Haibike Sduro HardFour 4.0
A kids' off road electric mountain bike with 24" wheels

no longer sold- $ 2,599

Haibike Sduro HardFour 4.0


  • No longer available: This model is no longer available from The New Wheel. We have many other fantastic bikes to choose from.
  • browse our electric bike selection or, if you aren't sure which model is best for you, let us help you find a bike.

  • Yamaha performance: A Yamaha middle-motor system offers near silent motor performance with awesome torque the instant you start to pedal.
  • Serious components for smaller riders: SR Suntour XCR LO suspension fork sports 63mm travel and Alex rims with Schwalbe tires mean performance and longevity
  • Climb with confidence, descend safely: 9-speed Shimano drivetrain offers a wide gear range for little riders, while Tektro hydraulic disc brakes will stop on a dime.
  • Durability in mind: Yamaha LED console displays key information while durable and reliable. Haibike's unique composite Skid Plate protects motor from damage
  • 34 cm frame fits riders up to 4'10": Haibike frame accommodates a range of smaller riders, starting at around 4' in height
  • Max speed with assist: 12mph: To ensure the safety of our younger riders, the HardFour 4.0 has a top assist speed of 12mph

You Get So Much More

Complimentary Service
Your new electric bike comes standard with 6 months of complimentary service. To help ensure that your bicycle works great over its lifetime, we'll include a useful service schedule and can even send you handy reminder emails.
Extended Service Options
Professional electric bike repair
Expert Service
The New Wheel’s commitment to service is paramount. Throughout the lifetime of your bike, beginning from when it is built and tuned to our exacting standards, we will work to ensure that your bike continues to perform reliably and enjoyably.
Book an Appointment Today
Service Membership
Bikes purchased from The New Wheel are eligible for one of our unique Service Memberships. Each service membership not only includes unlimited tune-ups but also 24/7 nationwide roadside assistance for total peace of mind.
Purchase a Service Membership

Our Take

Is this the ultimate middle school commute machine? The Hard Four from Haibike definitely takes kid commute to the next level.

Featuring 24″ wheels, front suspension, and an aluminum frame sized for folks under 5′, the Hard Four has a big attitude for such a small bike. The drive system is by Yamaha and is plenty powerful.

If taking on steeper hills off road with your tween is exciting, the Hard Four will make this more than possible. And with a 500 Watt-hour battery, standard, you’ll be able to ride all day if you wish. Hydraulic brakes, double-wall eyeletted rims, and Schwalbe tires round out this quality package.


  • Size 34cm
    Fork SR Suntour XCR LO Lockout, air/oil, Travel: 63mm
    Frame 6061 Hydroformed Aluminum + Gravity Casting Interface
    Rims Rodi FW Alloy Disc - with eyelets
    Hubs XLC aluminium disc, quick release axle
    Tire Schwalbe Table Top Performance, 57-507
    Seat Selle Royal Hello
    Seat Post Haibike Components TheSeatpost +
    Brake Tektro HD-M286, aluminium, 160mm front
    Transmission Shimano Acera M3000, 9-speed
    Shifter Shimano Altus M370, rapidfire
    Gear Ratio Front: 32, Rear: 11-34t
    Handlebars Haibike Components TheBar+, 31.8, 640mm
    Headset A-Head Tapered
    Stem Haibike Components TheStem +
  • Motor Yamaha PW-System, 250W
    Power Pack Yamaha Lithium Ion, 400 Wh
    Console Yamaha LED
    Ride Mode Torque Sensed Pedal Assist
    Max Range 50 miles
    Top Motor Assist Speed 20 mph
  • Front Light Optional
    Rear Light Optional
    Fender Optional
    Rear Carry Rack Optional
    Chain Guard yes
    Kickstand Optional
Specs subject to change, errors, and omissions.

Meet Amo

“Nobody buys a car so that they can crawl at 10-15 miles an hour.”
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Meet Julie

“An ebike was life-changing. I tend to be more of a home-body, but this lets me explore the city in a way I never would have without it."
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