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  1. #1
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    Locks that Prevent Motion

    I thought of this idea for a new bicycle lock. I call it a drivetrain lock (or drive lock for short). It designed to deter theft by eliminating the use of the bike as the getaway vechile.

    Basically you take a very small padlock (like a luggage lock) and attach it to your bike's chain. On a single-speed it will flip the chain off the bike. On a geared bike it will lock up the rear derailleur.

    Of course, I don't want to advocate people lock their bikes carelessly. There are only a few limited situations where it is useful:

    1. For messenger use or errands. For all those times when you have to leave your bike within site but unlocked.
    2. If you put your bike on the front rack of a city bus. Use a drive lock first, and it will stop the "grab and ride" thefts of opportunity.
    3. It also makes a pretty good supplementary deterrent for short-term use. Like if you only have a cable lock and need to stop in a store for a few minutes.

    There's some obvious disadvantages with this type of lock- people can still pick up the bike and walk off with it, it has the potential to damage your components (particularly on a geared bike), and it can be easily defeated with bolt cutters.

    I still like the idea of a lock that prevents a bike from being ridden. In Japan they use the O-lock for this purpose. I'm sure there are other variations on the concept.

  2. #2
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    just freelock it. no need to buy a special lock.

  3. #3
    brooklyn bike rider
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    if you only lock the drivetrain a thief could still coast away.

    when i was at school i'd bring the bike into the art building and use a (free from walmart) ******* barrel lock to freeze the rear wheel for the improbable but still possible opportunists.
    cheap, lightweight, and for low-risk areas only.
    and you can do that with any type of lock.

  4. #4
    kevinindisguise caoimhin's Avatar
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    Removable pedals! You heard it here first; and in other news, your bike might still get stolen. Such is life.

    Saddle spikes only you know how to disable??
    "Why is it called autoerotic if there are no cars involved?

  5. #5
    mofo
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    you already asked this in the commuting forum. double posting is lame.
    your basic idea of a mallwart tiny padlock on a SS chain would easily be defeated by either picking up the bike and walking away, or, by simply riding it- SS drivetrains can probably cut through your wussy lock, as they do sticks, squirrels, bones, fingers...

  6. #6
    Senior Member filtersweep's Avatar
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    I have seen only a gazillion bikes that lock the rear wheel beneath the seat with a pin or a half handcuff style lock. You can't coast away on these either. They look silly..... but most of the bikes that have them are so heavy it would take a crane to lift.

  7. #7
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    Not only could you coast away, you could just break the chain, remove the lock and then reattach the chain.

    Although I guess this method isn't aimed at stopping the type of thief who carries a chain breaker with them...

  8. #8
    don't be so angry clancy98's Avatar
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    Personally, I just ride a fixed. Then if someone steals it and tries to ride away, I just go pick it up by where they were thrown off.
    Irregardless is not a word, and you do not sound more intelligent using it.

  9. #9
    Perineal Pressurized dobber's Avatar
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    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  10. #10
    pompous windbag Smorgasgeorge's Avatar
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    2 farad capacitor that discharges when someone connects a circuit on the seat. Patent pending.

  11. #11
    !Newbie, !Senior Member SyntaxPC's Avatar
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    When I was in the Netherlands almost all of the cheap utilitarian city bikes (i.e. 95% of the bikes I saw while there) had a locking mechanism brazed onto the seat tube that would lock around the rear wheel. This is essentially like a free-locking mechanism built into the frame: the lock would prevent the rear wheel from spinning. Those things were so heavy that I doubt anyone would want to run away with one over their shoulder, though.

  12. #12
    !Newbie, !Senior Member SyntaxPC's Avatar
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    Here's a picture of one:



    Upon closer inspection, it looks like it just bolts into the rear brake mount. Most of those bikes have coaster brakes, so the rear brake mount is usually free.

    halo_six: if you're really looking for a free-lock like the one you've described, I'd first try finding one of these brake-mounted locks because chances are (given that you're reading this forum) your rear brake mount is under utilized.

  13. #13
    was fixed, now i am free
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    we could just leave then on an electric fence! or/and cover the frame with super tacky stuff so when they grab on, they can't let go!

  14. #14
    NoGoSlow HelluvaStella's Avatar
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    Quote Originally Posted by Smorgasgeorge
    2 farad capacitor that discharges when someone connects a circuit on the seat. Patent pending.
    Freakin' genius. I commend you, sir, on your deviousness paired with electrical know-how.
    Quote Originally Posted by crushkilldstroy View Post
    I'm Irish. I'd get in a fight over a lukewarm coffee or an untied shoe.

  15. #15
    prolly is not probably johnprolly's Avatar
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    Quote Originally Posted by SyntaxPC
    Here's a picture of one:



    Upon closer inspection, it looks like it just bolts into the rear brake mount. Most of those bikes have coaster brakes, so the rear brake mount is usually free.

    halo_six: if you're really looking for a free-lock like the one you've described, I'd first try finding one of these brake-mounted locks because chances are (given that you're reading this forum) your rear brake mount is under utilized.
    Yeah, in Holland that's what we used. That and 50lb bikes!

  16. #16
    i read this at work dblock's Avatar
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    Quote Originally Posted by caoimhin
    Saddle spikes only you know how to disable??
    or handlebars that shoot out spikes if they aren't your fingerprints. like Blade's sword

  17. #17
    via hiptop
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    Quote Originally Posted by Smorgasgeorge
    2 farad capacitor that discharges when someone connects a circuit on the seat. Patent pending.
    virtual light?
    this bike is a pipecleaner

  18. #18
    tarck bike.com exile 666pack's Avatar
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    forget all those. my bike does double duty as a pipe bomb. whenever people to try steal it it just blows up. literally.

  19. #19
    fails just as quickly thequickfix's Avatar
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    How about this?

  20. #20
    LF for the accentdeprived
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    ^ By locking the rear wheel to the frame you'd achieve a couple of things:
    -Your lock job wouldn't look ********
    -Your rear wheel would be better protected
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

  21. #21
    tarck bike.com exile 666pack's Avatar
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    i actually really like that method.
    i'm wondering if with a regular size u-lock you can probably make it through the chainring, chainstay AND the wheel.

    i'm gonna try that.

  22. #22
    LF for the accentdeprived
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    Yes if the chainring has big enough holes in the right area.
    Only, a regular size U-lock will take the chainstays (thus including the rear wheel) and a signpost/parking meter, and locking that way is about 12346518237465 times better than freelocking.
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

  23. #23
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    I was reading a bit about the forgetaboutit lock and it seems like the only way to defeat those is with a cut off wheel. So maybe if you somehow encase some gel on top of the surface of the lock it will be truly invincible.

  24. #24
    Senior Member Jonny Pockets's Avatar
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  25. #25
    fix
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    yeahh, becky fix's Avatar
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    Quote Originally Posted by LóFarkas
    ^ By locking the rear wheel to the frame you'd achieve a couple of things:
    -Your lock job wouldn't look ********
    -Your rear wheel would be better protected
    -you wouldn't have to bend over so damn far
    soh-CAh-T-oa-meter 0 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ X ~ ~ pi

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