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Eurocycles Guide to Bicycle Locks

Different types of bike locks and how to choose the best one for your needs.

When looking to protect your bike from theft, investing in the right bicycle lock is crucial. With the variety of options available, choosing the best one can be daunting. But fear not; our lock guide will walk you through the key factors to consider when selecting the perfect bicycle lock to keep your ride safe and secure.

Types of Bicycle Locks


U-locks are known for their robust construction and durability, making them popular among cyclists. These locks consist of a hardened steel shackle that forms a U shape, providing excellent resistance against cutting and leverage attacks. These are also known as D-Locks. 

Chain Locks

Chain Lock - Eurocycles Bike Lock guide

Chain locks offer flexibility in securing your bike to various structures. They are built with a durable chain encased in a protective sleeve, making them resistant to cutting and sawing. Chain locks are ideal for high-risk areas where theft is prevalent and perfect combined with U-Locks.

Cable Locks

Cable locks are lightweight and flexible, making them convenient to carry around. However, they are more susceptible to cutting than U-locks and chain locks. Cable locks are best suited for low to moderate-risk areas. They are a good secondary lock to use in combination with another type of lock for extra security. 

Folding Locks

Folding locks combine the security of U-locks with the flexibility of chain locks. These locks feature articulated steel bars that fold into a compact unit for easy portability. Folding locks provide a good balance between security and convenience.

What to look for when purchasing a lock for your bike?

Security Level

When choosing a bicycle lock, opt for a lock with a high-security rating to deter potential thieves. Look for locks that are resistant to cutting, drilling, and picking to ensure maximum protection for your bike.
Leading security brands, like Abus, use Sold Secure recognised standards to showcase the level of protection offered by their locks. Sold Secure is an independent security product certification agency working worldwide to test and assess the performance of security products. 

There are four Sold Secure levels:

- Diamond: highest security level available (rarely used for bike locks)
- Gold: Top-level for bicycle locks - ideal for high-risk environment
- Silver: great level of resistance against theft - good for higher-risk environment
- Bronze: Good to protect against opportunistic theft

Abus also uses their own Security Level, with a highest score of 15. 
Newer bike locks are fitted with alarms that link to your smartphone.

Security Levels for bike lock - Eurocycles Ireland

Size and Weight

Consider the size and weight of the lock, as it will impact your convenience and ease of use. A bulky and heavy lock may be secure but cumbersome, especially on long rides.

Locking Mechanism

Choose a lock with a reliable locking mechanism that is easy to operate yet robust against tampering. Look for locks with key or combination mechanisms based on your preference.


Higher-priced locks offer better security features and durability. At Eurocycles, we recommend you spend at least 15% of the price of your bike on your locking system and combine two different types of locks together to deter thieves. 

To select the best bicycle lock, you should always consider the lock type, security level, size, weight, locking mechanism, and price. 
By evaluating these factors and your specific riding habits, you can choose a bicycle lock that provides optimal security and peace of mind. Remember, investing in a high-quality lock is an investment in protecting your beloved bike from theft.