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Kryptonite Kryptolok Standard Bicycle U-Lock w/4-foot Flex Cable

Kryptonite Kryptolok Standard Bicycle U-Lock w/4-foot Flex Cable - Image 2

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Kryptonite Kryptolok Standard Bicycle U-Lock w/4-foot Flex Cable

£40.83

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Customers say

Customers find this bike lock to be of good quality, sturdy, and easy to use, working well for up to 6 months with no problems. They consider it good value for money, with one customer noting the £800 theft guarantee. The weight receives mixed feedback – while some find it not too heavy, others consider it a disadvantage. Customers report difficulties with the lock mechanism, finding it very hard to lock and unlock.

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959 customers mention quality, 892 positive, 67 negative

Customers praise the bike lock's quality, describing it as solid and extremely reliable, with one customer noting its effectiveness in high-crime areas.

Great lock but l ordered it for my daughter who forgot to mention she wanted the smaller one and it is too heavy for me to pay to return it, message…Read more

It's a good lock, BUT it takes ages to open it, because the key does not enter normally, u have to turn it a bit right and left…so sometimes it…Read more

This is perfect lock for money good quality and strong and also includes security cable aswel as lock mounting bracket very effective and easy to…Read more

Great product! If I had the opportunity, I would buy it again, for sure. Good buy and good seller, the whole process was OK. Recommendable!…Read more

556 customers mention security, 411 positive, 145 negative

Customers find the bike lock secure, keeping their bikes safe, with one customer noting it can lock up a full-size bike.

Very good and secure, but a little fiddly to lock and unlock, because the horizontal element easily falls away from the looped element once the key…Read more

I have had this lock for about a month and although it is very secure it can be tedious for me sometimes trying to unlock or lock it….Read more

…The key gets stuck and the even if I twist the key the lock remains 'locked'….Read more

I'm of mixed opinion of this lock. I think it's safe compared to some of the locks I've seen around but it does have a few annoyances:…Read more

493 customers mention strength, 467 positive, 26 negative

Customers appreciate the bike lock's strength, noting its sturdy construction and substantial feel.

Very sturdy very long cable, compact ebough to ride with, my only fault is that it is supplied with only 2 keys which is a bit of a let down, for me…Read more

A strong sturdy looking lock and key, comes with a strong flex cable. Perfect for what i need. I am impressed with the quality for the price i paid….Read more

…That said, I'm happy with the quality of this sturdy lock and for the price, it gives me the security I need to park my bike around Central London.Read more

As other have said, this is a great, solid and not too heavy lock with a nice solid cable, but the mounting bracket is, at least as intended to be…Read more

334 customers mention value for money, 314 positive, 20 negative

Customers find the bike lock to be good value for money, with one customer noting that both the D-lock and cable are strong for the price, and another mentioning the £800 guarantee against theft included.

seems a sturdy lock, at a good price with the added cable for additional security. Difficult to rate an item that's function is prevention….Read more

Good value, for this price is and excellent choice. The flex cable might be a little short, at least for me….Read more

Great value if you need the included cable. The total weight is a lot for everyday use and the cable is awkward to carry….Read more

Great lock! Great price! (mine came with a sticker on it that said 40 pounds) End of story. Keep your bike safe from those yobbos!Read more

318 customers mention functionality, 223 positive, 95 negative

Customers report that the bike lock works well, with some mentioning it has performed reliably for up to 6 months without issues.

Does the job; haven't had any complaints to be fair, still haven't come around getting it registered though, not sure how imperatiive this is, since…Read more

…Sure enough it fully deserved these reviews, as it is a very strong, reliable and seemingly durable (I've only had it for 2 weeks) item….Read more

…difficult to use before it rusted and became extremely difficult and unreliable. I am very disappointed with this product. Waste of money.Read more

Works well, only issue is the key sometimes can get stuck and not lock, which makes things frustrating when locking up outside in the rain….Read more

135 customers mention ease of use, 102 positive, 33 negative

Customers find the bike lock extremely easy to use, with one customer noting that the key works well in cold weather.

A strong lock. Easy to use . a little heavy but you pay for the tough manufacture. Hope it remains strong and protecting my vintage Raleigh Grifter.Read more

…Easy attachment to carry them with you and quick and simple to install and lock your bike up with….Read more

Great protection and easy to lockRead more

Very strong, a little heavy and cumbersome, but I'm sure it will be up to the job,Mir ever the occasion arises ( hopefully never !)Read more

293 customers mention weight, 102 positive, 191 negative

Customers have mixed opinions about the weight of the bike lock, with some finding it not too heavy while others note that the cable is fairly heavy to carry around.

The body of the lock is metal and its heavy, it should have been coated, its not coated so its a heavy metal that can dent your bicycle when lockingRead more

…Seems sturdy enough – with a gold rating for a good price. Not too heavy. Although slightly fiddly the mounting bracket works well….Read more

…to the frame is a bit annoying but you have to do it because it is quite heavy so it makes a real difference having to put it in your rucksack….Read more

Positives: Seems quite secure Negatives: Very heavy but quite small Quite fiddly to lock and unlock…Read more

235 customers mention difficulty to unlock, 34 positive, 201 negative

Customers find the lock difficult to operate, reporting issues with the mechanism jamming and the key getting stuck.

The lock is a bit fiddly to get to. The bracket system is rubbish. But no doubt it is strong steel.Read more

After just 6 months it locked and was difficult to open to the point it completely failed, eventually opening after hour of constant trying,, home…Read more

…it sometimes gets stiff and hard to unlock but WD40 usually does the trick to loosen it up.Read more

The lock is difficult to open and I need to fiddle around to get the key to engage. Missed a few trains thanks to this.Read more

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Kerry Louise
Solid and Reliable Lock — Worth the Price
Reviewed in the United Kingdom on 7 November 2025
Style Name: KryptoLokConfiguration: SingleVerified Purchase
My husband said it Feels really sturdy and well built. The lock mechanism is smooth and doesn’t jam like cheaper ones he's used. It’s got a good weight to it without being bulky to carry. It gives him confidence leaving his bike locked up. A proper bit of kit if you want security and peace of mind.
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Michael Thackeray
Feels secure and reliable, worth the extra weight
Reviewed in the United Kingdom on 14 July 2025
Style Name: KryptoLokConfiguration: SingleVerified Purchase
This is a seriously solid lock that gives you a real sense of security. The U lock alone is thick, heavy, and feels virtually tamper-proof. The included flex cable is a great addition, giving you more options to loop through your wheels or around awkward railings or posts. I’ve used it to lock both my frame and rear wheel with the U lock and then looped the cable through the front wheel. That versatility makes a big difference in urban areas where secure anchor points aren’t always ideal.
While it is heavier than cheaper alternatives, the added weight feels justified by the protection it offers. I’d much rather carry a little extra bulk than come back to a missing bike. The lock mechanism is smooth, and the key turns easily without sticking, which I appreciate after past frustrations with cheaper locks.
Pros:
Heavy-duty and high quality
Flexible locking options with included cable
Smooth key operation
Cons:
A bit bulky for smaller backpacks
It might be overkill for low-crime areas
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Paul
Cost effective Sold Secure Silver lock
Reviewed in the United Kingdom on 1 August 2016
Style Name: Flex Cable – 2008 EditionConfiguration: SingleVerified Purchase
I purchased this to leave at the office, so I don't have to drag my lock back and forth. It is a pretty standard 'D' lock, with a short (4 foot) cable. It has a handy velcro loop to tidy up the cable into a loop. It comes with two keys and a bracket to attach it to your bike (which I have not used).
This is the KryptoLok Series 2, it is part of the Sold Secure range, at the Silver level (NOTE: the cable isn't recognised as Sold Secure and could be easily cut, it will only help prevent somebody pinching your wheels). Sold Secure Silver level offers enhanced security, but with cost compromises from the highest level (Gold) and often lower weight than Gold. Bronze is only recommended to stop opportunist theft. If you need a secure cable, there are Silver and Gold options on offer.
The replacement guarantee from Kryptonite is full of weasel words and reading through it I decided I would almost certainly not get my money back in the event of a theft. The limit is £800 in the UK for reference.
In use the lock works well and I can bolt my frame securely and protect my wheels with the cable. I cannot get the lock around the fence post (looks like a scaffold pole diameter) and through both the rear wheel and the frame. The lock mechanism works well and is easy to unlock, unlike some I own. I thread one end of the cable through a wheel, through an eyelet and then round the other wheel and put the loop into the D lock before I close it. I ride a 20" mountain bike frame on 26" rims, but if you have something with a longer wheel base, you might find that 4 feet is too short.
All in all, I am happy with the purchase. I knew the guarantee would be almost worthless, but it's a decent lock and protects my cheap unfashionable bike in a low risk environment. I would not use this to leave my bike in a public place all day e.g. rail station, bike racks at school, etc. You'd want Gold for that.
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3 people found this helpful

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AcidOllie
Great quality and customer service
Reviewed in the United Kingdom on 17 October 2025
Style Name: KryptoLokConfiguration: SingleVerified Purchase
Although it's not going to stop power tools getting through it it's still well worth the money and much better than cheaper alternatives. It will easily stop the opportunistic thieves and Kryptonite's CS is very good as they offer key replacements amongst other things.
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Luke
Strong bike lock
Reviewed in the United Kingdom on 30 November 2025
Style Name: KryptoLokConfiguration: SingleVerified Purchase
Always used Kryptonite products and never had an issue. Good quality and sturdy.
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James
Best of the entry-level "serious" locks.
Reviewed in the United Kingdom on 17 February 2016
Style Name: Flex Cable – 2008 EditionConfiguration: SingleVerified Purchase
I purchased this lock after reading that Oxford is the bike theft capital of Europe. I was unaware that such prizes were awarded and I'm sure that Kryptonite fund them in order to boost panic.
In any case it worked for me and after doing some research I picked this lock. It seems to be the entry level serious lock. I've watched youtube videos of people having to try to cut through having lost their keys and clearly it means business.
Having the cable along with the D-Lock is the best way forward. It allows you to lock another bike to yours, secure the front tire, and also loop round a second fixed post.
The D-Lock is solid but light enough to be practical. The key system works well but does require regular oiling to ensure that it stays free moving. A couple of the 3 star reviews have noted that the lock seems to stick after a few months. A small spray of WD40 once a month will fix this and can easily be incorporated into general bike maintenance. The key is easy to use in cold weather, just make sure that you always push it to the very bottom of the lock before twisting or apparently you can damage the barrel.
The mount is excellent, I have mine mounted onto the vertical bar of the seat tube and that seems to work very well. Some people seem to have struggled to mount the bracket. I have no idea why, it's incredible easy and has the advantage that the mount position can be moved it you add more accessories or simply feel the need to change the position.
The Amazon price was the best I could find online and the Prime delivery sealed the deal. I would definitely recommend this lock, if my bike gets stolen now it's likely to be my own fault for drunkenly locking it to something silly, like a policeman.
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7 people found this helpful

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Carlito
Good sturdy gold standard lock
Reviewed in the United Kingdom on 9 September 2025
Style Name: KryptoLokConfiguration: SingleVerified Purchase
Good solid bike lock, needed to have gold standard for my bike insurance and Its suitably heavy and sturdy to make my bike feel safer.
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Top reviews from other countries

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Ramses Cisneros Flores
excelente producto , fascinado
Reviewed in Mexico on 14 September 2020
Style Name: KryptoLokConfiguration: SingleVerified Purchase
La marca Kriptonite es una de las mas importantes y con gran experiencia en seguridad , en este caso para las bicicletas nos ofrecen un candado en forma de U muy seguro, resisten y funcional, manejando un precio accesible por el vendedor, se los recomiendo bastante ya que ofrece un alivio al dejar su bicicleta, claro tomando en cuenta aspectos de la localidad donde se encuentran, el lugar donde la encadena etc, pero es imponente para cualquier persona de lo ajeno, un aspecto a tomar es que cuando lo comiencen a usar, colóquenle afloja todo o dw40 para que no haya roces con la llave y la entrada esto por lo nuevo del articulo.
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Client d'Amazon
Bien mais longueur du U un peu juste pour une efficacité optimum
Reviewed in France on 10 January 2026
Style Name: KryptoLokConfiguration: SingleVerified Purchase
Cet antivol semble solide. A l'usage le U est un peu court pour bien attacher un VAE à un point fixe. Le câble permet d' y arriver mais c'est probablement moins sur qu'avec le U.
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Amazon Customer
excellent lock
Reviewed in the Netherlands on 29 April 2021
Style Name: KryptoLokConfiguration: SingleVerified Purchase
Safest lock out there, comes with 2 keys and with holder to be mounted on the bike frame
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James Cowan
Good lock. This combo is possibly the best value, all things considered
Reviewed in Canada on 19 August 2014
Style Name: Flex Cable – 2008 EditionConfiguration: SingleVerified Purchase
I received this Kryptonite Kryptolok Series 2 U-lock combo (with 4 ft cable) very quickly, within a couple days of ordering, which was great. It's just what I expected and functions well. Also, on the bar, that little piece of black that you see is actually a small collar that you can rotate to cover up the lock opening itself to protect it somewhat from dirt and the weather. I considered going up a model or two, i.e. the New Yorker lock. But I did my research, and after reading multiple reviews, tests, comparisons, agreed that for day-to-day use, this lock is plenty strong against 90% of would-be thieves, who are opportunists or addicts after something that is quick to liberate and easy to sell and won't be able to break this lock without serious effort and drawing a lot of attention. The other 10% are 'pros' who, with a grinder, can cut through pretty much any U-lock anyhow including the New Yorker models (and tend to do so after dark). With common sense & proper precautions (don't leave your bike locked on the street overnight; make sure you lock your wheels into the U-lock directly or with the cable), this should foil all daytime thieves. It IS a bit heavy – which is to be expected, and is the unavoidable trade-off for a very strong lock. My research also showed that the mounting clips for these types of locks generally fail to do their job – BECAUSE the lock is heavy. Knowing that, I also decided to invest in a small rear rack so that I can carry the lock with me in a bag there, rather than fussing around with an imperfect mounting clip system that will fail sooner or later, or having it weigh down my shoulders in a backpack. When reading others' reviews I noticed that some have complained that, after time, their locks rust or seize up inside, and they are left with the predicament of not being able to open an almost unbreakable lock. Well, two things here. First, as with ANY lock (especially those exposed to the elements), treat it with some graphite powder, which helps keep the mechanisms smooth, AND probably carry a little squeeze bottle of lock de-icer in sub-zero weather just in case it ices up. Second, if one day down the road the lock does simply fail and seize, then just rent a battery operated grinder and cut it off. People complain about too many small issues that common sense and some flexibility will take care of quickly. Overall, very happy with this purchase – for something like $40 I feel like I have got a good value and can safely lock up my bikes downtown now when I'm out and about. If it does develop problems after further use, I will return and update this review.
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Tigerman82
Amazing, improved U-lock that doesn't break the bank
Reviewed in Germany on 9 May 2019
Style Name: KryptoLokConfiguration: SingleVerified Purchase
I bought the previous version of this cheaper U-lock from Kryptonite back in 2011. I live in a city where bike thefts are extremely common and yet my bicycle (a Nishiki hybrid) was never stolen. Unfortunately my Kryptolok developed the key jam issue and no amount of lubricant or even using the spare key helped. I therefore went for this newer model which now has a Gold rating instead of a Silver rating of the earlier model.
I was pleasantly surprised that the bracket had been improved as with the earlier model I always had issues with detaching the lock from it. This new bracket is more adjustable, easier to tighten and the lock detaches effortlessly. The U-lock itself is nicer as now the key hole is at the the center of the lock which means you are less likely to put too much pressure on the key when locking and unlocking. The key hole cover is also much easier to use as its just a small cover you slide on top of the key hole.
I did think about buying a slighly more expensive and secure model but in my opinion this is probably the best value bike lock you can find (the general opinion at least in my location seems to be that U-locks are better than any other lock type and Kryptonite is usually more durable than Abus or some other brand). Highly recommended for the price!
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