General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Bike Theft Mythbusters

Old 09-18-12, 11:41 PM
  #1  
Saving Hawaii
Senior Member
Thread Starter
 
Join Date: Oct 2008
Location: Chico, Cali
Posts: 541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Bike Theft Mythbusters

tl;dr: I've heard it said that a lock can be defeated using a typical road flare to cause lock failure. I tried that today on a rather weak lock and it failed, so rest easy.

I decided to try that today when a roommate's cable lock stopped working permanently locking his bike to our porch. We can't get a pair of bolt cutters so hopefully this thing isn't stolen overnight. Nice bike in a bad neighborhood.

My attempt to defeat the lock with a flare failed. There was substantial deformation of the cable but it did not fail with simple and direct heat application over a period of 10 minutes. Subsequent mechanical attempts with wire cutters and "forceful pulling" also failed.

The flare I used was not actually a typical road flare. It was a backfiring fusee. Very similar to a road flare but designed for lighting fires. This device burned hotter and faster than a regular road flare would have.
Saving Hawaii is offline  
Old 09-19-12, 10:00 AM
  #2  
arej00dazed
Senior Member
 
Join Date: May 2007
Posts: 350

Bikes: '09 Giant Boulder SE

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
try this: get a can of comp. air (comp. duster), hold upsidedown and unload the can on a lock, see if it'll shatter. Saw it on Burn Notice and have been wanting to try it.
arej00dazed is offline  
Old 09-19-12, 10:57 AM
  #3  
tagaproject6
Senior Member
 
tagaproject6's Avatar
 
Join Date: Aug 2009
Posts: 8,314

Bikes: Wilier Izoard XP (Record);Cinelli Xperience (Force);Specialized Allez (Rival);Bianchi Via Nirone 7 (Centaur); Colnago AC-R Disc;Colnago V1r Limited Edition;De Rosa King 3 Limited(Force 22);DeRosa Merak(Red):Pinarello Dogma 65.1 Hydro(Di2)

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 461 Post(s)
Liked 75 Times in 47 Posts
Originally Posted by arej00dazed View Post
try this: get a can of comp. air (comp. duster), hold upsidedown and unload the can on a lock, see if it'll shatter. Saw it on Burn Notice and have been wanting to try it.
"Burn Notice" isn't exactly a wealth of truthful information. And no, the can of compressed air will not be cold enough to shatter any lock.
tagaproject6 is offline  
Old 09-19-12, 11:56 AM
  #4  
AndreyT
Senior Member
 
AndreyT's Avatar
 
Join Date: Nov 2011
Location: CA
Posts: 295
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by tagaproject6 View Post
And no, the can of compressed air will not be cold enough to shatter any lock.
Not entirely accurate.

Firstly, it is not "compressed air" that is stored inside the can, but rather some liquid gas with boiling point of approximately -50 deg. C. The procedure is performed with inverted can, which makes the liquid gas to get ejected from the can in liquid form and then evaporate on the surface of the lock. Given enough cans, this will indeed cool the lock to the boiling temperature of the liquid gas, i.e. approximately -50 deg. C.

Secondly, the question is whether this temperature is sufficient to compromise the strength of the lock. It depends on the lock. The shackle of even the cheapest locks is usually made from steel that won't become brittle at -50 deg. C. However, the body of the lock and, sometimes, load-bearing parts of the locking mechanism are sometimes made from materials that do indeed become very brittle at that temperature. There quite a few videos on the Net of the locks whose bodies easily split in half after being cooled with liquid gas from "compressed air" can.

Although, to be fair, it is quite possible that such locks would shatter relatively easily without any additional cooling.
AndreyT is offline  
Old 09-19-12, 12:28 PM
  #5  
DieselDan
Senior Member
 
DieselDan's Avatar
 
Join Date: Mar 2003
Location: Beaufort, South Carolina, USA and surrounding islands.
Posts: 8,522

Bikes: Cannondale R500, Motobecane Messenger

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hammer and a cold chisel.
Impact hammer.
A/C refrigerant, aka Freon.
DieselDan is offline  
Old 09-19-12, 01:21 PM
  #6  
iconicflux
Fredly
 
Join Date: Jun 2010
Posts: 477

Bikes: Surly Long Haul Trucker w/ SRAM Rival, & 36H 38's, Late 70's Santana Tandem w/ Double Diamond frame

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
what kind of lock mechanism? padlock? combo?
iconicflux is offline  
Old 09-20-12, 10:41 AM
  #7  
arej00dazed
Senior Member
 
Join Date: May 2007
Posts: 350

Bikes: '09 Giant Boulder SE

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by tagaproject6 View Post
"Burn Notice" isn't exactly a wealth of truthful information. And no, the can of compressed air will not be cold enough to shatter any lock.
Have you ever shot your wife in the ass with an upsidedown can of compress air? Yeah, you'd remember if you did............................

It'll form ice crystals after a few second burst, so I can imagine how cold an entire can would be and I could very well see a lock break afterwards with a good smack of a hammer.
arej00dazed is offline  
Old 09-20-12, 11:08 AM
  #8  
GrandaddyBiker
Senior Member
 
GrandaddyBiker's Avatar
 
Join Date: May 2012
Location: South Carolina
Posts: 269
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
http://www.youtube.com/watch?v=9j4DqevlIRY
GrandaddyBiker is offline  
Old 09-20-12, 12:24 PM
  #9  
I-Like-To-Bike
Been Around Awhile
 
I-Like-To-Bike's Avatar
 
Join Date: Oct 2004
Location: Burlington Iowa
Posts: 27,732

Bikes: Vaterland and Ragazzi

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked 100 Times in 66 Posts
Originally Posted by arej00dazed View Post
Have you ever shot your wife in the ass with an upsidedown can of compress air? Yeah, you'd remember if you did............................

It'll form ice crystals after a few second burst, so I can imagine how cold an entire can would be and I could very well see a lock break afterwards with a good smack of a hammer.
What happens after you smack your wife on her frozen posterior after giving her this foreplay? Inquiring minds want to know.
I-Like-To-Bike is offline  
Old 09-20-12, 12:39 PM
  #10  
arej00dazed
Senior Member
 
Join Date: May 2007
Posts: 350

Bikes: '09 Giant Boulder SE

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by I-Like-To-Bike View Post
What happens after you smack your wife on her frozen posterior after giving her this foreplay? Inquiring minds want to know.
re-read the part "Yeah, you'd remember if you did............................"..........does that explain enough? I didn't think the cold would travel through denim, but it suuuure did!
arej00dazed is offline  
Old 09-20-12, 12:46 PM
  #11  
dougmc
Senior Member
 
dougmc's Avatar
 
Join Date: Jul 2008
Location: Austin, TX
Posts: 3,030

Bikes: Giant OCR2, Bridgestone RB-T, Bike-E, Vision R-40, Novara Safari

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by arej00dazed View Post
It'll form ice crystals after a few second burst, so I can imagine how cold an entire can would be and I could very well see a lock break afterwards with a good smack of a hammer.
As already said, it'll get down to about -50 degrees C -- but no colder, even if you use more cans.

The question is ... is the can even needed? You can typically break these locks with a hammer without freezing the lock, so it's not even clear that freezing the lock helps.
dougmc is offline  
Old 09-20-12, 01:11 PM
  #12  
tagaproject6
Senior Member
 
tagaproject6's Avatar
 
Join Date: Aug 2009
Posts: 8,314

Bikes: Wilier Izoard XP (Record);Cinelli Xperience (Force);Specialized Allez (Rival);Bianchi Via Nirone 7 (Centaur); Colnago AC-R Disc;Colnago V1r Limited Edition;De Rosa King 3 Limited(Force 22);DeRosa Merak(Red):Pinarello Dogma 65.1 Hydro(Di2)

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 461 Post(s)
Liked 75 Times in 47 Posts
Originally Posted by arej00dazed View Post
Have you ever shot your wife in the ass with an upsidedown can of compress air? Yeah, you'd remember if you did............................
No, but I did something to your mother once and SHE never forgot THAT!


Originally Posted by arej00dazed View Post
It'll form ice crystals after a few second burst, so I can imagine how cold an entire can would be and I could very well see a lock break afterwards with a good smack of a hammer.


If imagination is all you have, you still have nothing. Ice crystal forming on a surface of a material is not evidence of material degradation. Stop thinking that everything you see on TV is real. Your presumptions are very indicative of someone with an IQ below sea level. Try again
tagaproject6 is offline  
Old 09-20-12, 09:55 PM
  #13  
I-Like-To-Bike
Been Around Awhile
 
I-Like-To-Bike's Avatar
 
Join Date: Oct 2004
Location: Burlington Iowa
Posts: 27,732

Bikes: Vaterland and Ragazzi

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked 100 Times in 66 Posts
Originally Posted by arej00dazed View Post
re-read the part "Yeah, you'd remember if you did............................"..........does that explain enough? I didn't think the cold would travel through denim, but it suuuure did!
But I didn't do it, so I don't remember what your wife's response was; perhaps you can fill me in, then I promise to remember.
I-Like-To-Bike is offline  
Old 09-20-12, 10:09 PM
  #14  
iconicflux
Fredly
 
Join Date: Jun 2010
Posts: 477

Bikes: Surly Long Haul Trucker w/ SRAM Rival, & 36H 38's, Late 70's Santana Tandem w/ Double Diamond frame

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Pretty sure she'd say the noodle was not aldente.
iconicflux is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bikemig
Classic and Vintage Sales
14
07-19-17 09:37 AM
efrobert
Foo
68
07-30-07 09:14 PM
Figaro
Road Cycling
50
11-24-05 08:32 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.