Most helpful customer reviews
640 of 674 people found the following review helpful.
Best lock out there, good for big cities but heavy as a brick
I got my bicycle stolen the second time I locked it up in the city with a cable lock only, so I spent many hours researching locks to make sure it wouldn't happen again.
This lock is widely regarded as the most secure lock currently available, and weighs much less than the fahgettaboudit chain locks (which seem to be about equally secure). Mine weighs 4 lbs 6 oz, and to lock the tires I need to also use a 12 oz 4 foot Kryptonite cable lock. So the whole locking system is about 5 lbs, which is a lot.
The most important feature of this lock is the small size, which doesn't allow thieves to get their manual tools like levers or car jacks in to break it. The only known way of breaking this lock is to saw it by hand (at least a half hour of intense effort), or to use a powered angle grinder (probably at least 5 minutes). So most thieves would end up cutting through the frame of the bike if they really wanted it.
There are other small U locks that are also unbreakable except for lots of sawing or power tools, like the Kryptonite Evolution Mini, and the Onguard Mini U lock, but which weigh much less. I almost went with one of these because I hate to carry a lot of weight, and they may be good alternatives to this lock for most people.
I figure the bike theft scene is escalating with the thieves getting more and more sophisticated over time, so even though this is overkill now, it provides me peace of mind that I will be able to keep it for many years without having to worry about it becoming obsolete. And I have the peace of mind knowing that if my bike gets stolen again there was nothing I could have done to prevent it.
Be aware that this lock doesn't come with a mounting bracket, and there is no bracket available for it. I've found the best way to carry it on my bike is to thread it up through the top and side of the rear rack on my bike, but if you don't have a rear rack you'll need to either let it jangle around looped over the handlebars or carry it in a bag or big pocket, which can be uncomfortable.
The locking mechanism is very smooth; it's easy to insert the shackle onto the U, and it's easy to turn the key. This is a welcome improvement over all the cheap U locks I've owned which were fidgety to close.
Update after owning this lock for two years:
I still like it a lot. The weight has bent my rear rack a little so it now nestles just perfectly for rattle free tranport. I spray teflon lube on it every 6 months or so and the locking mechanism is still butter smooth, by far the smoothest U lock I've ever used.
The only annoyance is that the plastic rainguard that covers the keyhole was very flimsy and broke off after just a month or so, leaving sharp mounting rivets that scratched me a few times drawing blood before I got some pliers and pulled them off.
The theft guarantee had too many restrictions to be useful, so I didn't even register.
I also learned a bit more about how to protect the rest of my bicycle after spending three figures replacing a stolen seat and associated components. Search "Pitlocks USA" to find the best system for permanently locking your wheels, seat, and headset to the bike. It's worth the extra cost for the convenience, security, and weight savings of only needing the U lock. And for the other components here's a really cool way to secure them: get ball bearings that will just barely fit inside the allen sockets. Drip some candle wax into the allen sockets, and press the bearing in place before the wax dries. The bearing prevents allen keys from being insertable, and the wax makes it necessary to have a sharp pointy tool (and some time) to get the bearing out, which a thief might not have. This works well for securing brake and shifting systems, racks, handlebars, and crank arms to the bike. I used cable ties around the pedal wrench flats to make it difficult for wrenches to fit. I drilled and drove a screw into the plastic mounting bracket for my LED light and used a cable tie to make it difficult to remove.
With all the components secured to the bike, I no longer need a cable lock, and I can leave the bike on city streets for hours without worrying too much. Bike Security Nirvana!
158 of 164 people found the following review helpful.
TOUGH, WORKS WITH MASERLOCK MOUNT, SMALL
First impression : "This thing is HUGE, HEAVY, how am I ever going to mount this on my bike?"
Well, you CAN mount it. Use the Master Lock 8351D Smart Bracket. It works like a charm. You'll pay $4 on Amazon to buy the bracket. When you get it, take out the two screws from the shackle portion of the mount and throw them away. Then go to the hardware store and pay $1 for two M4 30mm bolts. If you use those to mount the hardware on the shackle, it works great. See my pictures, and more info on my review of the Master Lock 8351D Smart Bracket.
The lock itself is heavily reviewed on the web - no need for me to repeat that here. BUT seriously consider WHAT you are going to lock your bike to. You cannot use this on a lamp post, and I have great doubts about whether it will work on a parking meter -- the lock is just too small.
Check my uploaded images and you'll see the dimensions. I lock it to a very strong street sign at work, but it's a tight fit. You may want to measure your "fixed device" and bike frame and do the math before getting this, and make sure it will fit for you.
If I get to try this with a parking meter I'll update my review.
Highly recommended - but make sure to buy the mount, and check the size issue before you buy.
Well, 1 year later I still have not had occasion to lock this to a parking meter - but I seriously doubt it will work. The parking meters here are just too thick for this to get around. I always pick a secure street sign at my workplace, and the few other places where I regularly ride. This just snugly fits around the post on standard street signs. Please research that issue carefully before you buy - make sure you can verify that it can get around whatever you need at your workplace or park -- it is a SMALL U-lock, but a great one.
UPDATE 8/2/16 - six years later.
By the way, my mount setup [Master Lock 8351D Smart Bracket.] 6 years later still is working without a hitch - that is definitely the way to go! slides right on the bike, and has never fallen off. And I've finally gotten around to getting a few pics showing the lock at a large handrail at work (1.5" diameter pole), and a signpost that I use every day for my lockup.
812 of 897 people found the following review helpful. See all 506 customer reviews...
kryptonite fahgettaboudit Lock anti theft protection
By Thomas Cantello
purchased this lock after my bike was stolen, primarily due to $4500 antitheft protection that comes with lock. worth noting that my old bike was stolen while locked up with a heavy duty Krytonite chain lock.
Anyway, received the lock, seems solid enough, but was a disappointed after reading all of the various conditions and qualifications related to the anti theft protection, which basically renders the protection worthless. First of all, they only pay for the deductible for your insurance not for the replacement of your bike, so you need to have insurance in the first place for this to have any value. Secondly, you need to provide so much back up information: bike registration, bike receipt, lock receipt, etc where it makes it very cumbersome process to even apply for the protection in the first place. Then there is the rigourous post theft requirements: report teft to police within 72 hours, mail notice to Kryptonite within 7 days, report to insurance company. most of these aren't too bad, but the one thing that you need to do which is likely not possible is that you have to send them the broken lock. so if the thief just takes the lock, which they did in both instances where I had bikes stolen, you are out of luck. So basically colecting on the anti-theft protection requires that the thief is nice enough to leave the lock behind.
The moral of this story is that Krytonite's anti-theft protection offer is worthless and should not be a consideration in purchasing one of thier locks. as far as their locks being the best and most theft resistant available, not sure this is true given my past experience.