I’ve been riding the Bigniu BG-S for a few weeks now, putting it through city streets, rough patches, and even a bit of off-road fun. In this review, I’ll break down everything, the power, battery, comfort, durability, from the perspective of a real rider who actually tested it, not just read a spec sheet.
First Impressions & Setup
When the box finally arrived, I was impressed by how well packaged the BG-S was. It came about 80-85% pre-assembled, which meant I only had to attach the handlebars, front wheel, pedals, and check the brakes. The instructions were decent, though a few steps felt vague (especially wiring the display).
The look is bold and rugged: fat 20″ × 4.5″ tires, a slightly chunky frame, matte finish, and a display unit that feels solid. It gives off “adventure-ready commuter ebike” vibes.
Specs That Stand Out
Here’s what caught my eye before even riding:
- Peak power: 1,200 W motor (claimed), useful for hills & acceleration.
- Battery: 48 V, 15 Ah pack (removable), Bigniu’s site claims a decent range in pedal-assist mode.
- Tires: Fat 4.5″ – these give you grip on rough roads and stability on loose surfaces.
- Brakes & Gears: Dual disc brakes, plus 7-speed gearing for shifting when needed.
- Top speed & range: In their marketing, Bigniu claims ~35 mph on a flat (with throttle/electric mode) and up to 50 miles in pedal-assist mode.
These numbers had me excited. But as always, real-world riding tells a more nuanced story.
Riding Experience: What It’s Like on the Road
Power & Acceleration
Turning on the throttle, the BG-S delivers a punch. It takes off briskly, though not rocket-like, and handles hills better than many mid-tier ebikes I’ve tried. That said, the 1,200 W is “peak” power; sustained climbing or heavy loads bring in more draw on the battery.
In pedal-assist mode, I often used levels 3–4 (out of 5) for moderate hills; higher levels drained battery fast. On flat stretches, I managed speeds of 25–28 mph fairly comfortably with throttle assist.
Battery & Range
On a full charge, I did about 30–35 miles of riding (mixed city + some rough road) before the battery dropped significantly. I never quite hit 50 miles in real use. The 48 V, 15 Ah battery is solid, but heavy and bulky, removing it and carrying it is doable but feels like lifting a dense brick.
Charging fully took around 6–7 hours. I liked that the battery is removable for indoor charging, which is a must for many apartment dwellers.
Comfort & Handling
The fat tires are a blessing, they flatten bumps that would jar a standard commuter bike. Steering feels stable, and the frame absorbs vibrations well. However, on sharper turns and higher speeds, there’s some flex / wobble you notice, especially when the road is uneven.
Suspension is minimal (more of a comfort/softness than full shock absorption), so on rougher trails you’ll feel the bumps through the frame. The seat is average, I swapped it out after a few longer rides.
Brakes, Gears & Control
Braking is decent, dual disc brakes respond well, though under heavier load I felt some fade. The gear shifting is smooth if you shift gently; jerky upshifts at throttle can cause chain noise. The display is clear under sunlight, showing speed, battery level, and assist mode.
Pros & Cons (From My Own Use)
What I Loved
- Strong acceleration and hill performance for its class
- Fat tires give confidence on rough or uneven terrain
- Removable battery is a practical design
- Good blend of commuter and off-road potential
- The “look” and build quality feel premium
What Fell Short
- Parts (gel seat, replacement battery) are pricey and harder to source
- Real-world range is well below advertised max
- Hefty battery makes the bike heavy to carry
- Some frame flex at high speed / on rough ground
- Suspension is minimal, not ideal for aggressive off-road
Beast or Hype?
In short: the Bigniu BG-S is closer to a 1,200 W beast than marketing hype, but it’s not perfect. It delivers strong performance in many scenarios and is versatile enough for both daily commuting and light off-road fun. But it doesn’t flawlessly match every bold claim, range, comfort under stress, and component durability show their limitations.
If you want a midweight, adventurous electric bike that can handle hills, city roads, and weekend exploration, this one is worth a serious look. Just temper your expectations: it’s not going to rival full-throttle, high-end ebikes in every metric.
Conclusion
If you’re in the market, get one from a trusted seller, check import/shipping policies (especially in your country), and budget for spare parts (tires, brakes, possibly battery) down the line.
My score: 4/5 great value, strong performance, but not without its quirks.
Check out the Frownies Patch I reviewed earlier.