Sale now on! Save up to 50%.
Shop Sale
Sports
Sports
Women
Women
Men
Men
Kids
Kids
Accessories
Accessories
Nutrition and Body Care
Nutrition and Body Care
Maintain and Repair
Maintain and Repair
Sports Clothing
Sports Clothing
Deals
Deals
Brands
Brands
Sports
Cycling
Skiing
Snowboarding
Fitness & Gym
Football
Running
Hiking
Swimming
Winter Sports
Horse Riding
Country Sports
Camping
Mountain Biking
Road Cycling
Tennis
Roller Skating
Padel
Rugby
Golf
Yoga
Fishing
Kayaking
Stand Up Paddle
Trekking
Basketball
Scootering
Climbing
Trail Running
Mountaineering
Slacklines
Via Ferrata, Canyoning and Caving
Aqua Fitness
Water Polo
Surf
Sailing
Snorkelling
Scuba Diving
Spearfishing
Water Skiing and Wakeboarding
Kitesurfing and Windsurfing
Wing Foil
Kiting
Frisbee and Boomerangs
Cross-Training
HIIT Training
Bodybuilding
Boxing
Pilates
Gymnastics
Martial Arts
Kids PE & Gym
Dance
Gym Gear for Babies
Athletics
Triathlon
Orienteering
Nordic Walking
Power Walking
Cricket
Handball
Field Hockey
American Football
Baseball
Roller Hockey
Netball
Volleyball and Beach Volleyball
Badminton
Table Tennis
Squash
Frontenis
Beach Tennis
Basque Pelota
Ice Hockey
Ice & Figure Skating
Skateboarding and Longboarding
Archery
Darts
Snooker and Pool
Boules and Petanque
Skittles and Palet
Wallball
Carp Fishing
Predator fishing
Coarse & Match Fishing
Sea fishing
Teqball
Racketball
Race Walking
Floorball
Table Football
Bushcraft - Bivouac
Dodgeball
Pickleball
Disability Sports & Adaptive Clothing
Women
Clothing
Shoes
Activewear
Swimwear
Loungewear
Bikes
Athleisure
Plus Size Clothing
Bags and Accessories
Sales
New Winter Sports Collection
Wetsuits
Men
Clothing
Shoes
Bikes
Activewear
Swimwear
Bags and Accessories
Loungewear
Athleisure
Plus Size Clothing
Sales
Men's Rain Jackets
Wellies, Wellington boots, short wellies
Kids
Clothing
Shoes
Outdoor Activities
Bags and Accessories
Baby and Toddlers
Swimwear and Beachwear
Back To School
Sales
Football Gloves, Beanies and Snoods
Football Base Layers
Accessories
Sports Electronics
Bags
Footwear Accessories
Water Bottles, flasks and protein shakers
Sunglasses
Umbrellas
Navigational Equipment
Hats, Headwear and Gloves
Rain Poncho and Capes
Towel and Towel Ponchos
Backpacks
Activity Trackers
Nutrition and Body Care
Protein
Food and Snacks
Vitamins & Supplements
Hydration
Energy Supplements
Pre, Intra and Post-Workout
Protein Shakers & Water Bottles
Recovery and Injury
Skin and Body Care
Pre, Intra and Post-Workout
Vitamins & Supplements
Maintain and Repair
Fix it yourself
Repair with us
Maintain and Repair
Second Life Products
Sports Clothing
Thermals & Base Layers
Jackets
Waterproof Jackets
Gilets
Waterproof Trousers
Fleeces
Leggings
Socks
Shorts
Wetsuits
Deals
Up to 50% off
Mens Sale
Womens Sale
Kids Sale
Running Sale
Ski Sale
Fitness Sale
Cycling Sale
Hiking Sale
Swimming Sale
Camping Sale
Football Sale
Last Chance
Golf Sale
Sailing Sale
Water Sports Sale
Gym & Dance Sale
Horse Riding Sale
Fishing Sale
Snowboard Sale
Black Friday
Brands
QUECHUA
ROCKRIDER
DOMYOS
KIPRUN
KIPSTA
TRIBORD
ADIDAS
SALOMON
THULE
KIPRUN
GARMIN
PUMA
ASICS
CANTERBURY
CONTINENTAL
FORCLAZ
ITIWIT
KALENJI
NABAIJI
OLAIAN
REEBOK
ROXY
SIMOND
TAYLORMADE
TRIBAN
TARMAK
UMBRO
VAN RYSEL
WILSON
WEDZE
YONEX
Help & support
Find a store
Sports
Mountain Biking
Mountain Bikes
Kids Mountain Bikes
Kids' Mountain Bikes
Get the whole family adventuring with kids’ mountain bikes from Decathlon. Designed to provide shock absorption for growing bodies, our range includes girls' mountain bikes and boys' mountain bike models with different styles and frame sizes.
Womens Mountain Bikes
Mens Mountain Bikes
Electric Mountain Bikes
See more
Filters
29 items
Most relevant
wheel size
16"
1
20"
9
24"
9
26"
8
27.5"
1
bike frame material
steel frame
18
aluminium frame
7
suspension
stiff
3
semi stiff
20
number of chainrings
triple chainring
2
single chainring
15
number of speeds
1 speed
1
6 speeds
8
7 speeds
5
8 speeds
2
9 speeds
2
18 speeds
9
21 speeds
1
sizes
20"
9
24"
6
26"
5
M
3
2XS
2
3XS
2
S
2
XS
2
2XL
1
3XL
1
See all
colours
black
7
blue
6
green
5
orange
5
white
4
yellow
3
grey
2
purple
2
pink
1
red
1
price
Minimum
Maximum
Sellers
Decathlon
15
United Wheels UK Ltd
8
E-Bikes Direct
6
Sale
ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 500 - Orange
(644)
2 colours
£209.99
£219.99
£10 off
ROCKRIDER 24" 9-12 Years Mountain Bike Expl 500 - Black
(304)
2 colours
£249.99
Sale
ROCKRIDER 20" 6-9 Years Mountain Bike Expl 120 - White
(268)
£179.99
£189.99
£10 off
ROCKRIDER Kids' 24" 9-12 Years Mountain Bike ST 900 - Red
(317)
£349.99
Sale
ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 500 - Black
(644)
2 colours
£209.99
£219.99
£10 off
BASIS Basis Bolt Boys Hardtail Mountain Bike, 24In Wheel, 18 Speed - Lime Green
(1)
Sold and shipped by E-Bikes Direct
£229.99
BASIS Basis Vogue Junior Girls Full Suspension Mountain Bike 24in Wheel - Grey
Sold and shipped by E-Bikes Direct
£279.99
Sale
HUFFY Huffy Extent Kids Mountain Bike 20" Wheel 6-9 Years 6 Speed - Antifreeze Green
(1)
Sold and shipped by United Wheels UK Ltd
£208.99
£219.99
£11 off
£208.99/unit
BASIS Basis 1 Full Suspension Mountain Bike - 26in Wheel - 18 Speed Black Pink
(1)
Sold and shipped by E-Bikes Direct
£218.99
BASIS Basis Bolt Boys Hardtail Mountain Bike, 24In Wheel, 18 Speed - Grey/Orange
(1)
Sold and shipped by E-Bikes Direct
£229.99
Sale
HUFFY Huffy Extent Kids Mountain Bike 20" Wheel 6-9 Years 6 Speed - Aqua Blue
Sold and shipped by United Wheels UK Ltd
£202.39
£219.99
£17.60 off
£202.39/unit
Sale
HUFFY Huffy Extent 26 Inch Womens Hardtail Mountain Bike White and Purple 18 Speed
Sold and shipped by United Wheels UK Ltd
£229.99
£249.99
£20 off
£229.99/unit
Sale
HUFFY Huffy Extent Womens Mountain Bike 27.5" Wheels 18 Speed Gloss Purple + Black
(1)
Sold and shipped by United Wheels UK Ltd
£248.39
£269.99
£21.60 off
XN XN Revenge Boys Full Suspension Mountain Bike 16in Wheel - Black/Yellow/Red
Sold and shipped by E-Bikes Direct
£149.99
Sale
HUFFY Huffy Extent Adult Hardtail Mountain Bike 26 Inch 18 Speed Gunmetal Grey
(6)
Sold and shipped by United Wheels UK Ltd
£229.99
£249.99
£20 off
Sale
HUFFY Huffy Extent Kids Mountain Bike 24" Wheel 8-11 Years 18 Speed Cobalt Blue
(1)
Sold and shipped by United Wheels UK Ltd
£229.99
£249.99
£20 off
£229.99/unit
New
DALLINGRIDGE Dallingridge Viscount Mens Mountain Bike, 27.5in Wheel, 15in Frame - White/Red
Sold and shipped by E-Bikes Direct
£209.99
Second life
BTWIN Second Life - Kids' 20" 6-9 Years Mountain Bike Expl 500 - Orange - EXCELLENT
£213.00
Second life
ROCKRIDER Second Life - Kids' 20" 6-9 Years Mountain Bike Expl 500 - Black - GOOD
£179.99
Second life
ROCKRIDER Second Life - 20" 6-9 Years Mountain Bike Expl 120 - White - VERY GOOD
£179.99
New
ROCKRIDER Kids' Mountain Bike 24" 9-12 Years EXPL 900 - Blue
(2)
£399.99
Sale
HUFFY Huffy Korros MTB 26" Blue
(7)
Sold and shipped by United Wheels UK Ltd
£239.20
£260.00
£20.80 off
Sale
HUFFY Huffy Extent 24in Hardtail Mountain Bike - Midnight Purple
Sold and shipped by United Wheels UK Ltd
£229.99
£249.99
£20 off
£229.99/unit
ROCKRIDER Kids' Mountain Bike 26" 9-12 Years EXPL 900 - Yellow
(1)
£449.99
Out of stock
ROCKRIDER 26" Kids' 9-12 Years Mountain Bike ST 500 - Orange
(1778)
3 colours
£279.99
Out of stock
New lower price
ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 900R - Red
(63)
£329.99
Out of stock
ROCKRIDER Kids' 26" 9-12 Years Mountain Bike ST 500 - Blue
(1778)
3 colours
£279.99
Out of stock
ROCKRIDER Kids' 24" 9-12 Years MTB EXPL 500 - Yellow
(304)
2 colours
£249.99
Out of stock
ROCKRIDER Kids' 26" 9-12 Years Mountain Bike ST 500 - Khaki
(1778)
3 colours
£279.99
Out of stock