Chains are a very secure way to keep your bike locked up safely. Bike chain locks are usually heavier than a cable or D-Lock, but this is because they are built from tough chain links that will resist strong attacks. This makes them an ideal way to protect your bike in your house or garage – use with a ground anchor for maximum effect.
Remember, chain locks are only strong as its padlock, so make sure you choose a chain padlock to suit the size and strength of the rest of the chain. The best locks are Sold Secure rated. Sold Secure is an independent rating system and approved locks are graded Gold, Silver or Bronze depending on how long it takes to break.