氪石自行车锁拉动块扣件

Kryptonite bike lock tugblock buckle

2024-01-09 10:03:33

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Summary

Replacement tugblock buckle for the Kryptonite Transit FlexFrame U-Bracket bike lock frame mount. Useful if you lost the tugblock (metal buckle) and nylon strap at 0:34 in https://www.youtube.com/watch?v=lULcuifzxPs&t=0m34s (official installation video from KryptoniteLocks) but have the other parts.

Parts required:

Bracket body from the original Kryptonite mount (both pieces)
M4x20 bolt
M4x12x6 heat set insert
Zip ties 8" (2)

Installation instructions:

Insert the printed part into the bracket body, with the hole visible through the other end
Note: will be a tight fit, using a heatgun to soften up the part may be helpful
Insert the heat set insert into the hole by heating up with a soldering iron
Attach the other piece of the bracket body, and screw in the bolt - it should fit securely
Insert zip ties through the slits on the other end, and loop through your frame

See also other designs, and how this one differs:

Kryptonite bike lock holder - slides into the shackle instead, using no parts from the original mount. I tried this design first but found it limiting due to requiring an offset mount - the official FlexFrame mount supports many different positions, which are possible with my replacement tugblock - as long as you have the other parts.

Kryptonite lock adapter for bicycle rack - only interfaces with half of the bracket body (and is designed for a rack), vs mine which requires both pieces.

Notes:
The hole is sized to accept a brass heat set insert for a M4 bolt, not a bolt by itself. First design allowed threading the bolt directly into the plastic, but this wasn't secure enough in my testing. Using a threaded insert adds significant amounts of rigidity. YMMV.