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Giant ARX 20 lightweight kids’ bike with 20" wheels, alloy frame, and child-specific components—ideal for ages 5–8. Available in Phoenix Fire, Cobalt, Soap Suds, and Lime Punch.
Giant ARX 20 lightweight kids’ bike with 20" wheels, alloy frame, and child-specific components—ideal for ages 5–8. Available in Phoenix Fire, Cobalt, Soap Suds, and Lime Punch.
Giant

2026 Giant ARX 20 - 5-9yr Kids Bike - Lime Punch

£364.00 £429.00 15% off
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Pre-Launch

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Estimated Delivery & Collection Dates

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2026 Giant ARX 20 - 5-9yr Kids Bike - Lime Punch

Season:2026

Brand:Giant

Code:9012002410

Lightweight. Confident. Built to grow.

The Giant ARX 20 is a premium kids’ bike designed for children aged 5 to 8 who are ready to ride further, faster, and with more independence. With its lightweight aluminium frame, smooth-rolling 20" wheels, and child-specific components, it’s the perfect next step for young riders progressing from smaller bikes.

Unlike heavier steel-framed kids’ bikes, the ARX 20 uses Giant’s ALUXX-grade aluminium to keep weight low and handling responsive. The 20-inch wheels are paired with low-resistance tyres for easy rolling on pavement, park paths, and light trails. The 8-speed Shimano drivetrain introduces gear shifting, helping kids tackle hills and build cycling skills.

The short-reach brake levers, narrow Q-factor cranks, and light-action brakes are all sized for smaller hands and legs, helping young riders stay in control. The adjustable saddle height and low standover frame make it easy to grow with your child.

Available in four vibrant colourways—Phoenix Fire, Cobalt, Soap Suds, and Lime Punch—the ARX 20 combines performance with personality, making it a favourite for kids and parents alike.


Upgrade Alternatives

  • Giant ARX 24: For children aged 7–10 who are ready for a 24" wheel and more advanced riding.

Features

  • ALUXX-grade aluminium frame and fork
  • 20" wheels with low-resistance tyres
  • Shimano 8-speed drivetrain with twist shifter
  • Child-specific brake levers and cranks
  • Lightweight alloy components
  • Adjustable saddle height
  • Suitable for ages 5–8 (approx. height 120 - 140cm)
Technical Information
  • Frame
  • Sizes
    One Size
  • Colours
    Phoenix Fire, Cobalt, Soap Suds, Lime Punch
  • Frame
    ALUXX-grade aluminium
  • Forks and Shocks
  • Fork
    ALUXX-grade aluminium
  • Rear Shock
    N/A
  • eSystem
  • Motor
    N/A
  • Controller
    N/A
  • Display
    N/A
  • Battery Type
    N/A
  • Battery Integration
    N/A
  • Conectivity
    N/A
  • Charger
    N/A
  • Drivetrain and Brakes
  • Brake System
    Alloy, linear pull, junior MTB levers
  • Rear Derailleur
    Shimano Altus RD-M310
  • Front Derailleur
    N/A
  • Shifters
    Shimano Altus SL-M315 1x8
  • Bottom Bracket
  • Crankset
    Alloy, forged, three-piece, 32t, 115mm
  • Cassette
    Shimano HG200, 12x32
  • Chain
    KMC Z8
  • Cockpit
  • Handlebar
    Giant Youth, 480mm width, 31.8mm
  • Stem
    Ahead, alloy, 25.4x60mm
  • Grips
  • Headset
  • Wheels
  • Front Hub
    Alloy, 24 hole, quick release axles
  • Rear Hub
    Alloy, 24 hole, quick release axles
  • Rim
    Giant Kids 20", alloy technology
  • Front Tyre
    Innova IB-3010, 20x1.5"
  • Rear Tyre
    Innova IB-3010, 20x1.5"
  • Max Tyre Clearance
  • Finishing Kit
  • Seatpost
    Alloy, 27.2mm
  • Saddle
    Selle Royal Vivo Jr
  • Pedals
    Platform
  • Extras
  • Kickstand
    N/A
  • Lighting
    N/A
  • Lock
    N/A
  • Carrier
    N/A
  • Mudguards
    N/A
  • Extras
    Bell, rear derailleur guard, chain guide
  • Please Note:
    Every effort has been made to ensure accuracy throughout this website. However, manufacturers reserves the right to change bike specifications, features, prices and colours without prior notice. If you would like to check the specification of a bike before purchasing, please call one of our stores.
Sizing Information
Size Guide

Frame SizeRider height (cm)Rider height (feet)
One Size120 - 1403'9" - 4'6"

Frame Geometry


XS
ASeat Tube Length (mm)254
BSeat Tube Angle72.0°
CTop Tube Length (mm)450
DHead Tube Length (mm)120
EHead Tube Angle69.0°
FFork Rake (mm)38
GTrail (mm)53
HWheel Base (mm)886
IChain Stay Length (mm)375
JBottom Bracket Drop (mm)10
KStack (mm)403
LReach (mm)319
MStand Over Height (mm)509
NHandlebar Width (mm)480
OStem Length (mm)60
PCrank Length (mm)127
QWheel Size20"
Professional Opinion
  • ALUXX Aluminium Technology
    This Performance level frame material features 6061 alloy with single-butted tubes to produce strong, lightweight framesets for a variety of different bikes and riding styles.
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