Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-08-07, 09:56 PM   #1
halo_six
Newbie
Thread Starter
 
Join Date: May 2007
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
halo_six is offline   Reply With Quote
Old 05-08-07, 09:58 PM   #2
mander
Senior Member
 
Join Date: Sep 2006
Location: Van BC
Bikes:
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
just freelock it. no need to buy a special lock.
mander is offline   Reply With Quote
Old 05-08-07, 10:14 PM   #3
mosplat
brooklyn bike rider
 
Join Date: Sep 2005
Location: brooklyn
Bikes: bmw park bike, tonic fab supernaut, chromag stylus, traitor ruben
Posts: 140
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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) handgun 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.
mosplat is offline   Reply With Quote
Old 05-09-07, 02:49 AM   #4
caoimhin
kevinindisguise
 
caoimhin's Avatar
 
Join Date: Jan 2005
Location: Valley of Hearts Delight, CA
Bikes:
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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??
caoimhin is offline   Reply With Quote
Old 05-09-07, 04:16 AM   #5
me thinkst
mofo
 
Join Date: Oct 2006
Bikes:
Posts: 152
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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...
me thinkst is offline   Reply With Quote
Old 05-09-07, 04:44 AM   #6
filtersweep
Senior Member
 
filtersweep's Avatar
 
Join Date: Mar 2004
Bikes:
Posts: 2,615
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
filtersweep is offline   Reply With Quote
Old 05-09-07, 05:47 AM   #7
Yoshi
Senior Member
 
Join Date: Nov 2004
Bikes:
Posts: 2,544
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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...
Yoshi is offline   Reply With Quote
Old 05-09-07, 06:04 AM   #8
clancy98
don't be so angry
 
clancy98's Avatar
 
Join Date: Sep 2004
Bikes:
Posts: 614
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
clancy98 is offline   Reply With Quote
Old 05-09-07, 06:11 AM   #9
dobber
Perineal Pressurized
 
dobber's Avatar
 
Join Date: Oct 2003
Location: In Ebritated
Bikes:
Posts: 6,557
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
__________________
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.
dobber is offline   Reply With Quote
Old 05-09-07, 06:48 AM   #10
Smorgasgeorge
pompous windbag
 
Smorgasgeorge's Avatar
 
Join Date: Oct 2005
Location: West Philly
Bikes:
Posts: 352
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
2 farad capacitor that discharges when someone connects a circuit on the seat. Patent pending.
Smorgasgeorge is offline   Reply With Quote
Old 05-09-07, 07:14 AM   #11
SyntaxPC
!Newbie, !Senior Member
 
SyntaxPC's Avatar
 
Join Date: May 2004
Location: Philadelphia, PA
Bikes: IRO Mark V Track Bike, 1976 Schwinn Sprint Fixed Gear Conversion, 1975 Alan Aluminum Lugged Road Bike, Cannondale Touring, GanWell Road
Posts: 246
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
SyntaxPC is offline   Reply With Quote
Old 05-09-07, 07:18 AM   #12
SyntaxPC
!Newbie, !Senior Member
 
SyntaxPC's Avatar
 
Join Date: May 2004
Location: Philadelphia, PA
Bikes: IRO Mark V Track Bike, 1976 Schwinn Sprint Fixed Gear Conversion, 1975 Alan Aluminum Lugged Road Bike, Cannondale Touring, GanWell Road
Posts: 246
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
SyntaxPC is offline   Reply With Quote
Old 05-09-07, 07:24 AM   #13
viper_04649
was fixed, now i am free
 
Join Date: Oct 2006
Location: Boston
Bikes: Royal H Rando, IRO Mark V Pro, Redline Monocog 29er
Posts: 148
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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!
viper_04649 is offline   Reply With Quote
Old 05-09-07, 07:32 AM   #14
HelluvaStella
NoGoSlow
 
HelluvaStella's Avatar
 
Join Date: Dec 2004
Location: Philly
Bikes: Stella fixy conversion, Trek 2300, Specialized Rock Hopper, Schwinn Collegiate 3, Mz Skorpion
Posts: 862
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
HelluvaStella is offline   Reply With Quote
Old 05-09-07, 08:12 AM   #15
johnprolly
prolly is not probably
 
johnprolly's Avatar
 
Join Date: Mar 2007
Location: brooklyn | NYC
Bikes:
Posts: 1,117
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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!
johnprolly is offline   Reply With Quote
Old 05-09-07, 08:33 AM   #16
dblock
i read this at work
 
dblock's Avatar
 
Join Date: Feb 2007
Location: LI, New York
Bikes: IRO BFSSFG group buy, 2007 tommaso trascinare road
Posts: 334
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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
dblock is offline   Reply With Quote
Old 05-09-07, 08:47 AM   #17
iamarapgod
via hiptop
 
Join Date: Dec 2006
Location: youngstown, oh
Bikes: wooden lightning, cyclepro conversion, varsity beater, nishiki conversion, fuji conversion
Posts: 321
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Smorgasgeorge
2 farad capacitor that discharges when someone connects a circuit on the seat. Patent pending.
virtual light?
iamarapgod is offline   Reply With Quote
Old 05-09-07, 08:57 AM   #18
666pack
tarck bike.com exile
 
666pack's Avatar
 
Join Date: Jul 2006
Location: lancaster, pennsylvania
Bikes: bfssfg iro--black.
Posts: 2,058
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
forget all those. my bike does double duty as a pipe bomb. whenever people to try steal it it just blows up. literally.
666pack is offline   Reply With Quote
Old 05-09-07, 09:13 AM   #19
thequickfix
fails just as quickly
 
thequickfix's Avatar
 
Join Date: Apr 2006
Location: two miles behind
Bikes:
Posts: 522
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
How about this?
thequickfix is offline   Reply With Quote
Old 05-09-07, 09:23 AM   #20
LóFarkas
LF for the accentdeprived
 
Join Date: May 2005
Location: Budapest, Hungary
Bikes:
Posts: 3,549
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
^ 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
LóFarkas is offline   Reply With Quote
Old 05-09-07, 09:27 AM   #21
666pack
tarck bike.com exile
 
666pack's Avatar
 
Join Date: Jul 2006
Location: lancaster, pennsylvania
Bikes: bfssfg iro--black.
Posts: 2,058
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
666pack is offline   Reply With Quote
Old 05-09-07, 10:34 AM   #22
LóFarkas
LF for the accentdeprived
 
Join Date: May 2005
Location: Budapest, Hungary
Bikes:
Posts: 3,549
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
LóFarkas is offline   Reply With Quote
Old 05-09-07, 11:23 AM   #23
HoraceLai
Senior Member
 
Join Date: Jun 2006
Bikes:
Posts: 114
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
HoraceLai is offline   Reply With Quote
Old 05-09-07, 11:42 AM   #24
Jonny Pockets
Senior Member
 
Jonny Pockets's Avatar
 
Join Date: Oct 2005
Location: Portland, Oregon, USA.
Bikes: Univega conversion and a Bianchi Pista.
Posts: 350
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Jonny Pockets is offline   Reply With Quote
Old 05-09-07, 02:25 PM   #25
fix
yeahh, becky
 
fix's Avatar
 
Join Date: Apr 2006
Location: DC
Bikes: 1990 Kotter Albuch, 2005 Empella Spaar Select Cross, 2007 Ridley Aedon
Posts: 1,395
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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
fix is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 10:03 AM.