(352) Master Lock 8184D Disc Detainer Bike U-Lock

Bike locks should be strong to resist attack. The Master Lock 8184D disc detainer bike lock...well....isn't. The disc detainer lock is a good idea and is fairly difficult to pick, but the designers cheaped out on the locking mechanism. One or two good licks with a hammer pops these right open.

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[AdrianWeber]

Oh and by the way the BEST U Locks I have seen believe it or not is the Abus X-Plus Granit 54, the Power and the Extreme! These are still made in Germany and the quality is exceptional!!! I am uploading the video on the 54 right now, I do not have the Extreme yet since it costs like 150€+ but I will buy it one day!

[atfsgeoff]

I wanted to comment, I picked up this exact master lock several years ago for my roommate so he could lock up his bike outside his workplace. A lot of the reviews for this lock on amazon and other sites complain about the lock mechanism not working and binding up after being left out in the elements. This happened to my roommate too, but instead of being an idiot and twisting the key off in the lock, he just squirted some light oil into it and it freed right up. The U-lock works perfectly to this day.

[ghffrsfygdhfjkjiysdz]

LOL I love it how you did not even try to pick it; went straight for the hammer.

[karenkoenig]

You just shattered my confidence in this product.

[ryanthomas]

Thank you for this! I had this u lock locked to my bike for months and was able to get off after watching. Brute force for the win!

[ericday]

Adrian, I didnt mind at all. I thank you for the info and look forward to any extra I do you put out there.

[rogersmith]

It's nice to see that when a product from a company that you know to make a large majority of garbage actually tests to be "not the usual garbage", you give credit where credit's due!

[scienceobrien]

Thanks got the lock off my son's bike!

[waddac]

Now that is a big FECK OFF vice mate.... Oh, great bashing as well my friend

[cacophony]

why dont you do some krptonite ulocks?

[bjmulli]

Nice work bill just want to say I love your videos and I have learned a great deal from you thanks and keep'em comeing

[ericday]

Well in your defense Bill, smashing a masterlock with a hammer did look like ALOT of fun!!!

[AdrianWeber]

Hey bill well done video! What thieves do is they try to twist the U-Shackle with a crowbar or use a bolt cropper like the one you have used on the Commando Lock. The locking mechanism is the same Chinese disc cylinder than on my Untouchable padlock and the Kryptonite Fahgettaboutit lock I believe. Could keep one damaged lock for me so I can take the cylinder apart and take a look at it? This way I do not have to take apart one of my expensive locks. I do not need the shackle!

[wbmgr]

Their design would work better if the u part of the lock could stick out the bottom of the crossbar and instead of having a cutout in the rod which weakens the rod have a hardened toroidal nodule on the rod and inside the crossbar have a hardened latch that turns 90 degrees when locked to latch onto the toroid. Once locked if manufactured with decent tolerances that design would be very hard to break with a hammer if properly case hardened.

[bosnianbill]

I'm guessing you need it for securing a bicycle. I was in Performance Bike (a chain in the NE US) looking at the U-locks about a month ago. The OnGuard disc detainer models look AWESOME. Tough locks, hardened steel components, and rubber weather covers. If I was in the market I'd take a serious look at them.

[Riyame]

Hmmm, I wonder how well a hydraulic jack would work for a slower albeit more quiet entry. Would the slow force eventually shear off the locking tabs or just bend the shackle?

[MotorheadRedo]

Were you ever able to pick this lock open? I am guessing no, since I couldn't find a video of you picking this lock.

[MatthewRayFlicks]

Bill, I have done a ton of research on locks and have been watching your videos for months. I realize you are one of very few people who can get past locks of the caliber of the challenge locks you receive, but it seems picking is the least common method of opening a lock for theft. I have been the victim of bicycle theft by thieves who bolt cut/hammer the locks, chains, and cables I have used. While I know there is no lock & chain that will PREVENT theft, based on the experience you have had with all of the locks you test: what lock/chain/cable situation do you recommend for minimizing theft of a bicycle from a public bike rack?

Thanks!

[waynefong]

Hilarious .. The professional Beat-Box subscriber request appeal .. The cat is not impressed .. !!

[AleksejsZz]

What if you ground off the schakle's sharp edge? Make it a bit roundish. Would it make less wulnerable to shearing?