Technology and technical features
Motor: 48 V, 1000 W brushless rear motor – in official specifications it reaches a limited speed of 50 km/h, but with an additional motor (e.g. dual motor version) it can reach 55 km/h or more.
Battery: Li-ion 48 V with a capacity of 17.5 Ah or 20 Ah (approximately 840–960 Wh). It provides a range of between 55–80 km (35–50 miles), depending on the riding mode – sport mode or pedaling.
Download: Shimano 7-speed transmission and 5-speed PAS (pedal assist) with LCD display for speed, battery level, riding mode and errors.
Suspension: Front fork and rear suspension – by smoothing out bumps, they ensure a comfortable ride even on gravel roads.
Brakes and safety: Disc brakes front and rear, LED light front, rear brake light, turn signals in some models. The design is IP34/IP54 rain protection.
Wheels and frame: 20″ × 4.0″ “fat tire” – suitable for sand, snow and uneven surfaces. Choice of steel or aluminum frame. Load capacity up to 150 kg.
Weight: Approximately 32–42 kg (depending on the version), which is standard for the fatbike category.
Charging: 4–8 hours, includes USB port for charging phones while driving.
A nerd's experience in the field
Start – the engine is responsive with good acceleration, you can feel the torque despite the urban-balanced design. Speeds of 30–35 km/h are easily achievable, with higher speeds in “off-road” mode.
Reach – the 20 Ah battery will impress you: 60–70 km with PAS and a moderate pace, almost 55 km purely electric. Higher PAS saves battery and extends range.
Comfort – fat wheels + suspension withstand all the bumps in the road – gravel, sand, bumps – the ride remains smooth.
Braking & Safety – the disc brake system with 180 mm discs stops effectively, LED lighting provides safety even in the dark.
Weight – 32 kg weight is not ideal for carrying or combining with public transport. Charging is slow, this should be taken into account when planning your trips.
Evaluation by criteria
| Criterion | Rating (★‑5) | Nerd comment |
|---|---|---|
| Engine and power | ★★★★☆ | Strong acceleration, maintains speed even on steep slopes. |
| Range and battery | ★★★★☆ | Solid, shorter charging time would be a plus. |
| Driving comfort | ★★★★★ | Fat tires + suspension = vibration-free ride. |
| Security | ★★★★☆ | The brakes and lights are great. |
| Portability | ★★★☆☆ | Difficult to carry. |
| Technology & usability | ★★★★☆ | LCD and USB are useful, but a bike app would be the icing on the cake. |
| Price / value | ★★★★☆ | Price – affordable considering the equipment and capacity. |
Overall rating: 4.2 / 5 ⭐
Who do I recommend the C91 to?
Great for:
Adventurers looking for a model for snow, gravel and urban trails.
For heavier cyclists who want a comfortable yet robust e-bike.
Those who want range and like a more powerful drive.
Not best for:
Users on public transport or a user who will be transported frequently.
Those looking for GPS navigation or a mobile app - there isn't one.
Speed enthusiasts who want +60 km/h speeds – the standard model is limited to 50–55 km/h.
Conclusion
C91 electric bike It's the perfect mix of adrenaline and comfort. As a nerd, I see it as a "fat bike with a motocross soul" - capable, comfortable, and ready for the terrain, and it just pulls you off-road.
Buy this bike from Nerd: C91
To all Electric bikes at the Nerd shop.
