Mountain Bikes

Tackle trails, downhill challenges, and rugged terrain with Decathlon’s trail-ready mountain bikes. Our range includes options for adults and children, featuring premium models from Rockrider and Btwin. Pair your bike with our wide selection of mountain bike accessories for the ultimate off-road experience. Shop now and gear up for adventure.
137 items
New Lower Price
ROCKRIDER 27.5" Mountain Bike - EXPL 50 Dark Grey

ROCKRIDER 27.5" Mountain Bike - EXPL 50 Dark Grey

(2)
3 colours
£229.99
Was £249.99
ROCKRIDER Kids 9-12 years EXPL500 26" - Khaki

ROCKRIDER Kids 9-12 years EXPL500 26" - Khaki

(1806)
4 colours
£249.99
£279.99£30 off
ROCKRIDER Kids' 9-12 years 26" EXPL 500 MTB - Orange

ROCKRIDER Kids' 9-12 years 26" EXPL 500 MTB - Orange

(1806)
4 colours
£249.99
£279.99£30 off
ROCKRIDER 24" 9-12 Years Mountain Bike Expl 500 - Black

ROCKRIDER 24" 9-12 Years Mountain Bike Expl 500 - Black

(368)
2 colours
£249.99
ROCKRIDER Kids' 9-12 years 26" EXPL 500 MTB - Purple

ROCKRIDER Kids' 9-12 years 26" EXPL 500 MTB - Purple

(1806)
4 colours
£249.99
£279.99£30 off
Online only
HUFFY Huffy Marker Full Suspension MTB Bike 21spd Black 26"

HUFFY Huffy Marker Full Suspension MTB Bike 21spd Black 26"

(6)
Sold and shipped by United Wheels UK Ltd
£212.50
£250.00£37.50 off
ROCKRIDER 27.5" Mountain Bike - EXPL 50 Red

ROCKRIDER 27.5" Mountain Bike - EXPL 50 Red

(2)
3 colours
£229.99
ROCKRIDER 27.5"+ Electric Hardtail MTB Bike E-ST 900 - Grey

ROCKRIDER 27.5"+ Electric Hardtail MTB Bike E-ST 900 - Grey

(653)
£1,599.99
£1,999.99£400 off
ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 500 - Orange

ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 500 - Orange

(723)
2 colours
£219.99
ROCKRIDER 29" Full Suspension Electric Mountain Bike E-EXPL 500 S - Metal Grey

ROCKRIDER 29" Full Suspension Electric Mountain Bike E-EXPL 500 S - Metal Grey

(171)
£2,199.00
£2,499.99£300.99 off
ROCKRIDER Kids' 24" 9-12 Years Mountain Bike ST 900 - Red

ROCKRIDER Kids' 24" 9-12 Years Mountain Bike ST 900 - Red

(289)
£349.99
ROCKRIDER Kids' Mountain Bike White - 20" MTB Expl 120

ROCKRIDER Kids' Mountain Bike White - 20" MTB Expl 120

(313)
£179.99
Online only
HUFFY Huffy Extent Kids Mountain Bike 20" Wheel 6-9 Years 6 Speed - Antifreeze Green

HUFFY Huffy Extent Kids Mountain Bike 20" Wheel 6-9 Years 6 Speed - Antifreeze Green

(1)
Sold and shipped by United Wheels UK Ltd
£186.99
£219.99£33 off
ROCKRIDER Kids' 24" 9-12 Years MTB EXPL 500 - Yellow

ROCKRIDER Kids' 24" 9-12 Years MTB EXPL 500 - Yellow

(368)
2 colours
£249.99
ROCKRIDER 27.5" Touring Mountain Bike ST 120 - Grey/Orange

ROCKRIDER 27.5" Touring Mountain Bike ST 120 - Grey/Orange

(3328)
2 colours
£349.99
Online only
HUFFY Huffy Korros MTB 26" Blue

HUFFY Huffy Korros MTB 26" Blue

(9)
Sold and shipped by United Wheels UK Ltd
£221.00
£260.00£39 off
Online only
HUFFY Huffy Extent Kids Mountain Bike 20" Wheel 6-9 Years 6 Speed - Aqua Blue

HUFFY Huffy Extent Kids Mountain Bike 20" Wheel 6-9 Years 6 Speed - Aqua Blue

Sold and shipped by United Wheels UK Ltd
£186.99
£219.99£33 off
ROCKRIDER 27.5" Touring Mountain Bike ST 120 - Black/Blue

ROCKRIDER 27.5" Touring Mountain Bike ST 120 - Black/Blue

(3328)
2 colours
£349.99
ROCKRIDER Kids' Mountain Bike 24" 9-12 Years EXPL 900 - Blue

ROCKRIDER Kids' Mountain Bike 24" 9-12 Years EXPL 900 - Blue

(9)
£399.99
ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 500 - Black

ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 500 - Black

(723)
2 colours
£219.99
New Lower Price
ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 900R - Red

ROCKRIDER Kids' 20" 6-9 Years Mountain Bike Expl 900R - Red

(82)
£329.99
Was £349.99
ROCKRIDER 27.5" Hardtail Electric Mountain Bike E-ST 100 - White/Red

ROCKRIDER 27.5" Hardtail Electric Mountain Bike E-ST 100 - White/Red

(343)
£999.99
£1,099.99£100 off
ROCKRIDER 29" Hardtail Electric Mountain Bike E-EXPL 520 - Midnight Blue

ROCKRIDER 29" Hardtail Electric Mountain Bike E-EXPL 520 - Midnight Blue

(200)
2 colours
£1,899.99
Online only
BASIS Basis El Toro Men's Hardtail Mountain Bike, 27.5In Wheel, 15in Frame - White/Red

BASIS Basis El Toro Men's Hardtail Mountain Bike, 27.5In Wheel, 15in Frame - White/Red

2 colours
Sold and shipped by E-Bikes Direct
From £199.99
Online only
BASIS Basis Beacon Hardtail Electric Mountain bike, 8.8Ah - Black/Red

BASIS Basis Beacon Hardtail Electric Mountain bike, 8.8Ah - Black/Red

(1)
Sold and shipped by E-Bikes Direct
£849.00
Last chance
ROCKRIDER 27.5" Electric Mountain Bike E-ST 500 - Black

ROCKRIDER 27.5" Electric Mountain Bike E-ST 500 - Black

(35)
£1,399.00
£1,599.99£200.99 off
Online only
HUFFY Huffy Extent 26 Inch Womens Hardtail Mountain Bike White and Purple 18 Speed

HUFFY Huffy Extent 26 Inch Womens Hardtail Mountain Bike White and Purple 18 Speed

Sold and shipped by United Wheels UK Ltd
£212.49
£249.99£37.50 off
ROCKRIDER 29" Hardtail Electric Mountain Bike E-Expl 700 - Bottle Green

ROCKRIDER 29" Hardtail Electric Mountain Bike E-Expl 700 - Bottle Green

(276)
£2,199.99
£2,499.99£300 off
ROCKRIDER 29 inch Touring Mountain Bike Explore 540 - Plum / Black

ROCKRIDER 29 inch Touring Mountain Bike Explore 540 - Plum / Black

£599.99
£749.99£150 off
Online only
EASTERN BIKES Eastern Alpaka 29 MTB Hardtail Bike - Black

EASTERN BIKES Eastern Alpaka 29 MTB Hardtail Bike - Black

(3)
5 colours
Sold and shipped by Premium Cycle Brands
£599.99
Last chance
ROCKRIDER Women's 27.5" Mountain Bike ST 120 - Navy

ROCKRIDER Women's 27.5" Mountain Bike ST 120 - Navy

(546)
£329.99
£349.99£20 off
Online only
HUFFY Huffy Korros 27.5" Mountain Bike Hardtail Front Suspension Shimano 21 Spd MTB

HUFFY Huffy Korros 27.5" Mountain Bike Hardtail Front Suspension Shimano 21 Spd MTB

(4)
Sold and shipped by United Wheels UK Ltd
£254.15
£299.00£44.85 off
Online only
DALLINGRIDGE Dallingridge Viscount Hardtail Mountain Bike, 27.5in Wheel, 17in Frame - Grey

DALLINGRIDGE Dallingridge Viscount Hardtail Mountain Bike, 27.5in Wheel, 17in Frame - Grey

Sold and shipped by E-Bikes Direct
From £219.99
Online only
HUFFY Huffy Extent Mens Mountain Bike 27.5" Wheels 18 Speed Black + Red

HUFFY Huffy Extent Mens Mountain Bike 27.5" Wheels 18 Speed Black + Red

(6)
Sold and shipped by United Wheels UK Ltd
£229.49
£269.99£40.50 off
ROCKRIDER 27.5" Mountain Bike ST 900 S - Grey/Yellow

ROCKRIDER 27.5" Mountain Bike ST 900 S - Grey/Yellow

(284)
£799.99
£899.99£100 off
Online only
DALLINGRIDGE Dallingridge Crossbow Jr. Full Suspension Mountain Bike, 24In Wheel - Grey/Blue

DALLINGRIDGE Dallingridge Crossbow Jr. Full Suspension Mountain Bike, 24In Wheel - Grey/Blue

Sold and shipped by E-Bikes Direct
£239.99
Online only
BASIS Basis Vogue Junior Girls Full Suspension Mountain Bike 24in Wheel - Grey

BASIS Basis Vogue Junior Girls Full Suspension Mountain Bike 24in Wheel - Grey

Sold and shipped by E-Bikes Direct
£239.99
Online only
EASTERN BIKES Eastern Alpaka 29 MTB Hardtail Bike - Yellow

EASTERN BIKES Eastern Alpaka 29 MTB Hardtail Bike - Yellow

(3)
5 colours
Sold and shipped by Premium Cycle Brands
£599.99
Online only
XN XN Revenge Boys Full Suspension Mountain Bike 16in Wheel - Black/Yellow/Red

XN XN Revenge Boys Full Suspension Mountain Bike 16in Wheel - Black/Yellow/Red

Sold and shipped by E-Bikes Direct
£149.99
ROCKRIDER Women's 27.5" Electric Mountain Bike E-ST 500

ROCKRIDER Women's 27.5" Electric Mountain Bike E-ST 500

(1)
£1,299.99
£1,599.99£300 off
4.2/5 based on 25543 reviews collected online and in stores

Mountain Bikes for Challenging Terrains

Engineered for rugged, off-road landscapes, a mountain bike is built for durability and impact. Perfect for tackling downhills, forest trails, single tracks and unpaved paths, our MTBs are equipped with premium tyres designed for grip and traction in tough conditions. Choose the best tyre type for your terrain and experience smoother, safer rides. Whether you’re looking for a versatile hardtail mountain bike or a speedy downhill model, our MTB bikes are designed to conquer any challenge.

Full Suspension Mountain Bikes & E-Mountain Bikes

Experience smoother rides with our full-suspension mountain bikes, ideal for rugged trails and uneven paths. Featuring brands like Barracuda, Freespirit, Basis and Lombardo, our range includes options for men, women, and kids— each model designed to meet the demands of rugged trails and ensure a comfortable ride. Need extra power on the trails? Our e-mountain bikes are a great choice for those seeking long rides with less fatigue.

Mountain Bike Accessories

Complete your setup with our selection of mountain bike accessories. From mountain bike helmets to mountain bike shorts, Decathlon has everything you need to get out on UK trails with confidence. If you prefer to concrete comfort of roads, see our collection of road bikes.