Torque and cadence sensing adds value by improving assist control and ride feel.
A removable battery adds practical value for charging and storage.
The included display or control unit adds useful everyday value.
Front and rear suspension adds component value, especially for comfort or off-road use.
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.
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.
Multiple ride modes should help the rider manage assistance on technical trails.
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 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.
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 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.
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 7.33.
The calculated range per battery unit is 282.54.
Overview
The Polygon SISKIU HE (SHIMANO Di2) 2025 is a mountain bike designed for off-road adventures, offering a smooth and controlled ride with its 250W motor and 85Nm torque. Its front and rear suspension provide good comfort on rough terrain, while the efficient battery delivers a useful range of 178km on a single charge. The removable battery adds convenience for charging and storage, and the bike feels reasonably priced for its capabilities. However, its motor power and weight may limit performance on steep hills, and the charging time is notably slower than average for this type of e-bike.
Best For
✓
This mountain e-bike should suit riders who prioritize off-road performance and comfort on rough terrain. Its strong motor power, suspension system, and smooth power delivery make it a solid choice for trail riding and longer adventures. The removable battery and good range also make it appealing for riders who want flexibility and endurance on varied trails. Riders who value confident braking and natural assistance response will likely find this bike well-suited to their needs.
Who Should Avoid It
×
Riders seeking the most aggressive motor punch or faster charging times may want to compare alternatives. The motor power and power-to-weight ratio are below average for similar mountain e-bikes, which could affect performance on steep or technical trails. Charging speed is also slower than average for this type of bike, which may be a drawback for riders who need quick turnaround times. However, the bike still offers strong off-road capability, smooth power delivery and good value for money, making it a solid choice for many mountain e-bike riders.
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 24.3 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.
83
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 longer charging time makes it more useful to charge the battery separately from the bike.
0
Very slow charging speed
Poor
Charging time is longer than average for this type of e-bike.
Charging time is longer than 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 282.54.
Range is strong despite only average or smaller battery capacity, which supports the efficiency result.
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.
48
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.
Range is average or better compared with similar e-bikes, which supports practical daily use.
350W more power103 miles less range4 Ah less battery2 kg lighter2 fewer 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 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 10.29.
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 average or better compared with similar e-bikes, which supports commuting practicality.
Charging time is longer than average, which may be less convenient for daily use.
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.
Front and rear suspension can add weight and complexity for normal commuting.
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 10.29.
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.
0
Very slow charging speed
Charging time is longer than average for this type of e-bike.
Charging time is longer than average for this type of e-bike.
The quoted charging time is long in absolute terms.
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 10.29.
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.
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
250 watts
▼ 190 W below average
Motor Torque
85 Nm
▲ 6.5 Nm above average
Power-to-weight
10.29 W/kg
▼ 10 W/kg below average
Battery Capacity
630 Wh
▼ 0.9 Wh below average
Claimed Max Range
178 miles
▲ 117 miles above average
Charge Time
6h
▲ 45 mins slower than average
Sensor Type
Torque and Cadence Sensor
Removable Battery
Yes
Motor Name
Shimano STEPS DU-EP 600
This mountain e-bike offers legal-style pedal assist with strong torque support that should feel capable on trails and climbs. Next to similar e-bikes, its assistance should feel balanced and predictable, with torque and cadence sensing helping to deliver a natural response. The motor should provide solid support on rough terrain and low-speed sections, though some similar models may offer more immediate acceleration or a livelier feel for their weight. The assistance should be smooth and controllable, with ride modes likely offering adjustability for different trail conditions. Riders looking for reliable, efficient support on trails and longer rides 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 front and rear suspension that improves comfort on rough terrain. The 85Nm torque provides solid assistance for climbing trails, and the 178-mile range should cover most day-long adventures. However, the 250W motor may feel less powerful on very steep sections, and the charging time is slower than average, which could be a consideration for frequent riders.
How does the motor perform when climbing steep trails?
The motor provides smooth and controlled assistance when climbing steep trails, thanks to the torque and cadence sensor. However, the motor power is below average for similar e-bikes, which may make climbing very steep trails feel less responsive. The torque is above average, which helps with hill climbing, but the overall power-to-weight ratio is low, which could impact performance on the steepest inclines.
Does the bike offer good comfort on rough terrain?
Yes, the bike should offer good comfort on rough terrain, thanks to its front and rear suspension system, which is designed to absorb shocks and improve stability over uneven surfaces. The 27.5-inch wheels and wide tires also contribute to a smoother ride on trails and rough roads. However, as a mountain e-bike, it's optimized for off-road use rather than urban commuting, so its comfort on rough terrain is a key strength.
Is the battery efficient enough for regular mountain biking use?
The battery efficiency is above average for similar mountain e-bikes, which means you can expect a good range for regular off-road use. With a range of 178 miles, it should handle most trail rides comfortably, especially with the removable battery making charging more convenient. However, the charging time is longer than average, so you may need to plan for longer charging sessions if you ride frequently.
How practical is this bike for day-to-day off-road ownership?
This bike is well-suited for day-to-day off-road ownership, thanks to its mountain bike design, front and rear suspension, and hydraulic disc brakes, which provide confident stopping power on rough terrain. The 178-mile range should cover most off-road trips, and the 6-hour charge time makes it practical for regular use. However, its mountain bike format is less focused on commuting, so it may not be as efficient for daily urban travel.
What are the main compromises of this bike compared to others?
This bike offers strong off-road capability and good value, but it has a lower motor power and power-to-weight ratio compared to similar e-bikes, which may affect acceleration and performance on steep trails. The charging time is also longer than average, so you may need to plan for more frequent charging if you ride regularly. These factors are typical tradeoffs for a mountain e-bike focused on value and off-road use.
Is this bike good value compared with similar e-bikes?
This bike offers strong value for money compared with similar mountain e-bikes, especially considering its above-average range and efficient battery use. While the motor power and power-to-weight ratio are below average, the overall package is competitively priced and well-suited for off-road riding. The hydraulic disc brakes and chain drive add to its practicality, though the chain may require more maintenance than other drive types.
How does the braking system perform on rough trails?
The Shimano hydraulic disc brakes on this mountain e-bike provide confident stopping power on rough trails, even when wet or muddy. With front and rear suspension, the bike absorbs impacts well, which helps maintain control and reduces brake fade. Hydraulic brakes are generally more responsive than mechanical ones, making them a solid choice for off-road riding conditions.
eBike Overview
eBike Type: Mountain Bike
The style of riding intended for this bike
Released:
2025
The bike was released 1 years ago
Screen
Shimano STEPS SC‑EN600 1.4” LCD Screen
Lights Included
No
Weight (inc battery): 24.3 kg
The website average for electric bikes is
23.93 kg.
This electric bike is 0.36 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
Alloy Double Wall 32-Hole Tubeless Ready rims built onto Shimano TC 500 center-lock Boost hubs (15 x 110 mm front / 12 x 148 mm rear)
