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Kryptonite Kryptolok Series 2 Mini Bicycle U-Lock with Transit FlexFrame Bracket, 3.25 x 7-inch

4.5 4.5 out of 5 stars 438 ratings
Merlot
Brand Kryptonite
Special Feature Anti theft
Lock Type Key Lock
Item dimensions L x W x H 9.06 x 2.36 x 5.91 inches
Material Alloy Steel

About this item

  • 12.7mm Hardended Performance Alloy Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks
  • Interior Locking Dimensions; 4" x 11.5"
  • Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them.
  • Anti-Theft Protection Offer; Up to $1,750 Reimbursement
  • Lifetime Warranty
  • Now available in 4 new colors: Pearly White, Merlot, Blue and Orange
  • 13mm hardened Performance steel shackle resists cutting and leverage attacks
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Top Brand: Kryptonite

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Kryptonite

Kryptonite Kryptolok Series 2 Mini Bicycle U-Lock with Transit FlexFrame Bracket, 3.25 x 7-inch

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
438 global ratings

Customers say

Customers like the value of the lock. They say it's a good lock for the price and perfect for a valuable road bike. They are also happy with appearance, and performance. However, some customers disagree on ease of installation, keys, quality, weight, and size.

AI-generated from the text of customer reviews

49 customers mention41 positive8 negative

Customers like the appearance of the lock. For example, they say the white color looks very nice, chic, and stands out. Some mention that the mount looks fancy. Overall, most are satisfied with the appearance and functionality of the product.

"...The white color looks very nice, and matches my bike, which is a plus...." Read more

"...I like the bright orange color of the U lock that I got—higher visibility for thieves to notice the U-Lock when they are looking for an easy..." Read more

"The orange fades, but it still looks great with my bike...." Read more

"...The lock itself is beautiful (I got the white one) and looks super chic...." Read more

49 customers mention43 positive6 negative

Customers like the performance of the lock. They say it works fabulous, is perfectly good, and highly theft-resistant. Some mention that the bracket works much better than the bracket that came with their previous kryponite. The key works great, and it goes very nicely with their blue Schwinn Bike Bell. The mount works fine, and the clamp works well.

"...It's still working great, but now I have a second bike.The white color looks very nice, and matches my bike, which is a plus...." Read more

"This is a Great Lock for general every day bicycle locking. Works great and is easy to operate. Bike holder is almost useless!..." Read more

"This is my favorite lock right now, but it isn't perfect. The holster is good, but it can be difficult remove the lock from it...." Read more

"...Once properly installed, the clamp works well and the lock is a good deterrent...." Read more

12 customers mention12 positive0 negative

Customers appreciate the value of the lock. They say it's a great lock for the price, and well worth the money. Some customers also mention that it'll be perfect for a valuable road bike.

"...All in all, this is a solid lock that does a great job for a reasonable price." Read more

"...I think this lock is worth the $40, as long as you can avoid breaking it due to winter ice." Read more

"...Overall, it's a good lock for the price, but your first ride should be to the local hardware store if you want to use the mount." Read more

"...That said, it's a sturdy lock that is reasonably priced...." Read more

122 customers mention83 positive39 negative

Customers are mixed about the quality of the lock. Some mention it's a good lock, sturdy, and secure. However, others say that it'll be hard to lock the frame with wheel and pole as it is. They also say that the key turns easily in the lock and it can be difficult to remove the lock from it. Overall, the lock has mixed opinions.

"...What else can I say? Its a great bike lock, that doesn't weigh as much as larger sizes (duh)...." Read more

"This is a Great Lock for general every day bicycle locking. Works great and is easy to operate. Bike holder is almost useless!..." Read more

"...I'm pretty happy with this product. I think it balances security with convenience and is really easy both to use and transport...." Read more

"...The holster is good, but it can be difficult remove the lock from it...." Read more

48 customers mention31 positive17 negative

Customers are mixed about the size of the lock. Some mention that it's the perfect size to fit in their front bag, and perfect for a valuable road bike. However, others say that it was too small, and doesn't actually fit many places. They also say that the thick body make it nearly impossible to fit the lock around a secure place.

"...I think it balances security with convenience and is really easy both to use and transport...." Read more

"Heavy duty lock, minified. I did a lot of research into bike locks, I ride mainly trails but the occasion city ride also...." Read more

"...Also note that the lock is very narrow (which is good because it makes it difficult to pry) so if you want something big enough to lock a tire and..." Read more

"...I thought the lock would be too small, but it fits around my road bike well." Read more

38 customers mention25 positive13 negative

Customers are mixed about the ease of installation. Some mention that it's easy to mount and use, with an excellent mounting system. However, others say that the mount is a royal pain to install, the instructions are confusing, and the mounting kit is unnecessarily complicated.

"...Works great and is easy to operate. Bike holder is almost useless! I always put my lock into a bag on the bike rack. Always have. Always will...." Read more

"...Easy to use, sturdy lock with 2 star ART rating, which for me is good, especially for the price point. Would highly recommend." Read more

"...The mounting kit, as others have pointed out, can be a little tricky to install, but I think Kryptonite has changed some things to make it even..." Read more

"...my water bottle takes up too much space to affix it there. The attachment is secure and the lock really doesn't rattle even though I have to take a..." Read more

12 customers mention7 positive5 negative

Customers are mixed about the weight of the lock. Some mention that it's not too heavy and the quality feels sturdy, while others say that it is a bit heavy and a burden to carry around.

"I like this its not too heavy and quality feels sturdy... a bit hard to lock frame with wheel and pole as it is pretty small but I like to bring..." Read more

"...By no means is this a “light” option, which makes it kind of a burden to carry around all over—but you have to understand the tradeoff...." Read more

"...It's really heavy (which is a good thing) and cannot be opened or anything without the key...." Read more

"...It's a bit heavy though if you are toting it around." Read more

7 customers mention4 positive3 negative

Customers are mixed about the keys. Some mention that they get two keys with the lock, as well as a little kit to attach a lock holder to. Others say that no such attachment came with the product, and that the mount for the lock is useless.

"...You get two keys with it, as well as a little kit to attach a lock holder to your bike, which is great...." Read more

"...No such attachment came with the lock. When I am riding my bike, I have to carry it in my backpack, and it does have some weight...." Read more

"...Comes with two keys if you need a spare but I just have both on the same keychain...." Read more

"The actual lock is a nice size for locking 1 bike. But the mount for the lock is useless...." Read more

Right color, right price fits my needs.
4 Stars
Right color, right price fits my needs.
The lock is just the right size for my new Trek Neko. Bike theft is, thankfully, not a huge problem where I live but I feel like this is a step up from the cable lock I was using on my old department store bike. If you happen to have a Trek bike this lock is almost the exact same shade as California Sky Blue. Based on other reviews and comments I did spray a little bit of silicone lubricant into the lock prior to use.Cons: the only con is the mount. Maybe mine is defective but it's almost impossible to remove from the mount. I didn't even bother putting the mount on my bike since I have a rack that it fits nicely on.
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Top reviews from the United States

David M.
5.0 out of 5 stars Bought it again, love it again
Reviewed in the United States on October 30, 2016
Verified Purchase
Nothing says good product like a repeat purchase.

Bought a used grey version of the same lock 3 years ago. It served me well at college, and in the city of San Francisco where I never once lost a bike with this lock. It's still working great, but now I have a second bike.

The white color looks very nice, and matches my bike, which is a plus. It can get dirty with bike grease, but no surprise there, and it wipes clean very easy.

What else can I say? Its a great bike lock, that doesn't weigh as much as larger sizes (duh). It's also harder to break into, since there is less room to maneuver inside of the U.
4 people found this helpful
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Pcprntr
5.0 out of 5 stars JUST THE RIGHT SIZE FOR GENERAL EVERYDAY USE..!!
Reviewed in the United States on August 9, 2015
Color: MerlotVerified Purchase
This is a Great Lock for general every day bicycle locking. Works great and is easy to operate. Bike holder is almost useless! I always put my lock into a bag on the bike rack. Always have. Always will. Works much better that way. Lock dimensions are: 3 1/4" inside of the 'U' and 7" from the inside top of the 'U' to the top of the lock cylinder. OVERALL SIZE IS: 6" across the lock cylinder and 9" from the top of the 'U' to the bottom of the lock cylinder. Hope this helps some of you that are wondering just how big this 'mini' U lock is. Would recommend to anyone needing a 'Medium Size' U lock for their bicycle or whatever.
4 people found this helpful
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Alex
5.0 out of 5 stars Excellent way to protect your bike
Reviewed in the United States on May 14, 2015
Verified Purchase
I've started riding my bike more often now that I've moved further from the places to which I frequently used to walk. After reading up on how to best protect an investment like a bike, there is a pretty strong consensus that a U lock is your best bet—and that the smaller it is, the better, preventing would-be thieves from using tools to force it open. I'm pretty happy with this product. I think it balances security with convenience and is really easy both to use and transport. The mounting kit, as others have pointed out, can be a little tricky to install, but I think Kryptonite has changed some things to make it even easier: the rubber was stitched on to mine, so there was no need to measure and cut it to fit. All in all, this is a solid lock that does a great job for a reasonable price.
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Alex
5.0 out of 5 stars Excellent way to protect your bike
Reviewed in the United States on May 14, 2015
I've started riding my bike more often now that I've moved further from the places to which I frequently used to walk. After reading up on how to best protect an investment like a bike, there is a pretty strong consensus that a U lock is your best bet—and that the smaller it is, the better, preventing would-be thieves from using tools to force it open. I'm pretty happy with this product. I think it balances security with convenience and is really easy both to use and transport. The mounting kit, as others have pointed out, can be a little tricky to install, but I think Kryptonite has changed some things to make it even easier: the rubber was stitched on to mine, so there was no need to measure and cut it to fit. All in all, this is a solid lock that does a great job for a reasonable price.
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23 people found this helpful
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nalletto
4.0 out of 5 stars Great lock, just buy some lock de-icer if using in the winter
Reviewed in the United States on May 13, 2016
Verified Purchase
I have been using Kryptonite U locks for a few years now and I have never had my bike stolen. In fact, I’ve never had an attempted theft of my bike (that I know about). I ride my bike to work every day, and (unfortunately) the company I work for doesn’t offer indoor bike storage, nor do they allow me to bring my bike into the building with me. So I am relegated to leaving my bike out in the parking lot all day. I work in a city that has a reputation of having a little bit higher crime than the rest of the state, so I wanted to get a bike locking system that would deter thieves from even considering stealing my bike.

Here’s my boiled-down review:
Pros:
• U lock actually locks on both sides, making power tools the only real option for thieves
• Comes with a nice, thick, steel cable to secure your wheels and/or seat in addition to your frame
• I like the bright orange color of the U lock that I got—higher visibility for thieves to notice the U-Lock when they are looking for an easy target
• These Kryptonite locks come with a warrantee that guarantees your bike from theft for the first year (unless you live in New York). You do have to jump through some hoops right when you purchase the lock to qualify for the coverage, but in my opinion it’s worth it, especially considering many people spend more than a couple hundred dollars on a bike.

Cons
• The plastic sleeve that is supposed to keep water out of the locking mechanism is worthless
• By no means is this a “light” option, which makes it kind of a burden to carry around all over—but you have to understand the tradeoff. Light usually = easier to break. I’m putting this as a “con,” but I don’t see a simple, inexpensive way to remedy this.

Some additional thoughts and my experience:
Originally I decided to go with the Kryptonite Kryptolok because it comes with a cable that I can wrap around my front wheel and frame and lock it to the U lock that I use to secure my back wheel and bike frame to the bike rack. I also like that this “locks” on both sides of the U. Technically, you only lock one side with your key, but the other side of the lock has a little elbow that, when inserted into the base of the lock, makes it impossible to twist or be pried off. Be realistic though—if someone comes along with power tools at just the right (wrong) moment, they are going to get your bike. Nothing is completely theft-proof.

This lock has worked great for me with 1 exception: The lock comes with a little plastic sleeve that is supposed to cover the keyhole to keep water out. It doesn’t do a dang thing. I always leave the U-Lock and cable locked to the bike rack in the parking lot at work so I don’t have to lug it around with me all the time (it’s not light). I ended up ruining my first Kryptonite U lock this past winter (January 2016) because, notwithstanding the plastic sleeve, water still got into the lock and froze over night. I tried to force the key into the key hole when I arrived the next morning, and then tried forcing the key to turn. The key ended up bending, and the lock never opened. That lock is now useless, permanently locked to the bike rack at work…I’m glad this happened in the morning when I got to work rather than after work when my bike would have been locked up already.

When I purchased the replacement U lock, I went with the smaller Kryptonite Kryptolok Series 2 Mini, florescent orange (so the thieves can see it first thing when they see my bike). I also invested in a little canister of lock de-icer so I don’t ruin the lock next winter.

I think this lock is worth the $40, as long as you can avoid breaking it due to winter ice.
2 people found this helpful
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Amazon Customer
5.0 out of 5 stars This is my favorite lock right now
Reviewed in the United States on February 12, 2017
Color: MerlotVerified Purchase
This is my favorite lock right now, but it isn't perfect. The holster is good, but it can be difficult remove the lock from it. It's a little tight and I've jammed and smashed my fingers a few times using it. Also note that the lock is very narrow (which is good because it makes it difficult to pry) so if you want something big enough to lock a tire and your frame to the rack, get a larger lock. Still, I recommend Kryptonite.
One person found this helpful
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Alysse
5.0 out of 5 stars Mighty mini lock
Reviewed in the United States on May 28, 2017
Verified Purchase
Heavy duty lock, minified. I did a lot of research into bike locks, I ride mainly trails but the occasion city ride also. For those times I'm on campus or downtown, I wanted a small, lightweight lock that would hold up to bike thieves and I've been happy so far. I have a Specialized Jinxx (S) and I was hoping that the mini size would fit the smaller frame, it doesn't, but I'm of small stature so my seat isn't even raised up. A taller person would be able to easily add it to the under seat area for storage. I carry it in my backpack, thus weight was a more important factor to me. Easy to use, sturdy lock with 2 star ART rating, which for me is good, especially for the price point. Would highly recommend.
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rolex
5.0 out of 5 stars good lock, want it in blue next time.
Reviewed in the United States on July 21, 2017
Verified Purchase
The orange fades, but it still looks great with my bike. I'm waiting for it to fade quickly so I can have a white lock instead of a orange one lol.
It's fading but, I had the bike out locked up in all weather for about 4 months now, and it only faded a little bit so far-noticeable to the owner of the lock and not to others.
I don't use the lock holder, so I can't comment on it.
I thought the lock would be too small, but it fits around my road bike well.
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kc
5.0 out of 5 stars I like this its not too heavy and quality feels sturdy
Reviewed in the United States on December 16, 2016
Verified Purchase
I like this its not too heavy and quality feels sturdy... a bit hard to lock frame with wheel and pole as it is pretty small but I like to bring this lock if i'm just stopping somewhere for 10 minutes. Its a convenient size to put in bag.
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Top reviews from other countries

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paolo lupo
5.0 out of 5 stars sicuro e resistente
Reviewed in Italy on November 16, 2023
Color: MerlotVerified Purchase
dopo anni non ha nemmeno un graffio, comodo sicuro e resistente....
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Da
5.0 out of 5 stars bon rapport qualité prix
Reviewed in France on January 13, 2021
Verified Purchase
Pas très solide, un seul point d'attache.
Rouille vite et se grippe, donc il faut penser à le graisser (je l'ai graissé 2 fois en 2 ans). Mais rapport qualité prix plus que correct, d'où ma note.
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Maria
5.0 out of 5 stars De los mejores candados para Bicicletas
Reviewed in Mexico on April 22, 2019
Color: MerlotVerified Purchase
Sin duda la marca Kriptonite ofrece de los mejores seguros para bicicleta en el mercado, aunque uno pueda encontrar opciones más baratas aquí mismo, no ofrecen el mismo diseño y calidad. Este candado esta recubierto por un material que protege la pintura tanto de la bicicleta como del candado al estar en contacto. Por igual incluye un porta seguro muy fácil de colocar que permite traerlo siempre consigo de una manera super practica. En desafortunadas experiencias puedo decir que los candados en U son la mejor inversión que puedes hacer para proteger tu bicicleta y recomiendo por mucho esta marca.
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Brenda
5.0 out of 5 stars Perfecto!!
Reviewed in Spain on July 5, 2020
Verified Purchase
En mi caso, para un patinete Xiaomi, funciona PERFECTO, es facil de poner/quitar y llevar.
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Delfina
5.0 out of 5 stars Buen candado
Reviewed in Spain on May 5, 2019
Verified Purchase
El candado es lo que esperaba y es exactamente lo que está en la descripción. Muchos amigos ciclistas me recomendaron esta marca pero es el primero que tengo así que no puedo decir mucho más que lo que saben ellos. La seguridad es de 6 y eso es suficiente para poder dejar la bicicleta unas horas sin preocuparme. Un detalle es que un amigo se dejó la bicicleta atada con este mismo modelo de candado a un poste en un barrio donde roban muchas bicicletas durante un mes y nunca pudieron volar su candado. El tamaño me parece ideal porque no es muy grande pero sí lo suficiente como para atar la bicicleta a los postes de luz sin problemas. Con respecto al envío llegó en perfecto estado, tiempo y forma. Me parece una buena inversión tener un candado kryptonite.
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