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RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
RFN Warrior SX-E400 Electric Bike - Orange Blue
4.9Excellent241 reviews on Trustpilot

RFN Warrior SX-E400 Electric Bike, Orange Blue

£499.00 £599.00 £100 off

or 3 payments of £166.33 with Klarna

Pay in 3 with Klarna

  • Split your purchase into 3 interest-free payments, taken every 30 days.
  • Choose Klarna at checkout. No fees when you pay on time.
  • 18+, UK residents only. Credit subject to status. T&Cs apply.
  • Missed payments may affect your ability to use Klarna and could affect your credit score.
Pre-order Order now to reserve yours

Why buy from Garland

  • Authorised UK dealer
  • Tracked UK courier delivery
  • Manufacturer warranty included
  • UK parts & aftersales support
  • Delivered 85 to 90% assembled
  • Quick & simple setup, tools included
  • Ready to ride in 10 to 15 minutes

Off-road use only. Not road legal. Ride on private land with the landowner's permission. Read more

No reviews
Arrives boxed, 85 to 90% assembled You complete the last few steps before riding, with tools included. This bike is not available fully assembled.
Tracked UK courier delivery Sent from our UK warehouse. Estimated delivery date shown at checkout.
Delivery info
30-day returns On unused items in their original packaging.

Delivery information

Arrives boxed, 85 to 90% assembled You complete the last few steps before riding, with tools included. This bike is not available fully assembled.
  • Sent from our UK warehouse by tracked courier, such as APC Overnight.
  • Tracking details are emailed once the courier has your order.
  • An adult may need to be in to receive larger deliveries.
  • Parts and accessories may arrive separately from your bike.
  • Delivery can take longer around bank holidays, Black Friday and Christmas.
  • We are online only, so collection is not available.

Returns

  • Changed your mind? Return unused items within 30 days of delivery.
  • Items must be unused, undamaged and complete, with all accessories and original packaging.
  • A bike that has been ridden or used may be refused, or refunded at a reduced value.
  • Arrived damaged or incorrect? Contact us promptly, ideally within 48 hours, with your order number and photos.
  • Return postage is paid by you for a change of mind. We cover it if the item is faulty or incorrect.
  • Refunds go back to your original payment method within 14 days of us receiving the item.
  • Please contact us before sending anything back, so we can give you return instructions.

This does not affect your statutory rights.

  • 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

    Mode Speed Best For
    Eco 5mph Gentle introduction for new riders
    Low 8mph Building confidence and throttle control
    Sport 15.5mph More capable riders using full performance

    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

    Battery Charge Time Range / Ride Time
    36V 5.2Ah lithium 160 minutes to 100% / 120 minutes to 80% Up to 11 miles or around 75 minutes

    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

    Battery 36V 5.2Ah lithium
    Motor 36V brushless motor (250W rated / 400W peak)
    Speed Modes 5mph / 8mph / 15.5mph
    Seat Height 46cm
    Recommended Rider Height Approximately 90–110cm
    Charge Time 160 mins to 100% / 120 mins to 80%
    Range Up to 11 miles
    Brake 140mm rear disc brake
    Tyres 12 x 2.4-inch all-terrain
    Weight 18kg
    Maximum Rider Weight 50kg
    Throttle Twist grip
    Warranty 6 months parts only

    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.

    Helpful RFN Warrior Guides

    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.

  • Delivery & Returns

    Customers have 30 days from when an item arrives to return a purchase to us. All items must be returned in new/unused condition and in original packaging.

    RFN Warranty Please Read*

    It is advised to keep your original box and packaging throughout your bikes warranty period of 6 months in case the bike needs to be returned to us.

    Bikes come with a six-month warranty for manufacturing defects on all major parts.

    RFN Bikes are not responsible for any damage caused by incorrect assembly. So please be sure to take care in assembling your bike as the spare parts are difficult to come by. Ensure ALL bolts and components are tightened and properly lubricated.

    This limited warranty does NOT cover normal wear and tear parts, bearings, tyres, tubes, chains, sprockets, cables or any damage, failure or loss caused by improper assembly, maintenance, storage or use of the Amped product.

    This limited warranty will be void if this product is ever: Used in a manner other than for recreation and transportation. Modified in anyway.  Used in wet conditions.

    4. Warranty is a PARTS ONLY WARRANTY, It does NOT include labour. If the bike needs to be repaired by us, the bike needs to be returned to us (the place of purchase) at the CUSTOMERS cost. 

    5. Please note if you order a bike for delivery outside of the UK and Ireland you will be liable for the price of postage for any parts supplied under our warranty! Postage cost is only covered on warranty parts to the UK and Ireland.

Reviews

What our customers say

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Revvi full-face helmet sizes

How to measure

Measure around the widest part of the rider's head. The tape should pass above the eyebrows and ears and around the fullest part at the back of the head.

SizeHead circumference
XS, Extra Small48 to 50cm
S, Small51 to 54cm
M, Medium55 to 58cm
L, Large59 to 61cm

Always choose by the rider's actual head measurement, not by age. Head shape can also affect how a helmet fits.

Between sizes? Do not automatically choose a larger helmet for growing room. A helmet must fit securely now. If the rider falls between sizes, check the fit carefully before use.

Amped AMP-1 helmet sizes

How to measure

Measure around the widest part of the rider's head. The tape should pass above the eyebrows and ears and around the fullest part at the back of the head.

SizeHead circumference
M, Medium54 to 58cm
L, Large58 to 62cm

Always choose by the rider's actual head measurement, not by age. Head shape can also affect how a helmet fits.

Measuring exactly 58cm? That falls in both sizes. Fit varies with head shape, so check the measurement and that the helmet sits securely before use. Do not choose a loose helmet to allow growing room.

Revvi riding jersey sizes

Choosing a size

The Revvi Kids Riding Jersey comes in dedicated sizes for younger children and growing youth riders. Select the size before adding it to your basket.

SizeAge guide
Age 2About 2 years
Age 3About 3 years
Age 4About 4 years
Age 5About 5 years
YS, Youth SmallAges 6 to 7
YM, Youth MediumAges 8 to 9
YL, Youth LargeAges 10 to 11

Ages are a guide only. Consider the child's height, build and preferred fit too.

Between sizes? If the rider is between sizes, still growing or likely to wear a base layer underneath, the larger size may be more comfortable.

Kids riding jersey sizes

How to measure

Compare these with a jersey or long-sleeve top that already fits the rider well. Chest width is measured across the front with the jersey laid flat, so it is half the full chest.

SizeAge guideHalf chestLength
2 to 3Ages 2 to 331cm49cm
3 to 4Ages 3 to 433cm51cm
4 to 5Ages 4 to 535cm53cm
5 to 6Ages 5 to 637cm55cm
6 to 7Ages 6 to 739cm57cm
YS, Youth SmallAges 7 to 941cm59cm
YM, Youth MediumAges 9 to 1145cm63cm
YL, Youth LargeAges 11 to 1449cm67cm

Ages are a guide only. The chest width and body length are the best way to choose.

Riding glove sizes

How to measure

Palm: straight across the widest part of the palm, not including the thumb.
Length: from the base of the wrist to the tip of the longest finger.

SizeAge guidePalm widthHand length
2 to 3Ages 2 to 36.5cm11.5cm
4 to 5Ages 4 to 57cm12cm
6 to 7Ages 6 to 77.5cm12.5cm
YS, Youth SmallYouth Small8cm13.5cm
YM, Youth MediumYouth Medium8.5cm14cm

Use the measurements rather than age alone. Hand shapes vary, so check both wherever possible. Once fitted, make sure the rider can comfortably use the throttle, brakes and every handlebar control.

Between sizes? The larger size usually gives a more comfortable fit and a little growing room, but the glove must not get in the way of safe control of the bike.
RFN Warrior SX-E400 Electric Bike - Orange Blue
£499.00