Go Back  Bike Forums > Bike Forums > Commuting
Reload this Page >

Air jack to break U lock?

Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

Air jack to break U lock?

Old 03-04-12, 11:12 AM
  #1  
Winfried
Senior Member
Thread Starter
 
Winfried's Avatar
 
Join Date: Aug 2011
Location: Paris, France
Posts: 1,696
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Air jack to break U lock?

Hello

I heard about some compact air jack that can be used to break open U locks when there's enough space between the lock, the bike frame and whatever fixed point it's connected to.

But Google didn't return much infos. It mostly mentions using regular car jacks, which are probably too big for use to steal bikes.

I was just curious to see how compact those air jacks could be. Does someone have more info?

Thank you.
Winfried is offline  
Old 03-04-12, 12:00 PM
  #2  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,578

Bikes: 8

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 6741 Post(s)
Likes: 0
Liked 157 Times in 133 Posts
Think Hydraulic jack ... because fluids don't compress, air does,
its the space between the molecules.
so with air, the volume input needs to be great..
to raise the piston PSI.
are you planning a crime spree?
fietsbob is online now  
Old 03-04-12, 12:08 PM
  #3  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 18,125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 24 Times in 22 Posts
yeah, I'm guessing hydraulic bottle jack too. I was wondering about the crime spree, but I think the OP is concerned he's leaving too much room for the thief to use
unterhausen is offline  
Old 03-04-12, 12:50 PM
  #4  
TireLever-07
Senior Member
 
Join Date: Sep 2005
Location: Malden, MA.
Posts: 394

Bikes: 1994 Schwinn Passage, 2010 Masi, 2014 Specialized Crossroads

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I used to read to keep your padlock, etc off the ground so they can't use a lever, whatever device to cut through. I'd guess with the numbers of cordless power tools available that new crooks are working hard. Chris
TireLever-07 is offline  
Old 03-04-12, 03:19 PM
  #5  
MijnWraak
Noobie of the year :)
 
MijnWraak's Avatar
 
Join Date: Jul 2009
Location: Hour South of Boston
Posts: 287

Bikes: 1980's Miyata Seven Ten

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Any more than in inch of free space is too much in my opinion. Thats why I love that my work has very thick tubes on its' bike racks. Look for a mini-ulock instead of those huge ones as well. You may not be able to get it through your rear wheel and seat tube though, but I don't worry about it too much where I live.
MijnWraak is offline  
Old 03-04-12, 05:03 PM
  #6  
jsdavis
Senior Member
 
Join Date: Apr 2011
Posts: 1,289
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 46 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by fietsbob View Post
Think Hydraulic jack ... because fluids don't compress, air does,
its the space between the molecules.
so with air, the volume input needs to be great..
to raise the piston PSI.
are you planning a crime spree?
Some hydraulic jacks can be operated using an air compressor in addition to the handle.
jsdavis is offline  
Old 03-04-12, 06:12 PM
  #7  
IndianaShawn
Senior Member
 
Join Date: Feb 2012
Posts: 139
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This is the reason that the Kryptonite New York lock was developed from what I understand. The lock is too small for a jack to fit inside of the bar portion of the lock but the downside is that you also need the chain to lock it to something solid like a bicycle rack. See how small the lock is compared to the Mini 9. They call it mini because it isn't as wide as some other locks.....but its still 9 inches long to span the distance from bicycle to rack.
Attached Images
File Type: jpg
Locks 003.jpg (100.5 KB, 37 views)
IndianaShawn is offline  
Old 03-05-12, 06:07 AM
  #8  
Winfried
Senior Member
Thread Starter
 
Winfried's Avatar
 
Join Date: Aug 2011
Location: Paris, France
Posts: 1,696
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks guys for the feedback. No, I don't intend to steal bikes, just to avoid getting another one stolen ;-)

I guess only hardcore thieves carry hydraulic jacks.

I'll check really small U locks like Kryptonite's NY lock instead of bigger U locks, which is probably how my last bike got stolen (left too much space between lock, frame, fixed point).

BTW, does someone know what the dimensions mean, eg. "3.9 10.3 (10.3cm x 26.1cm)" for the New York Lock M18-WL? Before ordering it, I need to check the size of the inner space to check that it's big enough to connect the frame to a fixed point.
Winfried is offline  
Old 03-05-12, 07:40 AM
  #9  
Drago1010
Senior Member
 
Join Date: Aug 2009
Location: Chicago, IL
Posts: 57

Bikes: Spec Roubaix SL4 Comp Disc, Cannondale Synapse, Fuji Tread 1.0, Marin Larkspur, Trek 820

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The preferred tool of the urban bike thief is the cordless angle grinder.
By most accounts it takes less than 1 minute to cut thru a U lock.
Drago1010 is offline  
Old 03-05-12, 05:32 PM
  #10  
Winfried
Senior Member
Thread Starter
 
Winfried's Avatar
 
Join Date: Aug 2011
Location: Paris, France
Posts: 1,696
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
But then, there's nothing that can be done against cordless angle grinder, so I'll just do the best I can :-/
Winfried is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Odysseus32
Road Cycling
6
08-17-13 09:43 AM
Andysalter
Mountain Biking
3
05-08-11 02:31 PM
ghigg
Training & Nutrition
6
05-05-08 07:22 AM

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.