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Haibike sDuro HardFour RX Kids 24 2016 Yamaha

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Who is this bike suitable for?

This one's pretty obvious - It's for kids who require that little bit of assistance! This 24" wheeled unisex kids electric bike is suitable for children ranging from the age of 9 onwards. A kids specific chassis and refined Yamaha eBike system.

After much research into e-mountain bikes, and visiting a number of dealers, I was blown away by the brilliant service given at e-bikeshop. Martin really knows his stuff, and took into account everything I was looking for in an e-bike. I am now the very proud owner of an AWESOME Haibike, and am totally confident in the back up and aftersales. If you want an e-mountain bike, get down to e-bikeshop!!

New Features

For 2016 an all new sDuro model! Finally we have a 24" kids electric bike. Do your children get fed up and tired mid way through the ride? 

Do you want to ride further with your family? Or does your child require some support?

The new Haibike sDuro HardFour RX is the answer!

The sDuro HardFour RX offers refined kids geometry and a smaller 24" wheel. Suitable for boys or girls with an average age of 8 onwards. 

This simple spec'd bike is great for children and Haibike have included a refined version of the 2016 Yamaha system, learn more further down the page.

Acera Mech on 2016 sDuro HardFour RX

The 2016 sDuro HardFour RX features a 9 speed Shimano Acera gear system with simple to use trigger shifters to give the kids full versatility across varied climbs and descents. Remember with crank drive you can use the gears with the assistance.

Tektro Auriga Disc Brakes on Haibike sDuro HardFour RX

The smaller 24" wheels offer kids full control and stability. Small enough to manoeuvre around, but big enough to take on a full day's ride and follow the parents through varied terrain. 

Although kids sized wheels, Haibike have built them with decent disc hubs and double wall rims.

On the 2016 sDuro HardFour RX we see the Tektro hydraulic disc brakes. Simple to use and fairly maintenance free, it's a good option on this 24" kid's bike. 

With the electric assistance we want to ensure braking power remains solid.

Thrown into the mix are a set of 24" Schwalbe Table Top tyres. Both lightweight and durable in their construction, they allow a faster rolling resistance while maintaining grip at the same time. A good choice for a mixture of surfaces.

We are excited about this bike, for the first time ever we can offer a proper German crank drive Yamaha eBike. Finally you can take the kids on a full ride out without the stresses and strains of them getting worn out after a short distance. Ultimately this equals more ride time, more ride time = more fun. It's a winner all round!

2016 Yamaha eBike System on Haibike sDuro Kids eBike

Yamaha eBike System

The new Haibike sDuro HardFour RX is powered by the latest Yamaha electric bike system. Haibike has partnered with Yamaha to bring a brand new line of sDuro eBikes, this 250w motor offers up to 280% assistance and peaks at 60Nm of restricted torque (on this kids version).

The assistance is set in 3 levels on the kids version - 'Eco', 'Standard' & 'High'. This allows the child to fine tune the amount of assistance required. We also see a new set of controls that loose the LCD screen in replace of simple on / off power and assistance, easy to use buttons.

The Haibike sDuro Hard Four RX 2016 eBike is offered with the largest 400Wh Yamaha battery to give a full day's ride time. Now your son / daughter can join you for the longer rides too!

On the Kids version the assistance speed is lowered down to 12.5mph. We want children to have fun whilst maintaining a safe pace. We also remove the walk assist and simplify the levels to make it as user friendly as possible. 

You can learn more / read reviews of the Yamaha eBike system on our blog pages. 

Whats included?


This bike comes fully set-up by our workshop technicians. You can be sure that every aspect of the eBike has been dialled in for optimum performance. All our electric bikes arrive with a user manual, keys, charger & free follow up service within 3 months.

Support on the Haibike sDuro HardFour RX 2016

Our electric bikes also include a 5yr warranty on the frame, 2yr warranty on all the electrics & 1yr warranty on the components. In the event of a problem, we handle all warranty claims in-house. We can also offer remote worldwide support.

E-bikeshop is a UK Yamaha Electric Bike Service Center and our in house workshop is now exclusively reserved for our own eBike customers. We also have parts / spares to hand should they be required.

*Range is dependant on many factors inc rider weight, wind, hills, terrain etc. For a better estimate, please use our range calculator. 

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General Bike Specifications


Alu 6061, Hydro Formed, Yamaha Gravity Casting Interface


Suntour XCR Air, Lockout, 63mm Tapered

Rear Shock



Tektro Auriga 160mm


Shimano Altus Trigger 9 Speed

Rear Mech

Shimano Acera 9 Speed


Shimano HG20, 11-34 Teeth, 9-Speed


KMC X9e 9 Speed


XLC EVO Quick Release Hubs on Rodi FW Disc Rims


Schwalbe Table Top 24x2.25


sDuro ePerformance Lowriser Alloy


sDuro Alu, A-Head 1 1/8" 31.8


FSA no. 57, A-Head, semi-integrated


sDuro Alloy 31.6mm


Haibike Kids MTB


19.4 kg

Electric Bike Specifications


Yamaha Lithium Ionen 36 Volt, 400 Wh, with BMS Management


Yamaha multifunctional display


Yamaha Crank Drive 36V 250 Watt. 50 - 280% Assist, 60Nm


40-100 miles of power assisted range, depending on terrain

Further Information


The most frequently asked questions on this eBike -

These questions relate to this bike. You can find a full F.A.Q on general eBike & website questions by clicking here.

What sizes is this bike available in?
The Haibike sDuro HardFour RX 2016 is available in one frame size for kids: 24" Wheels 34cm (13") frame.

Is this bike in stock now?
The stock status is shown at the top of this page next to the price. If the stock level is shown as 'Pre-Order' this means it is a new model arriving soon, you can see an expected date at the top of each bike description.

Are there any colour options?
No, the sDuro HardFour RX 2016 bike is only available in the colour shown.

Where can I find a geometry chart of this bike?
You can find the geometry chart of each bike by clicking on the 'Downloads' tab of each bike.

How fast will this bike go?
This bike will assist you to 12.5mph. From there you can pedal faster, but with no assistance.

Where can this bike be ridden?
Under UK law a rider needs to be aged at least 14 to ride an Electrically Assisted bike on the road or any other public place.

Where is this bike made?

Can I try the bike before I buy?
Yes of course, you can visit, we can talk you through your riding style and requirements and offer expert advice as to which model to select. We will be able to advise particular eBikes and talk them through in more detail. We also give you the opportunity to ride crank drive bikes so you can get a feel for them prior to purchase. 

At e-bikeshop we work by appointment only, so we can talk to each customer on an individual basis to give the best advice possible. If you like the bike, you have the option to take it away there and then with any accessories selected fitted and a full fitting session on the bike itself. We ask you to go for a short ride on the bike to make sure you are happy with the setup and also able to answer any operational questions you may have. 

If you cannot find the answer you are looking for, please do not hesitate to get in touch.
Remember you can find a full F.A.Q on general electric bike & website questions by clicking here.

The following links will open PDF files in a new tab -


Yamaha eBike System Overview - Yamaha eBike System Overview

Yamaha eBike Review - Yamaha Electric Bike System Review

Winora Bike Manual - Winora Group eBike Manual

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Finance Options

The prices below do not include any additional products, product options or shipping costs.
To pay by finance select the finance option during the checkout process.
Finance is only available for UK residents.

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The above values are best estimates, Final pricing will be confirmed on the V12 Retail Finance application. The UK Electric Bike Company Ltd is registered in England and Wales 08775019. Registered office: 12 Borelli Yard, Farnham, Surrey, GU9 7NU. The UK Electric Bike Company Ltd acts as a credit broker and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. The UK Electric Bike Company Ltd is authorised and regulated by the Financial Conduct Authority. Our firm reference number is 659966. Credit provided subject to age and status.