How To Break a Kryptonite Keeper Bike Lock
 

My college senior lost both keys to her bike lock and the lock is through the frame of the bike and the wheel. Is a Kryptonite "Keeper" lock with a slot, not a round key. Did a google search and the old ones apparently could be opened with a Bic pen body, not this one. I've got to cut the hardened steel, any suggestions?

Liquid Nitrogen and a hammer... Don;t know how to get those open.

I am not familiar with the name brand... Is it a standard single side key lock? If so, it can easily be picked. If it is a double side key, it would take a little more work, but can still be picked by a decent locksmith.

-Nick

A dremel tool and a cutting wheel do it fine, or like Dave said, liquid nitrogen and a hammer.

I would use a die grinder or something with a 4" or larger cut off wheel. Would be through that in about 30 seconds.

Not everyone has liquid N on hand. Any grinding disc will go through it like butter. The thinner the disc, the better. Even a Dremmel will work.

Thanks guys, I'll try the dremmel since I own one.

Angle grinder?

What?!? Doesn't everyone keep a gallon in the freezer? :p

MacGyver would have used a pipe, some magnesium shavings made from his trusty Swiss Army pocket knife (from a ten speed racing bike that just happens to be lying around) and a flint striker to ignite the mag.

Liquid nitrogen is cheaper than milk. And it doesn't make the Cherrios soggy.

Yeah, but it gives you a nasty case of brain-freeze :D

they sell liquid nitrogen over the counter for warts, surprisingly enough. They can also be defeated with a scissor jack

Warts can be defeated with a scissor jack????

You really have to explain this to us!

;)

ooops:confused:

My portable acetylene torch defeats almost all locks.

... and warts.

+1 on Tobra's idea for a car jack. Either a scissors jack or bottle jack, between the U-shaped arms of the bike lock. Never done it myself, but have heard that this works.

A dremel sounds like a lot of work. A 4" angle grinder with a cut-off disc will be much quicker. 1/32" thick is best...as Milt mentions.

For portability one can buy cutoff discs with arbor so it can be chucked into a portable drill.

I'm with rick, I can't imagine how long that would take, and how many of those tiny Dremel cutoff discs you'd go through, trying to cut a hardened steel Kryptonite style lock with a Dremel.

I tried to manufacture a new trigger for one of my paintball guns from 1/8" mild steel plate with a Dremel. It took me two weeks and two packages (40 in all) cutoff discs.

I got my angle grinder w/ cutoff disc for $15 from Menard's. For as often as I use is (1-2 times a year), it's the right price.

I noticed that alot of the TV fabricators use a an electric angle grinder/cutoff disc combo to cut sheet metal. I find that the electric AG has quite a bit of gyroscopic pull and is sometimes difficult to handle. For sheet metal I much prefer a pneumatic cuttoff.

Liquid Nitrogen is clearly the FUN way to do it. Take a video for us.

Padlocks are so easy to pick it's stupid. You don't even need to really "pick" them, just apply turning torque to the cylinder and rake the pins with a wavy wire.

Easy as pie.

I'm pretty good wth tools usually, but I have always been powerless against those Kryptonite locks.

Dremmel tool and cutoff disk for hardened steel, 30 seconds and it was off, thanks guys.:)

Phew. That makes me feel safe. :rolleyes:
Maybe I can start using about 10 of 'em on each bike/motorcycle I own. Make the thief work for at least 5 minutes to steal the thing.

You just need to wear lead gloves

The trick is to get the jack between the wart and the basement membrane, otherwise you leave a scar

http://www.pelicanparts.com/support/...shockwhore.gif

reciprocating saw w/ carbide blade, then if someone gives you any shlt when your stealing (getting your daughter's bike free) just turn the saw on them.

Do you have a pic of the disc you used??

I've never been able to cut anything harder than a paperclip (ok a very small bolt) with my Dremel, using discs like this:

http://www2.gpmd.com/image/d/drer1326.jpg

After reading your post, I did some searching. Did you use something like this?

http://www.hobbylinc.com/gr/dre/dre7117.jpg

The flat fiberglass cut-off wheels for a Dremel tool will go through hardened steel on a padlock like a hot knife through butter. Well, like butter with a lot of sparks shooting out. ;)

I don't have a picture handy, but the discs I'm talking about resemble a very flat 50 cent piece.

Here's a picture of the disc I use:

http://forums.pelicanparts.com/uploa...1174148182.jpg

The same disk that Denis (Speeder) used, worked great.