Go to search
Go to content
Go to footer

1-year returnsFor Decathlon-made products
Home Delivery Check our delivery rates & deadlines
Gift CardsGive the give of sport with an E-Gift Card to use in store or online at Decathlon.ie
2 Years Guarantee2 years guarantee for all Decathlon products.

Download the App
Become a member

Services

Play Store
Workshop
Buy Back
Cycle To Work
Business and Schools
Tent Pledge
Gift Card

Customer Care

Delivery Information
About Us
365 Days Return
2 Years Guarantee
Size Guide
Product Recall
FAQ
Report Illegal Content
Technical Support

Decathlon

Stores
Decathlon App
Marketplace Program
Sustainability
Affiliate Program
Careers

Marketplace payment providerTerms of Use

Terms And Conditions Of Sale Secure Payment General Terms of Use Legal Mentions Report a Vulnerability Gender Gap Pay Report 2024 Gender Gap Pay Report 2025 Privacy Policy Marketplace Legal Notice Cookie Policy

©2026 Decathlon

🚚 Selected Free Delivery for Orders Over €200 📦 Delivery Information

Marathon Prep: Buy Any 2 Accessories or Nutrition Essentials. Get 15% Off at Checkout

Decathlon Douglas Cork Opening October 16th Visit us!

Back to Commute
Global Brands
New Lower Prices

Cycling Fitness & Gym Equipment Hiking & Trekking Running Skiing & Snowboarding Camping & Bivouac Swimming Padel Yoga Pilates Golf Boxing

Women's Clothes Women's Shoes Women's Accessories Women's Sportswear Women's Activewear Womens sportswear Sales Women's Outdoor Collections

Men's Clothes Men's Shoes Men's Accessories Men's Sportswear Activewear Collections

Kid's Shoes Baby & Toddlers Kids Accessories Outdoor Play Equipment Kid's Clothing

Kids Waterproof Clothing

Kids Winter Clothing

Selections/Highlights

Kids Sportswear Sales

Sports Accessories

Electronic & Hightech Bags & Luggage Sport sunglasses & binoculars Cups, Trophies & Medals Bike Carriers & Bike Transport Bike Racks Bath towels Bottles & Hydration Other Accessories Lighting Umbrellas

Nutrition & Health

Sports Nutrition Healthy Food Brands Relaxation & Recovery Care & Hygiene Sun Protection and Accessories

Waterproof New Lower Prices School Holidays Lowest Price Best Value Picnic Essentials Back To School Collection Back to Sports Build Your Gym Cold Snap Wetsuits Black Friday Deals Base Layers

Repair & Maintenance

Maintenance Workshop Services After Sales Support

Back to Commute

New Lower Prices

Sports
Cycling
Bikes
Mountain Bikes
27.5" Mountain Bikes
27.5 Inch Mountain bike Rockrider ST 520 - Black
Spare Parts

Compatible spare parts

Keep enjoying your 27.5 Inch Mountain bike Rockrider ST 520 - Black with our selection of compatible spare parts.

bike drivetrain spare parts
bike direction spare parts
brakes spare parts
saddle spare parts
Cable
wheels spare parts
tires
bike accessories
attachment hanging and fixing
screw
tyres spare parts
bike frame spare parts

DECATHLON Cable Activated Disc Brake Kit
Reviews.votesAria
Current price {{currentPrice}} €36.00
ROCKRIDER Flat Resin Mountain Bike Pedals 700
Reviews.votesAria
Current price {{currentPrice}} €32.00€16.00/unit
ROCKRIDER Mountain Bike Clipless Pedals 520 - black
Reviews.votesAria
Current price {{currentPrice}} €26.00
ROCKRIDER 8-Speed 42/34/24 170 mm Square Axle Mountain Bike Chainset
Reviews.votesAria
Current price {{currentPrice}} €26.00
ROCKRIDER 31.8 / 760 mm Aluminium MTB Handlebar 8 mm Rise 9° Backsweep 4° Upsweep - Black
Reviews.votesAria
Current price {{currentPrice}} €26.00
Last chance Last chance
ROCKRIDER Saddle Mountain Bike Sport 900 - Grey
Reviews.votesAria
Current price {{currentPrice}} €25.00
DECATHLON Adjustable Aheadset Oversize Stem
Reviews.votesAria
Current price {{currentPrice}} €21.00
ROCKRIDER Raised Oversize 31.8 mm x 720 mm Handlebar
Reviews.votesAria
Current price {{currentPrice}} €21.00
DECATHLON 60° MD MTB / TREKKING / BIKE SADDLE
Reviews.votesAria
Current price {{currentPrice}} €21.00
ELOPS Rear Derailleur RD-M46-L 8/9 Speed
Reviews.votesAria
Current price {{currentPrice}} €21.00
ROCKRIDER 27.2 mm 350/400/450 mm Aluminium Seat Post with Clamp - Black
Reviews.votesAria
Current price {{currentPrice}} €21.00
ROCKRIDER 8-Speed 11x32 Cassette H801
Reviews.votesAria
Current price {{currentPrice}} €21.00
ROCKRIDER 8-Speed 118-Link Reinforced Bike Chain KMC E8 (Suitable for E-Bikes)
Reviews.votesAria
Current price {{currentPrice}} €21.00
ROCKRIDER All-condition MTB tyre 27.5 x 2.20 rigid bead
Reviews.votesAria
Current price {{currentPrice}} €20.00
BTWIN 8 to 9 Speed Rear Derailleur
Reviews.votesAria
Current price {{currentPrice}} €20.00
DECATHLON 8-SPEED 11X34 CASSETTE FOR CITY, MOUNTAIN AND ROAD BIKES
Reviews.votesAria
Current price {{currentPrice}} €19.00
DECATHLON 12X32 8-Speed Cassette
Reviews.votesAria
Current price {{currentPrice}} €16.00
ROCKRIDER Flat MTB bicycle pedals 520 grip black
Reviews.votesAria
Current price {{currentPrice}} €16.00€8.00/unit
Promotion Promotion
ROCKRIDER Mechanical Brake Kit MX 5 + Disc 160 mm
Reviews.votesAria
Current price {{currentPrice}} €16.00 Former price €26.00 38% off
Lowest price: €26.00
Starting on 20/9/2026 and valid for the entire duration of the promo
ROCKRIDER 1-1/8" 60/80/90/100 7° 31.8 Mountain Bike Stem - Black
Reviews.votesAria
Current price {{currentPrice}} €16.00

1 of 4

Page 1 of 4