Front Wheel Kryptonite Bike Lock Hack




Introduction: Front Wheel Kryptonite Bike Lock Hack

I had 2 kryptonite lock barrels that the U part was cut by some thieves with bolt cutters.

I trashed them, but then decided to keep them as evidence prints etc.

Had them laying around buried in my bike junkbox. I always loop my chain through the front wheel to prevent theft, in NYC I see plenty of bikes locked up missing one wheel.

So it occurred to me that I could use a kryptonite barrel if slightly modified.

Here are the results of my tinkering.

Step 1: Repurposing Kryptonite Lock Barrel

I decided the the easiest way to do it was to remove the brake posts from the front fork and replace them with modified bolts. I have disc brakes, so I didn't need the posts.

So I measured distance between brake posts and cut as needed.

The one on the left is the modified.

First I removed the plastic cover so i could reuse it.

Think I cut 1-3/4 inches from original barrel. I used a 4 inch grinder with a metal cutoff wheel.

Then you to cut a rectangular slot, do this after you figure out the bolt lock look at next step.

Step 2: Replace Brake Posts

Find bolt with head big enough to fit key side and when locked will not come out.

I used a bolt with a larger head on the opposite side, ended up grinding the both sides of the head

so the bolt is like a T, the images with the black bolt are T.

Being screws made it easy to adjust how snug the lock fit.

Step 3: Finishing Barrel Lock

After you have determined the distance of both bolt openings.

Mark and cut a rectangular slot for the T-bolt.

Again 4 inch grinder with metal cutting wheel, worked best for me.

Then cut plastic cover to size and reuse I used a box cutter.

Adjust bolt heights as needed.

Whoopie! no more looping chain through wheel.

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    5 Discussions


    1 year ago

    Pretty effective use of otherwise useless leftover lock parts. I carried a 14-pound CobraLinks armored cable lock for years living in NYC then San Francisco, then I found out about pinlocks, which use a semi-unique nut and driver combo to fasten the skewer to the frame. They are a bit pricey, especially if you spring for the better, German-made ones, but make moot having to lock up your wheels every time you lock your frame to something.


    3 years ago

    this is much better than the 3m chain i carry around


    4 years ago

    It would be great to see someone build a device to put the front brakes on when a bike thief got to a certain speed. Thinking of bike anti theft devices is a lot of fun.


    Reply 3 years ago

    haha or just diconnect your brakes and leave it unlocked at the top of a steep hill