Kingbull Hunter 2.0S 1300W Fat-Tire Mountain E-Bike

750W rated rear hub with 85 Nm torque (Kingbull markets 1300W peak, a brief boost) is a sensible spec for a 77-lb bike on fat tires. 85 Nm is level with the Jasion EB5 MAX (85 Nm) and sits between the two figures Vivi publishes for the Vivi ACE07 (80 Nm in one place, 90 Nm on its current listing), all at the same 750W rated. The older Hunter 2.0 was listed at 95 Nm; Kingbull gives 85 Nm for the 2.0S. We have not ridden it, so we cannot tell you how it climbs. Cadence-sensor pedal assist is the common limitation at this price tier, though not universal: the Vivi ACE01 lists a torque sensor.

The 864 Wh battery (48V × 18Ah) is the biggest of the three: the EB5 MAX and ACE07 carry 720 Wh, and the Heybike Cityscape 2.0 468 Wh. Kingbull claims 80 mi, which works out at under 11 Wh per mile, only plausible in the lowest assist on flat pavement with a light rider. Our planning estimate, not a measurement, for mixed fat-tire riding (PAS 3, a 180-lb rider, singletrack + fire road) is 33-43 mi per charge, about 26 mi at a sustained 28 MPH on the road, with cold weather (below 50°F) typically costing another 15-20%. Plan around 36 mi for mixed off-road, 26 mi for sustained road speed.

Unlike the Vivi ACE07 (commuter step-through with fat tires) or Jasion EB5 MAX (high-top-tube commuter with fat tires), the Hunter 2.0S is genuinely designed for off-road riding:

• Knobby tread fat tires: the CST 26x4.0 tires (model C-1752, per Kingbull) that ship on this bike have aggressive off-road tread, unlike the more street-oriented fat tires on the ACE07 / EB5 MAX
• Mountain-bike geometry: longer wheelbase, slacker head angle, lower bottom bracket clearance than the commuter-tire fat bikes
• Front suspension fork: 100 mm of travel on a spring (not air-sprung) fork

That said, this is still a 77-lb e-bike, not a 35-lb trail mountain bike. It rolls over rough terrain via mass and tire footprint rather than precision suspension travel. Genuine technical singletrack is still beyond its design envelope; fire roads, doubletrack, gravel, and rough urban pavement are its sweet spot.

28 MPH pedal-assist capability means the Hunter 2.0S is also a credible road bike when you're not on trails. The Class 3 trade-offs apply: banned from shared-use paths by default in Washington, Colorado, California (with mandatory all-ages helmet); restricted in New York (25 MPH cap + NYC-only); allowed at the state level in Texas and Florida. Check your state before assuming you can take this on the local trail network at full speed.

Two-piston hydraulic disc brakes front and rear on 180mm rotors, appropriately sized for the bike's mass and Class 3 speed. The front suspension fork has 100mm of travel per the listing, adequate for the bike's intended use (fat tires absorb most of the small bumps anyway). Shimano's 7-speed drivetrain is standard. Integrated headlight, taillight and brake light wired to the battery; a rear rack rated to 150 lb and full fenders are standard, the stated total payload is 400 lb, and Kingbull rates the bike IPX6 for water resistance.

Kingbull warranty: 2 years on motor, battery, and frame; 1 year on components. This is meaningfully longer than Jasion (1 year motor/battery) and Vivi (1 year motor/battery, 6 months frame), and on par with Heybike and Velotric. California-based service team handles warranty claims via phone + email.

Buy this if you want a full spec sheet under $1,000 (hydraulic brakes + front suspension + 864 Wh + Class 3 + fat tires + 2-year warranty is uncommon at this price), if your riding mix includes genuine off-road (fire roads, gravel, light singletrack) where the Hunter 2.0S's geometry + knobby tires actually earn their keep, or if you want a Class 3 fat-tire bike with US-based phone support (vs the Amazon-only Jasion). Skip this if your riding is 100% smooth pavement (fat tires hurt range without benefit; Heybike Cityscape 2.0 is the better paved-Class-3 pick), if you need a step-through frame (Vivi ACE07 or Jasion Roamer ST), or if you want genuine trail-MTB capability (this is an over-built road/light-trail bike, not a real MTB, so spend up to Specialized Turbo Tero / Trek Rail).