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Bike Chain Lock520
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  • Bike Chain Lock520
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Bike Chain Lock520



Bike Chain Lock520

8 pcs sold
3 reviews
2 of 3 people recommends this product
  • Bike Chain Lock520
  • Bike Chain Lock520
  • Bike Chain Lock520
  • Bike Chain Lock520
  • Bike Chain Lock520
Bike Chain Lock520
Not available online

Store Availability

Our teams have developed this bike chain lock to secure your bike to different shaped attachment options.

a good length bike lock that lets you attach 2 bikes or your bike around large diameter fixed objects (e.g. trees, posts, railings...)


Theft resistant

Short stop-offs.
Security rating: 5/10.
Links with a cross-section of 6 mm


Usable length: 110cm.
Perfect for securing 2 bikes.


1000 g



Pick-proof lock.
Comes with 3 keys.


The security rating helps you choose the lock that is most suited to your needs.
For this reason, B'TWIN defined a test protocol with an independent laboratory, CNPP, based on real-life theft techniques.
This unique protocol allows each lock to be given a comparable rating from 0 to 10 indicating how theft resistant it is. (10 being fully theft-proof).



3.3/5 3 reviews
2 of 3 people recommends this product
Hefty, weather resistant, but not tough
Chew (Singapore) Used for 2 to 8 weeks
Lasted about 2 months of daily use before something internal sheared off.

No visible rusting under wet weather. I oiled it a bit from time to time, still smooth to insert key. Didnt pick up dirt. Good length, never had issue locking to posts/ bike racks.

The key doesn't come out until it's locked again which got ​annoying for me.
The sheathing uses hook and loop on the free end which came out easily, exposing the chain, scratching my bike before I sewed it shut.

Something internal sheared off and the lock no longer rotates.

It's likely still a good weather resistant lock, but maybe keep it on the bike rack.
Response of the brand

Hi Chew,

I'm really sorry to hear about your dissatisfactory experience with the Bike Lock 520. If you believe it to be defective, please feel free to reach out to our User Happiness Team in our Singapore Lab Store who will be pleased to assist and resolve your issue as soon as possible. Please chat with us directly here for a resolution!


Digital Sport Leader

Cycling & Roller Sports

Good quality
Michael (Singapore) Used for 2 to 8 weeks Verified purchase What is a review "Verified purchase" ?

Where review is marked as "Verified purchase" confirmed by Decathlon, this means that we could verify that the client who filed this opinion has purchased the product from us.

We can confirm purchases for the reviews expressed on a request by e-mail after purchase or when the customer has this review from his personal space.

If review is not marked as "Verified purchase", this does not mean that the author's review has no experience with the product may have given his review directly on the site without unique identification, or the product has been offered or paid.

The label "Verified purchase" lets help you judge the reliability of a review.
Recommended if you need to keep your expensive bike secured
Response of the brand

Hi Michael,

Thank you for taking the time to write a review on the Bike Chain Lock520. I am glad that this product has been working well for you and that you love it.

At Decathlon, our mission is to make sports accessible for the many. It is our responsibility to ensure that our products are made to satisfy our users. 

Feel free to write a review on other Decathlon products and I hope to see you in our store soon!

Sport on safely!


Omni-channel Sports Advisor

Decent lock, but too short, deceiving security.
Nathaniel (Singapore) Used for 3 to 6 months
The lock is good enough quality. There are two main issues, its too short to fit around many of the posts in Singapore and the lock chain while sturdy in itself is secured with a sheet metal tab inside the lock, would be fairly easy to pull the chain out of the latching mechanism with appropriate tools such as a car jack
Response of the brand

Hi Nathaniel,

Thank you for taking the time to review our products. I am sorry to hear about your less than satisfactory experience with the Bike Chain Lock 520.

We'll bring your feedback to our design team to see how we can improve the length of the lock as well as the security of the lock in our future designs.

Thank you and sport on safely! :)

Skate safe! Skate fast!

Guo siong

Bedok Oxelo Sports Leader

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