We read Kingbull's listing for the Discover ST 2.0 on 9 October 2026 and checked it against U.S. e-bike law and basic battery arithmetic. We have not ridden this bike.
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Research-based score out of 10. The overall score is the average of the four parts below.
- 750 W motor fits the U.S. class limit
- UL 2849 and UL 2271 certification claimed
- Torque sensor, rare at this price
- Hydraulic brakes with 180 mm rotors
- 60-mile range needs ideal conditions
- 77 lb
- Only 15 days to return
- Title says "Peak 1300W", specs give no peak figure
The short answer
Consider it if
- You want a fat-tire bike you can legally ride where Class 2 e-bikes are allowed.
- You want pedal assist that responds to how hard you push.
- You live in a city or building that requires UL-certified e-bikes.
Skip it if
- You need to carry the bike upstairs. It weighs 77 lb.
- You are under 5 ft 5 in. That is the stated minimum rider height.
- You want a long return window to decide.
Where it sits in the class system
Most U.S. states define three classes of e-bike, all limited to 750 W. The Discover ST 2.0's motor is rated at exactly 750 W, so it clears the first hurdle that many cheap fat-tire bikes fail.
| Setting | Behaviour | Class |
|---|---|---|
| As shipped | 20 mph limit, throttle and pedal assist | Class 2 |
| Raised to 28 mph in the display menu | 28 mph on pedal assist, throttle still stops at 20 mph | Check your state |
The second row needs care. Class 3 allows assist to 28 mph, but some states, California among them, do not allow a throttle on a Class 3 bike at all. If you raise the limit, read your state's definition first. Our e-bike class guide explains how.
The product title advertises a "Peak 1300W Motor" while the spec table lists 750 W with no peak figure. Classes are set by rated power, so the 750 W figure is the one that counts.
Is 60 miles realistic?
The battery is 48 V and 15 Ah. Multiply them and you get 720 Wh, which matches the listing. Good.
Sixty miles from 720 Wh means using 12 Wh per mile. That is achievable on a light bike at low assist on flat ground. A 77 lb bike on 4-inch tires is a different matter. Heavy fat-tire bikes ridden with moderate assist commonly use 18 to 25 Wh per mile, which gives 29 to 40 miles. Kingbull does say "under ideal conditions". Plan your commute on 30 to 40.
The charger is 3 A. Refilling 15 Ah at 3 A takes about five hours, plus a little for the top-off phase. The page does not state a charge time.
Battery certification
Kingbull claims the complete bike is certified to UL 2849, the battery pack to UL 2271, and that it uses Samsung 21700 cells. Those are the certifications New York City requires for sale, and the ones fire services tell buyers to look for.
A claim on a listing is not a certificate. Ask the seller for the certificate number or look the model up in the certifier's public database before relying on it for a building or insurance rule.
One small mismatch: the description calls the front fork an oil suspension fork, and the spec table says coil spring. It has 80 mm of travel and a lockout either way.
Key facts
As published by Kingbull or the sources named above, checked on 9 Oct 2026. Prices and terms change, so confirm them before you buy.
| Motor | Bafang 750 W rear hub, 80 Nm |
|---|---|
| Top speed | 20 mph as shipped; adjustable to 28 mph on pedal assist |
| Throttle | Twist, limited to 20 mph |
| Pedal assist | Torque sensor, 5 levels |
| Battery | 48 V 15 Ah (720 Wh), removable, Samsung cells |
| Range (claimed) | Up to 60 miles in ideal conditions |
| Charger | 3 A |
| Certification claimed | UL 2849 (bike), UL 2271 (battery) |
| Brakes | Hydraulic disc, 180 mm rotors |
| Fork | 80 mm travel, lockout |
| Tires | 26 x 4.0 in |
| Gearing | Shimano 7-speed |
| Weight | 77 lb |
| Payload | 400 lb; rear rack 150 lb |
| Rider height | 5 ft 5 in to 6 ft 5 in |
| Water resistance | IPX6 |
| Warranty | 2 years |
| Returns | 15 days |
| Price | $949.00 (list $1,399.00) |
FAQ
Is the Kingbull Discover ST 2.0 street legal?
As shipped it behaves as a Class 2 e-bike: 750 W, throttle and a 20 mph limit. That is legal as a bicycle in most U.S. states. Check local trail rules.
What is the real range?
The battery holds 720 Wh. For a 77 lb fat-tire bike, 30 to 40 miles is a realistic planning figure.
Is the battery UL certified?
Kingbull claims UL 2271 for the battery and UL 2849 for the bike. Ask for the certificate number to confirm.
Did you ride it?
No. This review is based on Kingbull's published listing, the text of the law and our own arithmetic.
Verdict
The Discover ST 2.0 does what many budget fat-tire bikes do not: it stays inside the 750 W limit, claims the right UL certifications and includes a torque sensor and hydraulic brakes for $949. Halve the optimism in the range figure and confirm the certificates, and it is easy to recommend on paper.
Product names and trademarks belong to their owners. This review is general information, not professional advice.