Have an old bike combination lock that you can't remember the code for? If it's a simply four-digit cable lock, you can easily figure out the combination with a quick peck-and-go method. Crack a Combination Bike Lock in Under 30 Seconds By h77idz11; 2/22/17 11:09 AM. Then maybe you should just upgrade to a stronger lock anyway (remember. This will be usueful for people who may have lost/forgotten the combination to their bike lock. Or like in my case, buy a used bike with a lock attached. Please don't use this for any illegal. In this Article: Article Summary Cracking the Code Creating a Shim Using the Serial Number Community Q&A 10 References Combination locks are used for a variety of purposes, from school and gym lockers to securing items within the home.
My brother's friend found my 6ft On Guard cable lock and promptly reset the combination to something he was too lazy to remember. so I cam up with this method to find the lost combination and save the world (my world)
This is the semi-hard way. it's not the exhaustion method (trying every possibility) but it takes a little brain power and reasoning.
I know there's a lot of stuff on line about how to unlock a cable lock but these methods only work for the drug-store variety of locks that have low tolerances and a lot of wiggle room. (i'll explain why later) This one works on the nicer kind. the ones that have half inch braided cables and much tighter tolerances.
Footnotes:
Don't try to use this to steal a bike. It won't work. you can't put enough tension in the system to feel the shape of the disc using your muscles while rotating the tumblers. If that's your reason for being here, kindly piss off.
Edit (2014): I have since retired this lock. After moving to the Roger's park 'hood of Chicago, it has become rapidly apparent that cable locks are not only easy to crack but easy to cut. Kryptonite's higher-end locks still prove to be beyond my ability to crack. their tolerances are tight making the lock seize under tension. the only way to open one seems to be through exhaustion. anyone good with arduino want to make a robot?
I now use a keyed on-guard U-lock.
Stuck Kryptonite Combination Bike Lock
A combination lock (using a bike lock as an example as shown in the pictures above) has three or more dials with a keyhole through the centre of them. When correct code (in this case 9-2-4) is entered the keyholes of all the dials on the lock become aligned and toothed pin (second picture) can be inserted. How To: Hack a combination lock with scissors & a soda can How To: Crack the combination on a combination lock with no math How To: Crack a Combination Bike Lock in Under 30 Seconds How To: Open a bedroom or bathroom door when you're locked out. If you ever forget the combination to your bike lock, here's how to open the lock—without any tools required. Crack a Combination Bike Lock in Under 30 Seconds. Melanie Pinola.