, steeper climbs might require more effort, especially if you're carrying extra weight or riding at higher speeds. The bike's efficient battery use helps extend the range, which is a plus for longer rides, but the motor's performance on very steep terrain is more modest compared to bikes with higher power and torque ratings.
Does the bike handle rough terrain comfortably?
The Giant Fathom E+ 3 is built for trail riding and should handle rough terrain comfortably, thanks to its hydraulic disc brakes and suspension design. While the motor power and torque are on the lower side for its category, the smooth power delivery and efficient battery use help maintain control on varied trails. Riders looking for a reliable, comfortable ride on trails will find this bike suitable, though it may not be the best choice for very steep or technical climbs.
Is the battery efficient enough for regular trail use?
The battery should be efficient enough for regular trail use, offering a high range of 75 miles on a single charge, which is strong for a mountain bike with this battery size. While the battery capacity is lower than some competitors, the efficiency is high, meaning you'll get good mileage from each charge. The removable battery also makes it convenient to charge, especially if you're riding multiple trails in a day.
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. While the battery capacity is on the lower side for mountain bikes, its efficiency is strong, meaning you can expect a decent range for most trail rides. Maintenance is simple, as there are no complex components to worry about, and the battery should last for many years with regular use.
Who is this bike best suited for?
The Giant Fathom E+ 3 is best suited for riders who prioritize range and trail performance over raw power. It offers smooth and controlled motor support that feels natural on varied terrain, making it a solid choice for longer rides on trails. However, its lower motor power and torque may feel less punchy when accelerating or climbing steep hills, so it's more suited for moderate trails rather than technical or steep terrain.
Is this bike good value for the price?
The Giant Fathom E+ 3 offers a solid balance of efficiency, range, and trail performance for its price. While it may not have the strongest motor power or torque compared to similar e-bikes, its high range and efficient battery use make it a good option for riders who prioritize endurance on varied terrain. The removable battery adds convenience, and the hydraulic disc brakes provide reliable stopping power, making it a practical choice for trail riding within its category.
What are the main compromises of this bike compared to similar models?
Compared to similar mountain bikes, the Giant Fathom E+ 3 has a lower motor power and torque, which may make acceleration and steep hill climbing feel less responsive. It also has a smaller battery capacity, which could limit range on longer rides compared to some competitors. However, its efficient battery use and removable design offer practical benefits for charging and storage. The bike's average weight is manageable for most trail use, but it may feel heavier to lift than some lighter models in the same category.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2024
The bike was released 2 years ago
Screen
Giant RideControl Dash (full-color LCD display)
Lights Included
No
Weight (inc battery): 23.5 kg
The website average for electric bikes is
23.82 kg.
This electric bike is 0.33 kg under 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
