Introduction: Unlock a Bike Lock

This is a quick way to unlock a numbered bike lock in case you forget your code. Being a forgetful person, I use this method quite a bit. It's quick and easy to do. In the video I used my dad's bike lock that I don't know the code for. Seriously, don't use this to steal bikes! Also, if you like this and it works for you please give me a good rating and a vote when the voting starts.


poppa50 (author)2017-02-25

video did not load tried several times

Skwurlito (author)2015-02-22

I found out as a teenager that with a pocket screwdriver or knife and lots of light you spread the numbers apart and see where the notches are. also it took me thirty minutes to put in every possible combination of numbers. I kept going after I found the combo so I'd know. practiced on an old bike lock I replaced with a heavy kryptonite lock.

gdkush69 (author)2012-10-25

is there another video

llamah (author)2012-04-15

Can you add pics to it? YouTube isn't avalible where I am at…

finton (author)2011-06-25

So 6141 is your code; what was your home address again?... ;]

videogamemaster (author)2011-05-28

YES!!!! I can finally unlock the bike lock that I stuck under the seat of my bike and it got stuck there for years 'cause I forgot the combo.

bumsugger (author)2011-04-15

A bit more light on the subject in question would be a (great) help.............

clatterclatterbenz (author)2011-04-10

worked like a stinkin champ on a sweet cannondale goodwill special! :)

internethotspot (author)2011-04-04

It does work, but it's difficult to explain the technique. Another thing is, when you get each code correct, it will allow it to pull apart a very time bit, and if you shine a light between the dials, you will most often see a tiny notch indicating it is lined up. Not always the case, but often is the case. I had a job in the past that required me to open locks, including these type, and suitcase locks that worked the same way. Never failed me.

Patented (author)2009-08-15

Does not work on my lock..

Gjdj3 (author)Patented2009-08-16

:( Sorry. Now that's 2 people it hasn't worked for. It looks like it doesn't work as well on newer locks.

mrlunna13 (author)Gjdj32010-05-28

Did not work on mine either!

kingkruel (author)2010-04-02

another thing u could do is pull the lock, with slight tesion then twist the numbers, when u hear a click u know u got the right number!

Jasf316 (author)2010-01-03

Good video, now I can get the ones in my garage open.

zascecs (author)2009-09-14

I hope no one i know watched this video,...
I voted, thanks...

Gjdj3 (author)zascecs2009-09-18

Haha thanks for the vote. Sorry I didn't respond very quickly, but my internet's been down.

zascecs (author)Gjdj32009-09-27

That OK, sorry I responded very quickly, 'cause i haven't been on instructables for a while..

Bartboy (author)2009-09-19

Voted! This could be handy........................ *Why can't I favourite this?

elizabeth (author)2009-09-14

Great job! I love this! And yep, I sure did vote for you! Good luck. -elizabeth

Gjdj3 (author)elizabeth2009-09-18

Thanks for the vote! Sorry it took so long to respond, but my internet's been a little bit sketchy.

jackoteeny (author)2009-09-06

Hey great Instructable might I say! Keep up the good work!!

Gjdj3 (author)jackoteeny2009-09-10


realitymensch (author)2009-09-10

So which is the "first" dial?

Gjdj3 (author)realitymensch2009-09-10

The one furthest from the open end of the lock. Also, the one that is at the far left when you are reading the numbers.

maurice1993 (author)2009-09-03

hey, it REALY needs to be in the number one? becauses, in my view, can be in any number, as the pressure need to change them are the cause of the lock is being revealed... that's why I prefer the key locks....;-)

theseventhsage (author)2009-08-30

Please give any suggestion to the "Instructables the Movie" at

grundisimo (author)2009-08-29

could you summarize the video for me my computer doesn't show the video

Gjdj3 (author)grundisimo2009-08-29

Sure. First of all though, try using firefox. Okay, first set all of the numbers to one. Now, start pulling on the bike lock as you rotate the first dial. When the tension seems to increase, you have the right number. Repeat this for all of the dials and you get your code.

thrake (author)2009-08-28

Where's the video? I have two bikes lock in my garage and I need the vid!!

Gjdj3 (author)thrake2009-08-28

It's right up there. Try viewing the site in Firefox.

Kryptonite (author)2009-08-07

I desperately needed this!!! My combination lock is... well... forgotten. And I won't be getting a new one until I go through the 10 000 possible combinations. So, hopefully I can get this to work, but the lock's at another house so it may be another couple of days, or a week if I don't have the internet. I'll have my results up soon, thanks in advance!

Gjdj3 (author)Kryptonite2009-08-07

Cool! I hope it works out for you. I've never had any problem with this method, but some people have said it's more difficult (but not impossible) with some types of new locks.

Kryptonite (author)Gjdj32009-08-17

I appear to have lost it.... If I find it I'll post.

Pattytoboston (author)Kryptonite2009-08-07

i had two 3 digit locks i had to do that

chin_wu (author)2009-08-17

I'm voting for you

Gjdj3 (author)chin_wu2009-08-17

Thank you!

Skyfinity (author)2009-08-13

I do this all the time! I've found at least 7 locked but trashed bike locks over the years, and have used this method every time. You explanation was very succinct, and I think you described it well. From personal experience, this is something that is hard to describe. I have to say the video Quailty was rather poor (next time, don't stand in front of the light : ) but I think you made up for that in usefulness and explanation.

Gjdj3 (author)Skyfinity2009-08-14

Thank you! I had another light right behind the camera, but apparently it wasn't strong enough. Haha, the next video I make will be a lot better quality.

frollard (author)2009-08-06

Great concept for the 30 second video. Really poor recording (if I may), but great description. In the future, when you make a closeup video like this, do it in sunlight, or with as many lamps as possible aimed at you, not behind you - or we can't see exactly what it is you're doing! Awesome again! Sidenote - this is an INCREDIBLY bad idea to steal bikes, but an INCREDIBLY FUNNY PRANK to unlock someones bike (that you know), and move it to a different bike rack, (*within visual range) and re-lock it up. Person will go bonkers crazy thinking they left it somewhere else.

Gjdj3 (author)frollard2009-08-06

Thanks for the feedback! My means of recording are pretty limited (that's why I'd really like to win), but I think I got the point across of how to do this. And I love the prank idea! I'll have to try that out some time.

cgel1015 (author)Gjdj32009-08-13 This guy was only using a crappy webcam. Could be useful in the future!

Gjdj3 (author)cgel10152009-08-13

Yeah I saw that. I'm thinking about doing another entry and I'll definitely use his lighting tips if I do.

bigbodysmallbrain (author)2009-08-11

dosent work with mine x_x

Gjdj3 (author)bigbodysmallbrain2009-08-11

That's too bad. Just out of curiosity, how old is your lock?

bigbodysmallbrain (author)Gjdj32009-08-12

3 to 4 months old why?

Gjdj3 (author)bigbodysmallbrain2009-08-12

That would explain it. I'm not sure how, but newer bike locks have been modified so that this doesn't work quite as well. It's still theoretically doable, but takes a lot more time.

JakeTobak (author)2009-08-06

I wish I knew this when I saw that Segway locked up to a sign post :P To everyone without a sense of humor, calm down I'm not a thief.

epizeuxis (author)JakeTobak2009-08-06


fordman15243 (author)epizeuxis2009-08-10

Don't forget rapist =]

Gjdj3 (author)JakeTobak2009-08-06

LOL! Anyone who locks their segway with a numbered lock deserves to have it stolen anyway (Just kidding, once again to those with no sense of humor).

About This Instructable




Bio: Music, chemistry, electronics, etc.
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