HITWAY BK9S Electric Mountain Bike Fat Bike 26 Inch 250 W – Review and Comparison

The HITWAY BK9S is a premium electric mountain bike fat bike designed for demanding cyclists seeking a versatile bicycle capable of tackling both urban roads and mountain trails. With its high-torque motor, long-range Samsung battery and dual suspension, it represents one of the most comprehensive and powerful models in the HITWAY range.

Who is this bike for?

This model is particularly suited for:

• Daily urban and suburban commutes (15 to 50 km/day)
• Off-road outings on trails, gravel, forest paths and mountains
• Cyclists seeking a premium electric mountain bike fat bike
• Users needing to climb steep slopes (up to 25°)
• People between 165 and 195 cm tall
• Adventurers looking for long-distance rides (up to 150 km)

Performance and range

The HITWAY BK9S is equipped with a high-speed brushless hub motor of 250 W delivering impressive torque of 70 Nm, complying with European regulations. This high torque enables sharp acceleration and excellent hill-climbing ability, ideal for urban slopes, mountain trails and steep gradients.

• Claimed range: 70 to 150 km (depending on assistance mode)
• Real-world range: approximately 50 to 110 km depending on usage
• Maximum assisted speed: 25 km/h (EU standard)
• Hill-climbing capacity: up to 25°

In real-world conditions, range depends on:

• Rider weight
• Assistance mode chosen (3 levels)
• Terrain (flat vs uphill, road vs trail)
• Weather conditions and tyre pressure

The Samsung 48 V 15 Ah lithium-ion battery (720 Wh) is one of the BK9S's main strengths. Composed of premium Samsung cells, it offers excellent durability and superior range compared to most competing electric mountain bikes. Removable and firmly integrated into the frame, it features an anti-theft locking system for enhanced security. Full recharge takes 5 to 6 hours.

Design and comfort

The BK9S emphasises versatility and off-road comfort. Its sturdy aluminium alloy frame weighs 33.4 kg battery included, offering a good balance between strength and manoeuvrability. Integrated cabling and semi-integrated battery contribute to its refined aesthetics. The bike suits cyclists between 165 and 195 cm tall.

Its 26 × 4.0 inch pneumatic puncture-resistant knobby tyres offer excellent grip and stability on all terrains: asphalt, sand, snow, gravel or muddy paths. The dual suspension (front suspension fork + suspension saddle) effectively absorbs shocks on rough terrain, guaranteeing superior ride comfort even on the most challenging trails.

For braking, mechanical disc brakes front and rear provide powerful and consistent braking, reliable even in wet conditions or descending. The Shimano 7-speed transmission allows effective gradient management and adapts pedalling to your desired pace, with two riding modes (pedalling and pedal-assist) and three assistance levels.

The multifunction colour LCD display shows speed, distance, battery level and gear ratio in real time. It's compatible with an app function to personalise your riding experience. Integrated front lighting compliant with German STVZO standard, reliable rear light, wide adjustable rear mudguard, and TÜV and CE certifications complete the equipment for optimal safety.

Strengths

✔ High 70 Nm torque for excellent hill-climbing ability
✔ Samsung 720 Wh battery for extended range (70–150 km)
✔ Wide 26×4.0 puncture-resistant knobby tyres
✔ Dual suspension (front fork + suspension saddle)
✔ Shimano 7-speed transmission
✔ Colour LCD display with app function
✔ Aluminium alloy frame with integrated cabling
✔ Anti-theft battery locking system
✔ TÜV and CE certifications
✔ STVZO front lighting + adjustable rear mudguard

Weaknesses

❌ High weight (33.4 kg) limiting portability
❌ No folding format
❌ Mechanical brakes (less powerful than hydraulic)
❌ Cadence sensor (no torque sensor)
❌ High price for the fat bike segment

Comparison and positioning

The HITWAY BK9S positions itself as one of the most comprehensive and powerful electric mountain bike fat bikes from the brand, combining performance, record range and off-road comfort. Compared to the HITWAY BK15 4.0 (steel frame, 30.5 kg, 748.8 Wh), the BK9S offers similar range with a lighter aluminium alloy frame and premium Samsung battery. Compared to the HITWAY BK10S PRO (folding bike 720 Wh, hydraulic brakes), the BK9S prioritises a non-folding mountain bike format with 26-inch wheels more stable at high speed.

It's ideal for cyclists who want an electric mountain bike fat bike capable of handling both long urban journeys and off-road adventures and mountain trails, without compromise on range.

This bike is for you if:

✔ you're looking for a versatile electric mountain bike fat bike
✔ you need extended range (50 to 110 km real-world)
✔ you regularly ride on trails, gravel or mountains
✔ you want a sturdy aluminium alloy frame
✔ you tackle steep slopes daily
✔ you're between 165 and 195 cm tall
✔ you value TÜV and CE certifications

This bike is NOT for you if:

❌ you're looking for a folding bike for compact storage
❌ you want a lightweight, easily portable bike for daily use
❌ you want hydraulic brakes for premium braking
❌ you ride exclusively in town for short distances
❌ you prefer a torque sensor for proportional assistance
❌ you're seeking the best entry-level value for money