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Kryptonite Evolution Mini-5 Bicycle U-Lock with Transit FlexFrame Bracket (3.25-Inch x 5.5-Inch)

4.4 out of 5 stars 130 customer reviews
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  • 13mm hardened MAX-Performance steel shackle resists bolt cutters and leverage attacks
  • Higher security disc-style cylinder
  • High security Bent Foot(TM) design
  • 3 keys - one lighted with high intensity bulb & replaceable battery
  • Includes Transit FlexFrame Bracket for easy mounting to frame tubing 25mm to 80mm wheter round, oval, triangular, or square. Also features 360° rotation providing the ability to better fit and align with a bike frame's specific geometry.
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Frequently Bought Together

  • Kryptonite Evolution Mini-5 Bicycle U-Lock with Transit FlexFrame Bracket (3.25-Inch x 5.5-Inch)
  • +
  • Kryptonite Kryptoflex Looped Cable - 4ft. x 10mm 720018-210818
Total price: $63.47
Buy the selected items together

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Technical Details


Product Description

The choice of bike messengers worldwide with a $2000 USD anti-theft protection with a security rating of 9 of out 12.Kryptonite U-locks represent extreme security while maintaining a realistic size/weight. U-locks represent the most popular lock for enthusiasts.In the early 1970s, Michael Zane was a free-spirited, bearded kid with a VW van and a big idea for a new kind of lock. He traveled thousands of miles showing the unique U-shaped locking device and spreading his passion for bicycle security to bike dealers all around the country and forged lifetime relationships. The company soon expanded its product line to include powersports, hardware and snowsports security.

Product Details

For warranty information about this product, please click here [PDF]
  • Product Dimensions: 5.5 x 1.2 x 3.3 inches ; 2.2 pounds
  • Shipping Weight: 2.3 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B005YPK9C0
  • Item model number: 152065
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (130 customer reviews)
  • Amazon Best Sellers Rank: #5,831 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • For warranty information about this product, please click here [PDF]

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
This u-lock has definitely exceeded my expectations. I have a Women's Specialized Vita Sport and I can lock the frame and back tire to a bike rack with no issues. Horyay! It's a snug fit which I combine with added security of the KryptoFlex. I am very happy I went with the Mini-5 as it's light and obviously not bulky to carry, however I did install the mount so it's rattles a bit when I ride. It's not a big deal but eventually I will have to watch some videos or read up on how to eliminate that. If you're going to install the mount I HIGHLY suggest watching "How to Install Kryptonite's Transit FlexFrame-U Bracket" by KryptoniteLocks. The detail and up close views are perfect for figuring out that pesky little rubber piece!
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Verified Purchase
I bought this lock four months ago because I had gotten tired of lugging a 9-inch Kryptonite lock and cable to secure my front wheel and frame. I also had learned that longer locks actually make your bike more vulnerable to theft by giving thieves an opportunity to get more leverage with tools.

The Lock: The lock is what you would expect from Kryptonite. It is compact, well-protected by its rubbery coat, and smooth to operate. It still has some heft to it (don't expect it to be feather-light), and fits in my back jean pocket easily. It comes with a mount that I never bothered to install. Like other reviewers have stated, the mount comes with incomprehensible installation instructions (this is why I knocked a star off, otherwise I would have given full stars).

Using The Lock: I also purchased a locking skewer (from Pinhead) for my front wheel so that I wouldn't have to carry a cable at all. With your front wheel secure, you only have to lock up the back wheel. When I had originally purchased the lock, I was afraid that I would find myself unable to lock my bike to larger poles and what not due to the small size of the U. However, over months of use this has NEVER happened. Perhaps this is because I am fortunate enough to live in a rather bike-friendly area with lots of actual bike racks. However, even when a legit bike rack was not available, I have always found something that I could lock to. Thinner to medium-sized street poles or stair rails have always worked. If you live in an area where huge poles are the only solution to lock your bike to, this lock will not be for you.

I have had this lock for over four months now, with no theft.

Bottom Line: This is a great, secure lock for people who do not want to lug around a huge lock.
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Verified Purchase
Good, sturdy lock, though I wish I had bought the 7" instead. With my mountain bike wheels it's a very tight fit for most lockup locations. The 7" (which I also bought for another bike) is the perfect size.

The mount that comes with this is also very nice, and doesn't move at all once properly installed. Ignore the manual and instead go to YouTube and watch their installation video: https://www.youtube.com/watch?v=QqaqSG-lfGo. If the link is dead search for "Kryptonite Transit FlexFrame-U Bracket". It's much easier to understand.

As for the theft insurance, make sure you register for it within 14 days of purchase or they may try to deny your claim. It's in the fine print, and not obvious that you have such a deadline.
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Verified Purchase
Small enough to mount to your bike or carry. Used with a double loop cable this provides excellent security! The smaller size removes leverage from would be thieves, the flex frame allows the lock some room to flex again helping with leverage attacks. Using the sheldon locking method this is a must have for Commuters! It is too small for my Mountain Bike but works great for my road bike for anyone curious about size.

The mounting bracket works great for me, finding the proper location where it is not in the way is the problem. As you can see in the picture provided this is the best place to mount it in my case. I have tested it via riding on more rough terrain as well and it stays secure.
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Verified Purchase
Wonderfully light and strong lock, with a very flexible and secure mounting system. Product loses a star due to extremely illegible and poorly written mount instructions and pictures that are so small as to be useless, and no electronic version of the instructions on vendor web site.

Mounting help: To install this mount securely you need two people, period. Be sure the nylon band is threaded through the mounting bracket so that the bracket pinches the band between the bike and bracket when the lock mount is screwed into the bracket. Use your assistant to keep the band very taught while you screw the lock mount into the bracket. This undocumented mounting process results in an extremely secure mount that can be placed in many frame and seat post locations. Be sure to note that the mounting clip on the lock itself can be swiveled 360 degrees for proper positioning of the lock almost anywhere on your bike.

Addendum 6/1/2014: While this lock is too small to fit around a wheel, frame and most bike racks, it will usually fit around a wheel and most racks, at least with my 28mm tires. The advice I have read recommends threading the lock through the section of the rear wheel within the triangle formed by the seat tube and the rear hub stays. The thief would have to destroy the rear wheel or cut the lock to get the bike, and they usually don't bother. Unless you take the front wheel with you (or carry dual locks), it is vulnerable, but also cheaper to replace than the bike.
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