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Kryptonite Keeper 12 Standard Bicycle U-Lock with Bracket Bicycle U-Lock (4-Inch x 8-Inch)

3.4 out of 5 stars 334 customer reviews
| 5 answered questions

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  • Kryptonite Keeper 12 Standard Bicycle U-Lock with Bracket Bicycle U-Lock (4-Inch x 8-Inch)
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Technical Details


Product Description

Kryptonite Keeper U-Locks Item Specifications: Lock Size 4x9 Bracket

Product Details

  • Product Dimensions: 1 x 4 x 8 inches ; 2.5 pounds
  • Shipping Weight: 2.5 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B000BL1P3O
  • Item model number: 134962
  • Average Customer Review: 3.4 out of 5 stars  See all reviews (334 customer reviews)
  • Amazon Best Sellers Rank: #5,624 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

So I initially wrote: "The lock may be fine but the mounting bracket is terrible (unless I'm missing something... In which case please tell me). The silver part on the 'U' lock itself, which is supposed to slide into the black plastic mounting bracket, faces the wrong way. It's hard to describe but basically you can't clip the lock onto your bike and have sit (or hang) within that triangle made by the main bars/beams. Instead it sticks out and will get in the way of your peddling. Very annoying."

But I WAS missing something. You can use the Hex Wrench that comes with it to loosen and rotate the silver part (which I think is actually called the 'spline on the shackle'). So this lock mounting thing is not a problem. Go ahead and buy it. No extra tools or anything are required. I totally take back my bad review. I'm still only giving it 4 stars because they shouldn't sell it with the shackle tightened in a position that isn't useful to anyone.
2 Comments 62 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Caught the guy stealing my bike. It happened so fast, not sure what tool he used, scared him off and saved the bike.
I looked at Kryptonite website to hopefully get the lock replaced but they seem to only have a guarantee of the bike is stolen and you need proof of sale for the bike. Silly because for me and a lot of other people I bought mine with cash on Craigslist.
Lock
Worked well until it was cut
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The lock is good but on a scale of 1-12 (12 being safest) this lock rates at a 7. This is Kryptonite's scale, not mine. Since I live in a downtown, sea-side area, bikes get stolen all the time. I use this lock in addition to a thick cable lock. Between locking the bike frame to a solid object using this lock, I intertwine the cable lock (figure 8 style) through & around the frame and through and around the tires. In doing this, even if they break this lock, they still can't ride off AND, they can't steal my tires very easily.
Another suggestion... loose the quick release on your seat. It's hell having to stand and pedal if they steal your seat. Don't make it easy on them.
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By MLC on September 14, 2010
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The tube is too thin to provide enough strength against using tools to cut off. My bike was stolen this evening in front of a crowded subway station, the lock got cut off completely. I won't recommend this lock to anyone who is going to park their bike in public space for more than 5 minutes.
3 Comments 63 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Pros: Lightweight. Large enough for two bikes. Decent bracket.
Con: I often have to fight to get the lock open.
Comment 24 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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I've had this lock for almost a year now. First thing, all of the reviews complaining about the clamp being on the wrong side are just foolish. The clamp can easily be changed around via a simple bolt, and it can be made to fit any need. I've had the lock clamped to my bike the entire time and it works great and doesn't slide around or fall off.

You'll also read a lot of reviews about this thing being broken. The thing is nowadays there are mini tools that can cut through just about anything, and quickly. I view this thing as more of a deterrent than a 100% full proof lock. Therefore I've used this lock combined with a thick chain lock to keep my bike secured in downtown Fort Lauderdale, and at the beach. It's always been kept outside. To put that in perspective, when I moved to the beach 4 out of 5 bikes were stolen from my building in less than 2 months... mine was the only one that wasn't. To be fair, I noticed most of the bikes had minimal security, such as small basic cable locks only, which were quickly cut (most of them were taken during the day!).

Another thing is that where possible, you'll want to keep the keyhole pointed downward. I had his thing in the rain for so long with no issues, but one time the keyhole was pointed up and a heavy rain came through, and it was full of rust and pouring out just the same. Nevertheless, it's still held up and still does. But since the rain I've had the occasional complication with the lock mechanism. All in all, for the price, this is a great lock in my mind.
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I guess they finally fixed the clamp problem, because I was able to use it the intended way. I only use the clamp when I don't have my backpack on me, so I can't speak for longevity. It does seem to be sturdy, though. The barrel turns freely when I operate the lock, given that you've inserted the key properly. No issues there. My model looks slightly different than the one pictured, and came with longer oval keys that have a solid feel to them. The lock itself is relatively heavy but that's to be expected. MUCH better than the Wally World locks. I feel confident leaving my bike alone with this lock, however, I do live in an area where bikes are not stolen that often, and I also never leave my bike for periods longer than 2-3 hours. You may want a stronger one if you live in a bigger city or leave your bike outside. ALWAYS ALWAYS ALWAYS pair a U-lock with a chain or wire lock with a separate padlock when leaving your bike for extended periods of time. I cannot begin to describe the way people at my university lock their bikes up. Despite having decent locks, they somehow manage to make it scream "PLEASE STEAL ME". Please don't be careless; you're the only one that will get burned from it. This lock is definitely worth the price. Very satisfied!
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