Highlights based on this e-bike’s specs, comparisons and practical strengths.
99
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 and rear suspension should improve control and comfort off-road.
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 27.5-inch wheel size is a strong option for off-road control and manoeuvrability.
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.
With stronger motor output, clear controls and ride modes become more useful.
90
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 and rear suspension should significantly improve control on technical trails.
Hydraulic disc brakes should provide the control needed for technical trail riding.
The 27.5-inch wheel size should help balance control and manoeuvrability.
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.
Power-to-weight is strong, which should help with technical sections that need quick support.
Multiple ride modes should help the rider manage assistance on technical trails.
87
Excellent 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 and rear suspension should improve control on uneven trails.
Hydraulic disc brakes should improve control on loose or uneven trails.
The 27.5-inch wheel size should balance manoeuvrability and trail control.
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.
Power-to-weight is strong, which should help when controlling the bike over uneven trail sections.
86
Excellent downhill control
Front and rear suspension should improve control and confidence on descents.
Front and rear suspension should improve control and confidence on descents.
Hydraulic disc brakes should provide controlled braking on descents.
The mountain bike design should be better suited to controlled descending.
86
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.
83
Good rough-road comfort
Front and rear suspension should significantly improve comfort on rough roads and uneven surfaces.
Front and rear suspension should significantly improve comfort on rough roads and uneven surfaces.
The larger wheel size should help roll over bumps and rough surfaces more smoothly.
The mountain bike format is generally better suited to rougher terrain.
Hydraulic disc brakes add useful control on rougher routes.
The bike weight may help it feel more planted over rough surfaces.
Frame material is listed as aluminium, which gives useful comfort and build context.
82
Good hill climbing support
Torque is above average for this type of e-bike.
Torque is above average for this type of e-bike.
Power-to-weight is above average.
Motor power is high 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 24.37.
76
Good braking confidence
Hydraulic disc brakes should provide strong and controlled stopping power.
74
Good power-to-weight ratio
Power-to-weight is above average for this type of e-bike.
Power-to-weight is above average for this type of e-bike.
Motor power is high for this type of e-bike.
The bike is heavier than average for its type.
The calculated power-to-weight score is 24.37.
Overview
The Polygon SISKIU HE (BOSCH) 2025 is a mountain bike built for off-road adventures, offering strong motor support and responsive trail control. With a powerful 600W motor and 85Nm of torque, it handles hills and rough terrain confidently, while front and rear suspension ensures a comfortable ride over uneven surfaces. The removable battery adds convenience for charging and storage, though the bike's weight makes it slightly harder to lift, and its range of 40km may require more frequent recharging for longer rides. Hydraulic disc brakes provide reliable stopping power, making it a solid choice for trail-focused riders who prioritize performance over extended range.
Best For
✓
This mountain e-bike should suit riders who prioritize off-road performance, trail control and comfort on rough terrain. Its strong torque and hill-climbing support, combined with front and rear suspension, make it a solid choice for trail riders looking for confidence and control on uneven surfaces. The removable battery adds flexibility for charging away from the bike, which is especially useful for riders who travel to remote areas. Riders who value responsive assistance that matches their effort and need a reliable e-bike for varied trail conditions will likely appreciate its design and capabilities.
Who Should Avoid It
×
Riders planning long off-road adventures may want to compare alternatives, as the range is below average for similar mountain e-bikes, which could limit extended trail rides. The battery capacity is also average for this category, which might not fully satisfy those needing more power for demanding terrain. However, the bike still offers strong trail control and excellent off-road capability, making it a solid choice for riders prioritizing performance on technical trails over extended range.
Ownership considerations
These points highlight practical ownership factors such as maintenance, storage, charging, everyday
handling and bad-weather usability.
30
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.
Front and rear suspension can add maintenance 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.
A full-suspension mountain bike format is usually bulkier and harder to store indoors.
21
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 24.62 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.
86
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.
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 64.
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.
42
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.
A removable battery makes charging easier around family or utility use.
Same power15 miles less range25 Wh less battery0 kg lighter1 fewer gears
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Potential limitations
Areas where this e-bike may be less strong based on its specs and comparisons.
0
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 low compared with similar e-bikes, which may limit commuting flexibility.
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 strong compared with similar e-bikes, which helps with bags, shopping or extra kit.
The bike is heavier than average for its type, which may make daily handling less convenient.
Front and rear suspension can add weight and complexity for normal commuting.
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.
A full-suspension mountain bike format is usually bulkier and harder to store indoors.
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.
20
Poor range-to-weight balance
The bike is heavier than average, which limits range-to-weight balance.
The bike is heavier than average, which limits range-to-weight balance.
Battery efficiency appears broadly average.
The calculated range per kg is 1.62.
The calculated range per battery unit is 64.
21
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 24.62 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.
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.
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 64.
30
Some maintenance considerations
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.
Front and rear suspension can add maintenance complexity.
E-system & battery comparison
Motor Power
600 watts
▲ 160 W above average
Motor Torque
85 Nm
▲ 6.5 Nm above average
Power-to-weight
24.37 W/kg
▲ 4.0 W/kg above average
Battery Capacity
625 Wh
▼ 5.9 Wh below average
Claimed Max Range
40 miles
▼ 21 miles below average
Charge Time
5h
▼ 15 mins faster than average
Sensor Type
Torque and Cadence Sensor
Removable Battery
Yes
Motor Name
Bosch Performance Line CX
This mountain e-bike features a strong motor output that should feel lively and capable on trails, with good support for climbing and low-speed technical riding. Next to similar e-bikes, the motor’s power and torque should offer a responsive and natural feel, especially when paired with torque and cadence sensing for smoother assistance. The motor should provide solid climbing support and help maintain momentum on rough terrain, though the higher power may mean a slightly more aggressive acceleration feel compared to some models. The sensor setup should allow for predictable and controllable assistance, making it easier to manage technical sections or adjust effort as needed. Riders looking for a motor that balances power with trail control and responsiveness may find this 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?
This bike is well-suited for off-road trails, with a powerful motor and suspension that handle rough terrain effectively. However, its range of 40 miles may require more frequent recharging on longer rides, and the bike's weight could make it slightly harder to lift or carry when needed.
How does the motor perform on steep climbs?
The motor should handle steep climbs effectively, thanks to its 600W power and 85Nm of torque, which are above average for similar mountain e-bikes. The torque and cadence sensor ensures responsive assistance when climbing, making it easier to tackle inclines without excessive effort. However, the battery efficiency is average, so you may need to plan for more frequent charging on long climbs or rough terrain.
Is the bike comfortable for rough trails and uneven surfaces?
Yes, the bike should be comfortable for rough trails and uneven surfaces. The front and rear suspension is designed to absorb shocks and improve stability on rough terrain, making it well-suited for trail riding. Hydraulic disc brakes like the SRAM Code R also provide confident stopping power, which is important when navigating uneven or technical trails.
Does the battery provide enough range for regular off-road use?
The battery provides a range of 40 miles, which is below average for similar mountain e-bikes. This may be limiting for extended off-road rides, especially on challenging terrain. However, the removable battery offers flexibility for charging during multi-day trips or when access to power is limited.
How easy is it to handle and lift the bike due to its weight?
The bike weighs 24.62 kg, which is heavier than average for a mountain e-bike, so it may feel somewhat challenging to lift, especially if you need to carry it frequently. However, the weight is typical for this category, and the removable battery adds some flexibility for charging and storage. While it's not the lightest option, the weight should be manageable for most users on trails or when transporting the bike.
What are the main compromises of this bike compared to similar models?
Compared to similar mountain e-bikes, this model has a slightly lower range, which may require more frequent charging on longer rides. While the motor power and torque are strong for climbing and trail control, the bike's weight makes it a bit harder to lift, and the frame doesn't fold, limiting storage options. Charging time is average, so you shouldn't expect unusually fast battery recharge.
Is this bike good value for the price compared to other mountain e-bikes?
This bike offers good value for the price compared to other mountain e-bikes, especially considering its strong motor power and torque, which are above average for this type of e-bike. The price looks favourable against similar models, and the removable battery adds practicality for charging and storage. However, the range is slightly below average, which may be a consideration for longer off-road rides.
How practical is the removable battery for charging and storage?
The removable battery is a practical feature that makes charging and storage more convenient, especially if you need to charge it separately from the bike or store it in a different location. This flexibility can be useful for trail riders who may need to recharge the battery at a base camp or home. However, the battery capacity and charging time are average for similar mountain e-bikes, so you may need to plan charging stops more carefully on longer rides.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2025
The bike was released 1 years ago
Screen
Bosch display/remote
Lights Included
No
Weight (inc battery): 24.62 kg
The website average for electric bikes is
22.99 kg.
This electric bike is 1.62 kg over the average. Total bike weight may vary depending on frame size.
Sizing & Geometry
Min / Max Rider Height
SM: 153–165 cm, MD: 163–175 cm, LG: 173–185 cm, XL: 183–195 cm
