Last updated at 04/09/2026 08:46:57
Kryptonite Keeper 12 Standard Heavy Duty Bicycle U-Lock with Bracket (4-Inch x 8-Inch)
Delivery $23.03
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Kryptonite Keeper 4x8"
Delivery between 5–17 Sept $27.73
originally posted on altitude-sports.com
I like these Krypto locks with the long shackle to lock my front wheel and frame to bike racks. This one is for my son. I should have tested it out as his wheel might be too far from the frame to work.The key feature for the Krypto locks for me is the locking mechanisms work well with the keys. I’ve used other brands and they are terrible.
originally posted on ebay.com
Really happy with this lock, great size and looks like it'd be incredibly tricky to pick. Comes with a lifetime warranty so the maker is confident their product is solid. For the price I honestly think this is the best bike lock you could get outside of buying a thick chain and padlock. Definitely recommend
originally posted on ebay.com
Kryptonite. Bike lock. Relativity cheap. Duh!!! Perfect for when you are mobile and need to lock up quick and easy. Extended frame gives you more attachment point options. Not heavy duty, just keeps the honest, honest! I would not recommend this product for extended time lock ups. Or out of someone's camera/eye site public site lock ups. If you have an expensive bike, you need to step up.
| Special Feature | Key Unlock |
| Lock Type | U-Lock |
| Item Dimensions LxWxH | 8.27 x 5.31 inches |
| Recommended Uses For Product | Security |
| Style | U-lock With Bracket |
Kryptonite Keeper 12 Standard Heavy Duty Bicycle U-Lock with Bracket (4-Inch x 8-Inch)
Delivery $23.03
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Kryptonite Keeper 4x8"
Delivery between 5–17 Sept $27.73
I like these Krypto locks with the long shackle to lock my front wheel and frame to bike racks. This one is for my son. I should have tested it out as his wheel might be too far from the frame to work.The key feature for the Krypto locks for me is the locking mechanisms work well with the keys. I’ve used other brands and they are terrible.
Really happy with this lock, great size and looks like it'd be incredibly tricky to pick. Comes with a lifetime warranty so the maker is confident their product is solid. For the price I honestly think this is the best bike lock you could get outside of buying a thick chain and padlock. Definitely recommend
Kryptonite. Bike lock. Relativity cheap. Duh!!! Perfect for when you are mobile and need to lock up quick and easy. Extended frame gives you more attachment point options. Not heavy duty, just keeps the honest, honest! I would not recommend this product for extended time lock ups. Or out of someone's camera/eye site public site lock ups. If you have an expensive bike, you need to step up.
It's a fine bikelock. I had a combo lock but it wasn't great; this one is a good entry level bike if you care about your bike and don't plan on leaving it anyway sketchy for an extended period of time. The rotating key entryway is icredibily annoying, but I'm gonna chalk that up to my inexperience with this kind of lock. The clamp for the bike feels really cheap and slides around everywhere, but it hasn't fallen off- tightening the screw can work to an extent. The strange thing is that, unless I don't understand how to use the clamp, you cannot clamp it to the underside of the top of the bike without interfering with the brakes. But I clamped it to the side of the bike and it works fine.
Kryptonite bike locks are excellent quality, durable locks, and the best quality locks on the market. They are the only bike locks I use. I know because I had to leave my bike outside for 3 days in an area that was undesirable. When I returned to my bike the lock had been sawed on and a little bent out of the original shape but, I am happy to say it did not break and I have my bike. Thank you.
Tredz always great to deal with but this product is garbage, and not in my first experience of this with kryptonite unfortunately. Firstly the lock seems robust and secure enough, if you can lock it. From very first opening the lock is sticky, it is hard to even fully get the key in and difficult to turn - this is alarming in a brand new product and indicative of a product that is highly likely to fail much sooner than it should. When you do manage to lock the bike, great all good and secure, but you might be hanging around fiddling with this for an annoying amount of time every day when it should be instant. Then you come to unlock the bike, you just want to quickly turn and go. Think again. Fumbling trying to get the lock to accept the key (brand new out the box), ... MoreTredz always great to deal with but this product is garbage, and not in my first experience of this with kryptonite unfortunately. Firstly the lock seems robust and secure enough, if you can lock it. From very first opening the lock is sticky, it is hard to even fully get the key in and difficult to turn - this is alarming in a brand new product and indicative of a product that is highly likely to fail much sooner than it should. When you do manage to lock the bike, great all good and secure, but you might be hanging around fiddling with this for an annoying amount of time every day when it should be instant. Then you come to unlock the bike, you just want to quickly turn and go. Think again. Fumbling trying to get the lock to accept the key (brand new out the box), then at long last hurrah its open, you take the open lock off the bike and think at last you can just quickly close it attach to frame and off you go? No. Think again. When you open the locked lock and then go to close it, it will not close, that's right, the key will turn enough to uinlock the lock, but the lock mechanism will still be in enough position to prevent it reclosing to fasten to frame and leave, so you have to get the key again and start fiddling . A frustrating lengthy process whiich should take seconds delays you for minutes. Every single time you use you bike. How can a company that professionally designs and produces locks not be capable of checking A. The key can smoothly access the lock (it can't) , B. the lock can freely turn and be easily opened and reclosed? (it can't) 20 years ago I had a great kryptonite lock, no issues. 5 years ago I got another of these and had to return to another major bike store, where the manager explained it was 'the design'. I asked him to demonstrate how the lock should be used, he confidently attached the lock, then desperately fumbled for 5 minutes getting increasingly embarrassed while trying unsuccessfully to unlock again, I took my refund and used a generic store brand which functioned infinitely better, albeit less robust.
All the good features you’d want: double shackle, long enough to fit most poles, thick vinyl covering to not scratch paint. Use in combination with a thicker smaller lock for better protection.
The lock is sturdy but difficult to unlock for me. The key has to be inserted fully and it seems to be obstructed. My husband can unlock it so it must be a design problem.
This lock will definitely not be cut by a pair of bolt cuters. Its long enough to hold 2 bikes together or one bike to a pole or rail. It's worth the price
I love the style and quality of my Thousand helmet --- I just ordered the Keeper U Lock and it is a fantastic add. Keeps everything together on my bike and I can lock it up and walk away without fear of anything getting stolen.
| Special Feature | Key Unlock |
| Lock Type | U-Lock |
| Item Dimensions LxWxH | 8.27 x 5.31 inches |
| Recommended Uses For Product | Security |
| Style | U-lock With Bracket |
About the Kryptonite Keeper The Kryptonite Keeper 12 Standard Lock is an affordable D lock for moderate crime areas. It has a 12mm hardened steel shackle with reinforced collar over keyway for increased protection. There is a high security disc style cylinder and a high security Bent Foot design. This affordable D lock includes side mount and snap-in bracket. The 2 stainless steel 'I' keys that are more ergonomic; reducing the amount of torque being applied, which stops them bending or breaking.
About the Kryptonite Keeper The Kryptonite Keeper 12 Standard Lock is an affordable D lock for moderate crime areas. It has a 12mm hardened steel shackle with reinforced collar over keyway for increased protection. There is a high security disc style cylinder and a high security Bent Foot design. This affordable D lock includes side mount and snap-in bracket. The 2 stainless steel 'I' keys that are more ergonomic; reducing the amount of torque being applied, which stops them bending or breaking.
in 2 offers
The lowest price for Kryptonite Keeper 4x8" right now is $42.04 at Amazon.com.au, compared across 2 retailers.
The all-time low was $32.43 on 30 Apr 2026 — today's price is 30% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 4 Sept 2026.
Kryptonite Keeper 4x8"
About the Kryptonite Keeper The Kryptonite Keeper 12 Standard Lock is an affordable D lock for moderate crime areas. It has a 12mm hardened steel shackle with reinforced collar over keyway for increased protection. There is a high security disc style cylinder and a high security Bent Foot design. This affordable D lock includes side mount and snap-in bracket. The 2 stainless steel 'I' keys that are more ergonomic; reducing the amount of torque being applied, which stops them bending or breaking.
About the Kryptonite Keeper The Kryptonite Keeper 12 Standard Lock is an affordable D lock for moderate crime areas. It has a 12mm hardened steel shackle with reinforced collar over keyway for increased protection. There is a high security disc style cylinder and a high security Bent Foot design. This affordable D lock includes side mount and snap-in bracket. The 2 stainless steel 'I' keys that are more ergonomic; reducing the amount of torque being applied, which stops them bending or breaking.
