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 120.
Range is strong despite only average or smaller battery capacity, which supports the efficiency result.
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.
93
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.
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.
92
Excellent 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 calculated power-to-weight score is 24.49.
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.
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 average for this type of e-bike.
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.
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.
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 3.06.
The calculated range per battery unit is 120.
Overview
The Polygon SISKIU HE (BOSCH) 2024 is a mountain bike built for trail riding and rough terrain, offering strong motor support with 600W power and 85Nm of torque to help you tackle hills and uneven ground with confidence. Its front and rear suspension, combined with hydraulic disc brakes, provide a comfortable and controlled ride on rough roads and trails. The bike makes good use of its 625Wh battery, delivering a useful range of 75km for longer rides, and the removable battery adds convenience for charging and storage. However, the average charging time of 5 hours and the bike's weight may affect convenience for frequent riders or those needing to carry it easily.
Best For
✓
This mountain e-bike should suit riders who prioritize off-road performance, trail control and hill climbing support. Its strong motor power and torque, combined with front and rear suspension, make it well-suited for rough terrain and longer rides. Riders who value confident braking and a responsive power delivery will also appreciate its features. It may be a good choice for those looking for a capable all-round mountain e-bike with a balance of comfort and performance.
Who Should Avoid It
×
Riders carrying heavier loads may want to compare utility-focused alternatives, as the bike's max payload is 120 kg, which is below average for mountain e-bikes designed for more demanding trail use or carrying gear. Riders who prioritize faster charging or more battery capacity for extended off-road trips could find stronger options in similar mountain e-bikes with quicker charge times and larger battery sizes. However, the bike still suits riders who value strong hill climbing, responsive trail control, and good off-road capability for typical mountain biking use cases.
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 removable battery can make storage and indoor charging more flexible.
A full-suspension mountain bike format is usually bulkier and harder to store indoors.
30
Some lifting limitations
Weak
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 24.5 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.
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 120.
Range is strong despite only average or smaller battery capacity, which supports the efficiency result.
62
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.
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.
25
Limited family utility practicality
Poor
The listed maximum payload is practical for lighter utility use.
The listed maximum payload is practical for lighter utility use.
The listed maximum payload is 120 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.
100W more power23 miles less range3 Ah less battery1 kg lighterSame gears
Potential limitations
Areas where this e-bike may be less strong based on its specs and comparisons.
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 removable battery can make storage and indoor charging more flexible.
A full-suspension mountain bike format is usually bulkier and harder to store indoors.
4
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.
Front and rear suspension can add weight and complexity for normal commuting.
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.
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.
25
Limited family utility practicality
The listed maximum payload is practical for lighter utility use.
The listed maximum payload is practical for lighter utility use.
The listed maximum payload is 120 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.
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.
30
Some lifting limitations
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 24.5 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.
35
Limited battery capacity
Battery capacity is average for this type of e-bike.
Battery capacity is average for this type of e-bike.
The listed battery capacity should be practical for regular riding.
E-system & battery comparison
Motor Power
600 watts
▲ 160 W above average
Motor Torque
85 Nm
▲ 6.5 Nm above average
Power-to-weight
24.49 W/kg
▲ 4.1 W/kg above average
Battery Capacity
625 Wh
▼ 5.9 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
Bosch Performance Line CX (Gen 4)
This mountain e-bike offers a strong and responsive motor setup that should feel capable and confident on trails, with good support for climbing and low-speed control. The motor output and torque should compare well against similar e-bikes, providing a balance of power and efficiency that suits off-road riding. The torque and cadence sensor should help maintain smooth and predictable assistance, especially when navigating rough terrain or technical sections. The power-to-weight balance should make the motor feel lively and responsive, even with the bike's overall weight. Riders looking for a mountain e-bike that delivers strong assistance without sacrificing efficiency or trail control should 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?
This mountain bike is well-suited for long off-road rides, thanks to its strong motor support, 600W power, and 85Nm of torque, which help you tackle hills and uneven terrain with confidence. The front and rear suspension, combined with hydraulic disc brakes, provide a comfortable and controlled ride on rough trails, while the 75-mile range should keep you going for extended rides. However, the average charging time and the bike's weight may affect convenience for frequent or heavy use.
How does the motor perform when climbing steep trails?
The motor should provide strong support when climbing steep trails, thanks to its 85 Nm of torque, which is above average for similar e-bikes. This level of torque, combined with the 600-watt motor power, should help you tackle steep inclines with confidence. The torque and cadence sensor also ensures the motor responds well to your pedaling effort, making climbs feel more manageable.
Does the bike handle rough terrain comfortably?
This mountain e-bike is well-suited for rough terrain, thanks to its front and rear suspension, which should significantly improve comfort on uneven surfaces. The hydraulic disc brakes, specifically the SRAM Code R, offer confident stopping power, which is essential for trail riding. With a range of 75 miles, it should handle long off-road rides comfortably, though it's less focused on daily urban commuting.
Is the battery efficient enough for extended trail use?
The battery should provide enough range for extended trail use, as the range of 75 miles is above average for similar mountain e-bikes. This suggests the bike is efficient at converting battery power into distance, which is helpful for longer rides. However, the battery capacity is average for this type of e-bike, so if you frequently ride long distances, you may need to plan for additional charging stops or carry a spare battery.
How practical is this bike for everyday off-road riding?
This bike is well-suited for everyday off-road riding, thanks to its mountain bike design, front and rear suspension, and hydraulic disc brakes, which provide confident stopping power on rough terrain. The 75-mile range should cover most trail rides, and the 27.5-inch wheels with wide tires are ideal for uneven surfaces. While it's not optimized for daily commuting, it excels in trail and off-road conditions.
What are the main compromises of this bike compared to others?
This bike is well-suited for off-road trails and climbing, but there are a few tradeoffs to consider. The frame doesn't fold, so storage will depend on its size and weight, which are average for a mountain e-bike. While the charging time is in line with similar models, it's not especially fast, which may be a consideration for frequent riders. The bike's weight is also average, which means it may be a bit heavy to lift or carry when needed.
Is this bike good value for its price?
This bike offers good value for its price, especially considering its strong performance on trails and its above-average range for a mountain e-bike. The motor power and torque are also above average, which should help with climbing and handling rough terrain. While the battery capacity is average for this type of e-bike, the efficiency is above average, meaning you can expect a decent range for the size of the battery.
How easy is it to charge and maintain the battery?
The battery is removable, which makes charging convenient, especially if you need to recharge it away from home. With a 625Wh battery capacity, it should provide enough power for most trail rides, though it's average for mountain e-bikes. It takes about 5 hours to fully charge, which is typical for this type of bike, so you'll need to plan charging stops if you're riding long distances on rough terrain.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2024
The bike was released 2 years ago
Screen
Bosch eBike System with Bosch Performance Line CX (display not specified)
Lights Included
No
Weight (inc battery): 24.5 kg
The website average for electric bikes is
22.87 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: 157–168 cm, MD: 168–178 cm, LG: 178–185 cm, XL: 185–193 cm
Folded Dimensions
Unknown
Wheel & Tire Details
Wheelset Name
Polygon MT 9 Tubeless-Ready rims built with an alloy double-wall profile (36 mm inner width)
