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Bike Chain Lock 520

Sale price: $29.99 Regular price:
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Sale price: $29.99 Regular price:

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San Francisco, 735 Market St. Options

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Model: 8399572

Product Videos

Product Features

A photo of the Bike Chain Lock 520 in use

Bike Chain Lock 520 is designed for securing your bike during short stops (around 30 minutes).

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


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


Usable length: 43.3". Perfect for securing 2 bikes.


2.2 lbs

Product Customer Reviews

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274 Reviews
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Bike Chain Lock 520,dark grey
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Lock rust when expose to rain

Bought for less than 3 months. The internal lock would rust and get damaged when expose to the rain. If you are parking your bike in the rain. You can be sure it will get damaged in less than 3 months. Use plastic bag to cover the lock to prevent water. Bike was almost locked for good due to damaged.

Hello Allan,

Thank you for taking the time to review the Bike Chain Lock 520. We regret to hear that the locking mechanism has corroded. We strive to provide Quality products at Affordable prices for our users.

We encourage our users to park their bikes in sheltered areas. The metal components in a lock is susceptible to corrosion due to the nature of the weather in an Island Nation such as Singapore. Similar to bicycles, after water ingress, the product needs to be dry and layered with a coat of lubricant so that corrosion does not occur. This in turn would ensure the longevity of the product.

Once again, thank you for your purchase and we apologise for any inconveniences that this has caused.


Feel More Secured

Adds security when parking your bicycle indoor and outdoor. Clean design and quality materials used. Keys are tough, too!

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A relatively solid & secure lock

Advantage: It is quite value for money with this price tag (S$25); its somehow solid material may deter someone from trying to steal your bicycle; long enough to secure your bicycle around a fixed object. Disadvantage: a bit heavy and the weight is about 1.3 kg, not less than 1 kg as advertised; no protective cover on the keyhole to prevent dust or water from entering into it. Something not tested: the security rating of this lock is 5/10 as advertised, however it has yet to be proven how long it takes to have this lock being cut in real life situation by using normal saw, bolt cuter or portable powered saw.

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Hi Kim Hock,

Thank you for purchasing our Bike chain Lock 520.
Yes, this lock does not have the same weather protection as some of our more expensive locks. However it is a pick proof lock designed for short stops and has a 5/10 rating from independent lab CNNP.

This video from our company explains how our locks are tested and rated by independent lab CNNP. 

Cycling Department Joo Koon
Brilliant lock

This lock is brilliant, it's long enough to go around the frame and wheels, and is very reliable/strong.

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This lock actually weighs 1,4kg, quite a lot more than stated. Ce cadenas pèse en fait 1,4kg, beaucoup plus que ce qui est indiqué.

Muy útil

Me resulta útil, por que cuando quiero amarrar mi bici no se em dificulta tanto gracias a su longitud. Aunque no estaría mal que tuviera un poco más de grosor para aumentar su nivel de seguridad

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Muy buena calidad

Es un candado con poco peso y mucha seguridad, adecuado para llevar en loa bicicleta.

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Seguridad básica

Candado de seguridad básica. Trae tres llaves y está forrado en tela impermeable.

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De momento perfecto

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Se ve muy seguro

Muy largo para podercatar hasta dos bicis

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Candado pésimo

1 año me ha durado, ya no abre, con la primera lluvia fuerte ya empezó a dar problemas, con la segunda ya no abre. decepcionante.

Hola .
Sentimos mucho los problemas ocasionados con nuestro producto , si no satisfecho puedes pasar por una de nuestras tiendas decathlon y hacer un cambio o devolución del mismo , puede que sea un fallo puntal del mismo .
Gracias por tu comentario , atentamente para cualquier otra consulta .
Saludos, Ruben , Monitor Pais de ciclismo ,

Aunque es un pelín aparatoso, es fuerte y cumple con las necesidades.

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Buen candado.

Buen candado con adecuado equilibrio entre seguridad, peso y tamaño. Soy más de candados en U pero este cumple.

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Additional Product Information



  • 100% Polyester cationic


  • 100% Polypropylene


  • 100% Steel


Pick-proof lock. Comes with 3 keys.

Security score

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



Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual