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Cycling Chain Lock Bike 700,black, photo 1 of 6

Cycling Chain Lock Bike 700,black, photo 2 of 6

Cycling Chain Lock Bike 700,black, photo 3 of 6

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Decathlon Btwin
492 Reviews

Cycling Chain Lock Bike 700

Regular price: $39.99 Regular price:

Cycling Chain Lock Bike 700,black, photo 1 of 6

Cycling Chain Lock Bike 700,black, photo 2 of 6

Cycling Chain Lock Bike 700,black, photo 3 of 6

Cycling Chain Lock Bike 700,black, photo 4 of 6

Cycling Chain Lock Bike 700,black, photo 5 of 6

Cycling Chain Lock Bike 700,black, photo 6 of 6
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Regular price: $39.99 Regular price:

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San Francisco, 735 Market St. Options

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Model: 8168162

Product Features

A photo of the Cycling Chain Lock Bike 700 in use

Cycling Chain Lock Bike 700 is designed for protecting your bike during long stops.

Highly resistant, high-security bike lock. Perfect for securing the frame and front wheel.


Security level rating: 8 out of 10. High-security lock


Usable length: 35.4". Ideal for securing frame and wheel to a fixed object.


Weight: 5.1 lbs.

Product Customer Reviews

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492 Reviews
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Cycling Chain Lock Bike 700,black
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Terrible product

After only two weeks of using this product the lock started getting stuck, making it more difficult to open. At some point I would have to spend 10 minutes on wrestling with the key and the lock trying to open it.

It is possible that some grit or dirt may have entered the locking mechanism. If you feel the item is faulty, please feel free to return the item to us for a refund or an exchange.
Peter, Cycling Manager, DECATHLON
doesn't work every time.

Since i bought it it was not good. The lock stuck must oftime and i have to keep wiggle it to make it work. last week the lock doesn't want to open. luckily i couldn't lock my bike so the bike stayed in the bike shelter but now i am unable to unlock and bring it for refund. lost the lock and no refund:)

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Thank you for posting a review of your lock. I'm sorry to read that the lock isn't working as well as it should after 12 months of use. It is possible that some grit may have entered the mechanism causing is to seize. Take a photo of your lock and take it to your nearest shop (drop them a line first) where they can discuss the best option for you.
Peter, Cycling Manager, DECATHLON
Nice lock, can I get additonal keys?

Hi, I have used the lock for a few months now, works great. I've lost one of the keys so I now have only 1 left. Is it possible to get a replacement set of keys to match the lock? I'm worried about losing this one and not being able to get the lock off. Bike locks typically come with 3 keys, It says in the description that the keys are numbered but htis doesn't appear to be the case, can you confirm this please? Thanks, Adam.

Bike locked forever

Impossible to unlock my bike... must be an indoor lock as it rusted really quickly. Bike being chained for weeks now. Tryied all sorts of oil impossible to open it.... if anyone at decathlon reads this and has a solutioon i d appreciate.

Dear sir,
I can confirm that this is a lock designed for outdoor use. I have used the very same one personally for nearly three years outside. Every few months I apply some spray grease in the lock (not WD40 etc...) but one of the most common causes of locks jamming up is grit and grime. Keeping the lock mechanism off the ground for as long as possible is a good tip.
Realistically in your case, the only way will be to saw or cut through the chain with a very large bolt cuter or axle grinding machine as this lock is very strong.
Peter Lazarus, National Cycling Manager, DECATHLON
Not enough to stop theft

I had great faith in this lock, but have just had my bike stolen with this securing it. It appears a bolt cutter can cut through the metal links.

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I'm very sorry to read that a thief stole your bike. It is terrible that this has happened and from my unfortunate personal experience, I empathise completely. This strong chain lock deters many would be thieves, particularly ones of the opportunistic variety. However it is also true to say that some professional thieves carry large bolt cutters and other equipment and given enough time can break through most bike locks. The hardened steel on the links is graded at 65 HRC meaning it is very strong indeed which would have slowed down the thieves considerably.
Peter Lazarus, National Cycling Manager, DECATHLON
chain very good, padlock not great

Nice heavy chain, but the padlock is very tempremental. Two or three times now its jammed so that you cant unlock it, the last time it took three of us over an hour to unlock the thing. Will take it back to swap for something else.

I'm sorry to read that the padlock is jamming. Have you tried squirting some grease/oil into the two holes for the U shaped shackle? Try to avoid WD40 which can be OK for un-jamming or to displace water but is also degreaser (which is is not always desirable).
If you leave your lock out in the rain then this is good practice. If however, you keep your lock indoors or under a shelter then there may well be an issue, in which case, please return it to us for an exchange.
Peter Lazarus UK Cycling Market Manager DECATHLON
Good but very very heavy

Its a solid lock but can anybody suggest that when I am travelling can I fasten this lock to any part of the cycle so that i dont have to carry it in my bag ??


Get it if you want to be worry free of your bike

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Very strong looking lock, but NOT unbreakable

Had this lock for about 18 months, I used it to secure three bikes together in the shed. Thought it would be strong enough to withstand attack, unfortunately not. Had two bikes stolen from shed, the third was left on the lawn, obviously not good enough for them, although it did cost £300! The forensic officer said that bolt cutters had been used on the chain, not the lock. He was surprised and would be upgrading his own motorbike chain at it was smaller than this one. I'll be looking for something more secure, when bikes are replaced.

Spare Keys

Where can I get spare keys from, I have the key number? Could you please put this information on your web site

Unfortunately, we don't offer a key replacement service on our bike locks.  If you lose you keys, you will need to purchase a new lock.
If you contact me directly, I can help find a solution for you.
Peter Lazarus UK Cycling Market Manager DECATHLON
A very good lock for £20

A good lock if you are concerned about locking your bike up in public.

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Ok Lock, but no Sold Secure Rating

Seems a decent enough lock, but it doesn't have a Sold Secure Rating, so you can't really use it as your main bike lock, only as a backup/secondary lock.

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This is indeed a very solid lock but it has not been sent off for testing with "sold secure".  It depends which insurance  company you use as not all require a sold secure rated lock (bronze, sliver,gold).
We do stock various rated locks from ABUS which may fulfill your requirements:
Silver: or
Peter Lazarus UK Cycling Market Manager DECATHLON
Excellent product and £30 cheaper than halfords

Excellent product and £30 cheaper than halfords

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Ras. Je recommande vivement....

Ras. Je recommande vivement. Très bonne chaîne et très bon cadenas.

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Le tissu qui entoure...

Le tissu qui entoure la chaîne se défait déjà après seulement 3 mois d'utilisation.

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Additional Product Information



  • 100% Acrylonitrile butadiene styrene


Contrary to what many people may think, no lock is fully tamper-proof. A bicycle lock is used to make stealing the bike more complicated and delay the thief; the lock thereby acts as a deterrent. A good lock has an anti-picking lock mechanism, and is made out of materials requiring the use of specific tools. These factors make theft more difficult.

Security rating

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

Main section

Links made of hardened steel (65 HRC), one of the highest strength levels available for bike locks. Guaranteed resistance to hacksaws and hammers. Covered in fabric to keep it from scratching the bike frame.


Reinforced lock mechanism. Hundreds of different keys to limit the risk of theft. Comes with 2 numbered keys.




Size Guide Visual