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Deal.ai › Compare

HappyRun F18 2.0 Electric Dirt Bike vs KAIJIELAISI K801 Electric Dirt Bike

Buy the HappyRun F18 2.0 if you want a true mid-drive dirt bike with strong climbing torque, a reverse gear and a seat height that fits shorter riders and teens. Buy the KAIJIELAISI K801 if you want the bigger 60V 35Ah pack and fat knobby tires for loose terrain and longer trail rides. The HappyRun has the better motor layout and rider fit; the K801 has the larger battery and more tire contact. Both are off-road machines, not street-legal e-bikes, and both are heavy and need OHV access.

  • Choose the HappyRun F18 2.0 if you want mid-drive climbing torque, a reverse gear and a low 26.5-inch seat that fits riders from about 3'11" to 6'1".
  • Choose the KAIJIELAISI K801 if you want the larger 60V 35Ah battery and 26-inch knobby fat tires for loose dirt and longer off-road runs.

Prices

  • HappyRun F18 2.0 Electric Dirt Bike: $999.00 at happyrunbike (last seen Nov 13)
  • KAIJIELAISI K801 Electric Dirt Bike: $1,419.00 at KAIJIELAISI (last seen Nov 13)
  • Difference: the HappyRun F18 2.0 Electric Dirt Bike is $420.00 cheaper than the KAIJIELAISI K801 Electric Dirt Bike at the latest prices (Nov 13)
HappyRun
HappyRun F18 2.0 Mid-Drive 6000W Electric Dirt Bike

HappyRun F18 2.0 Electric Dirt Bike

HappyRun F18 2.0 Mid-Drive 6000W Electric Dirt Bike

5(6 ratings)
$999.00at happyrunbikeChecked Nov 13
See all prices and details
Visit happyrunbike
Pros
  • Mid-drive motor gives better climbing efficiency and traction on loose ground
  • 245 Nm peak torque for strong acceleration out of corners
  • Low 26.5-inch seat fits shorter adults and supervised teens
  • Reverse gear helps in tight spaces; NFC unlock and kill switch add convenience
Cons
  • Smaller 1620Wh pack than the K801
  • Not a Class 1, 2 or 3 e-bike; off-road and OHV-permitted use only
  • Ships 80% assembled, so final assembly is on you
KAIJIELAISI
KAIJIELAISI K801 Electric Dirt Bike

KAIJIELAISI K801 Electric Dirt Bike

5(3 ratings)
$1,419.00at KAIJIELAISIChecked Nov 13
See all prices and details
Visit KAIJIELAISI
Pros
  • Larger 60V 35Ah battery for longer off-road range
  • 26-inch knobby fat tires grip loose dirt and add stability
  • Dual hydraulic brakes and heavy-duty full suspension
  • LCD meter, anti-theft lock and air pump included
Cons
  • Fat-tire design is heavier and less like a traditional dirt bike
  • No published seat height or rider-height range
  • No reverse gear or NFC unlock listed

What separates them

HappyRun F18 2.0 Electric Dirt BikeKAIJIELAISI K801 Electric Dirt Bike
Motor layoutMid-drive, 6000W peak, 245 Nm peak torque6000W peak, layout not stated as mid-drive
Battery capacity60V 27Ah (1620Wh) per the product page60V 35Ah, roughly 2100Wh
Seat height and fit26.5-inch seat, riders about 3'11" to 6'1"Not published; fat-tire frame, less traditional dirt-bike geometry
TiresDirt-bike knobby tires26-inch knobby fat tires
SuspensionHydraulic fork plus hydraulic and spring rear shockReinforced heavy-duty full suspension
BrakesHydraulic brakesDual hydraulic brakes
Top speed46 mph72 km/h (about 45 mph)
ExtrasReverse gear, NFC unlock, magnetic kill switch, color display, helmet in the boxLCD meter, anti-theft lock, air pump

Price history

  • HappyRun F18 2.0 Electric Dirt Bike: lowest $1,099.00 on Nov 6 at EZWheel USA; $1,099.00 on Nov 13.

Prices at every store

HappyRun F18 2.0 Electric Dirt Bike

  • happyrunbikeNew

    In stockReturn policy

    $999.00Checked Nov 13
    Visit happyrunbike
  • HappyRunNew

    In stock

    $1,099.00Checked Nov 13
    Visit HappyRun
  • eBike HaulNew

    In stockReturn policy

    $1,159.00Checked Nov 13
    Visit eBike Haul
  • EZWheel USANew

    Availability unknown

    $1,099.00Checked Nov 6
    Visit EZWheel USA
All 7 stores and price history →

KAIJIELAISI K801 Electric Dirt Bike

  • KAIJIELAISINew

    In stockReturn policy

    $1,419.00Checked Nov 13
    Visit KAIJIELAISI
Prices and history →

Specs compared

SpecHappyRun F18 2.0 Electric Dirt BikeKAIJIELAISI K801 Electric Dirt Bike
Peak motor power—6000W
Tire size—26” Fat Tire
Suspension—Full Suspension
Brake type—Dual Hydraulic Brake
Battery capacity—60V 35Ah large-capacity battery
Max off-road speed—72km/h
Tire type—professional knobby off-road tires
Suspension type—Reinforced heavy-duty full suspension
Included accessories—LCD meter, anti-theft lock & air pump

Questions and answers

Which is better for steep climbs?
The HappyRun F18 2.0. Its mid-drive motor and 245 Nm peak torque put power through the drivetrain for stronger climbing and more consistent traction than a hub-style setup.
Which has the longer range?
The KAIJIELAISI K801 on paper. Its 60V 35Ah pack is larger than the HappyRun's 1620Wh pack, so expect more miles per charge, though terrain and throttle use decide the real number.
Which fits a shorter rider?
The HappyRun F18 2.0. Its 26.5-inch seat and 3'11" to 6'1" rider range suit shorter adults and supervised teens. The K801 does not publish a seat height, so sit on one before buying.
Are either of these street legal?
No. Both are off-road machines well above the 750W and 20 mph federal low-speed e-bike limits. Ride them on private property with permission, closed motocross courses or OHV-permitted trails, and check your state's registration rules.
Is the K801 worth stepping up to over the HappyRun?
Only if battery capacity and fat-tire grip matter more to you than motor layout and fit. The HappyRun gives better climbing and a wider rider range; the K801 gives a bigger pack and more tire contact.
Which is easier to live with day to day?
The HappyRun, thanks to its reverse gear for tight spaces, NFC unlock and magnetic kill switch. The K801 counters with an included anti-theft lock and air pump.

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