RFN Warrior SX-E400 Electric Bike - Green Pink
£499.00
£599.00
£100 off
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Description
RFN Warrior SX-E400 – Quick Overview
Best for: young riders aged around 3–6 years old.
Recommended rider height: approximately 90–110cm.
Motor: 36V 250W brushless motor, 400W peak.
Seat height: 46cm.
Speed settings: 5mph / 8mph / 15.5mph.
Our view: a proper first electric MX-style bike for young riders who want motorbike looks with controlled, confidence-building power.
The RFN Warrior SX-E400 is a true first electric MX-style bike for younger riders who want real motorbike looks with smooth, controlled electric power.
Built for riders aged around 3–6 and approximately 90–110cm tall , it combines a 36V brushless motor, proper suspension, all-terrain tyres, safety features and three speed modes to help young riders build confidence safely.
For parents choosing a child's first powered off-road bike, the SX-E400 is also featured in our Best RFN Warrior for Beginners guide.
The SX-E400 sits at the beginning of the RFN Warrior Kids range , alongside the larger SX-E500 and flagship SX-E700 .
You can also read our full RFN Warrior SX-E400 review for a more detailed look at who the bike suits, how it performs and where it sits within the wider RFN range.
My Take as a British MX Rider
The RFN Warrior SX-E400 is a great option when a child wants something that feels more like a real little motorbike rather than a balance bike.
The key is that it still keeps the power manageable. The lower speed modes, magnetic kill switch and smooth controller make it much more parent-friendly than simply giving a young rider too much bike too early.
It is compact enough for younger riders to feel in control, while the proper MX-style riding position, suspension and off-road tyres give it a much more authentic motorbike feel than a basic electric balance bike.
For a young rider who wants proper MX styling but still needs controlled progression, the SX-E400 is a strong first step.
Why Choose the RFN Warrior SX-E400?
First MX-Style Bike
Real off-road styling for young riders who want a proper little electric motorbike feel.
Three Speed Modes
5mph, 8mph and 15.5mph settings allow parents to control progression from day one.
Safety Features
Magnetic safety kill switch, speed-setting cover and full chainguard help protect younger riders.
Removable Battery
The 36V 5.2Ah lithium battery provides up to 11 miles or around 75 minutes of ride time.
Built for Young Riders
Best for Ages 3–6
The RFN Warrior SX-E400 is generally designed for riders aged around 3–6 and approximately 90–110cm tall .
With a 46cm seat height, 18kg weight and maximum rider weight of 50kg, it gives younger riders a stable and planted feel while still remaining manageable.
The lower seat height helps smaller riders feel more secure when stopping, starting and learning basic throttle control.
Suitability always depends on the individual child’s height, weight, confidence and riding ability, at the parent’s discretion.
For a wider comparison across all three kids models, use our RFN Warrior Size Guide , or compare the range using our Best RFN Warrior by Age and Best RFN Warrior by Height guides.
Speed Settings
Parents can begin in the lowest setting and increase the speed gradually as the rider becomes more confident with balance, braking and throttle control.
Smooth Power and Safety Features
The 36V brushless motor uses a sine-wave controller to deliver smooth, predictable acceleration. This avoids an unnecessarily harsh initial response and gives younger riders more confidence when first learning to use a throttle.
Controlled from Day One
- 36V brushless motor
- 250W rated output
- 400W peak output
- Sine-wave controller for smooth power delivery
- Three selectable speed settings
- Speed-setting cover to prevent accidental mode changes
- Magnetic safety kill switch with lanyard
- Full chainguard to cover moving parts
These features make the SX-E400 a strong first electric MX-style bike for younger riders who need manageable performance and gradual progression.
Suspension, Tyres and Braking
Front and rear suspension help absorb bumps and uneven terrain, keeping the bike more stable and confidence-inspiring across grass, dirt and mixed surfaces.
The 12-inch all-terrain tyres provide more grip and off-road capability than smooth balance-bike-style tyres, while the rear disc brake gives the rider controlled stopping performance.
Off-Road Ready Setup
- Front and rear suspension
- 12 x 2.4-inch all-terrain tyres
- 140mm rear disc brake
- Stable 18kg chassis
- MX-style riding position
- Suitable for grass, dirt and private off-road terrain
The result is a first electric bike that feels much more like a real little off-road machine.
Battery, Range and Charging
The removable battery can be charged away from the bike and replaced with a spare charged battery to extend riding time.
Actual range and ride time will vary depending on rider weight, terrain, speed mode, riding style and conditions.
For more information about the bike and UK ownership, read our RFN Warrior SX-E400 Electric Bike UK guide .
What's in the Box?
- RFN Warrior SX-E400 electric bike
- 36V 5.2Ah lithium battery
- UK charger
- Owner's manual
- Tool kit
The SX-E400 arrives semi-assembled with the controls pre-installed. Final assembly is straightforward and can normally be completed with the supplied tool kit.
RFN Warrior SX-E400 Specifications
Warehouse Stock, Setup & Fast UK Delivery
Delivered Semi-Assembled
RFN Warrior bikes are supplied semi-assembled and require final setup before first use.
Each bike includes the required tool kit, UK charger and owner's manual.
Assembly should always be completed by a mechanically competent adult. Before riding, all controls, fasteners, brakes and moving components should be checked and adjusted where required.
For more information, read our Warehouse & Dispatch Guide.
Need Help Choosing the Right RFN Warrior?
If you're still deciding whether the SX-E400 is the right bike, these buying guides compare every RFN Warrior model by age, height, experience and rider size.
RFN Warrior Size Guide
Compare all RFN Warrior models side by side.
Best RFN Warrior by Height
Choose by rider height.
Best RFN Warrior by Age
Choose by rider age.
Best RFN Warrior for Beginners
Find the easiest model to start with.
More SX-E400 Buying Advice
- RFN Warrior SX-E400 Review
- What Age Is the RFN Warrior SX-E400 For?
- SX-E400 Seat Height & Rider Size Guide
- Best Place to Buy RFN Warrior SX-E400
Everything you need to know before ordering.
Helpful RFN Warrior Guides
What Age Is The RFN Warrior SX-E400 For?
See whether the SX-E400 is the right choice based on age and riding experience.
SX-E400 Seat Height & Rider Size Guide
Check rider height, seat height and sizing before ordering.
RFN Warrior SX-E400 Review
Read our full review after taking a closer look at the SX-E400.
RFN Warrior SX-E400 Electric Bike UK
Everything you need to know before buying in the UK.
Best Place to Buy RFN Warrior SX-E400
Learn why so many families choose Garland Powersports.
SX-E400 vs SX-E500
Compare the two smallest RFN Warrior models side by side.
RFN Warrior Size Guide
Compare every RFN Warrior model by size, height and ability.
RFN Warrior Kids Range Explained
Understand where the SX-E400 fits within the complete RFN Warrior range.
Why Buy From Garland Powersports?
Garland Powersports is a UK specialist in kids electric bikes, electric dirt bikes and off-road machines. We provide honest buying advice, UK stock, fast dispatch and genuine after-sales support.
UK Stock
RFN Warrior bikes are stocked in the UK for quick dispatch.
Specialist Advice
We'll help you choose the right model rather than simply the most expensive one.
Assembly Options
Choose boxed delivery or a fully assembled and PDI-checked bike.
After-Sales Support
Support from a genuine UK specialist before and after your purchase.
Our Verdict
The RFN Warrior SX-E400 is one of the best first electric MX-style bikes available for younger riders wanting a proper off-road riding experience.
Smooth power delivery, sensible speed settings, quality suspension and genuine RFN build quality make it an excellent platform for developing riding skills safely.
If your rider is around 3–6 years old, approximately 90–110cm tall and ready for their first true electric motocross-style bike, the RFN Warrior SX-E400 is an outstanding choice.
Ready for Their First MX-Style Bike?
Order the RFN Warrior SX-E400 online from Garland Powersports with fast UK delivery available.
First electric MX-style bike for riders aged around 3–6 and approximately 90–110cm tall.
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Delivery & Returns