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Old 01-14-13, 08:34 AM   #1
torquewrenchles
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Kryptonite "Mini" Chain vs U-lock

Kryptonite U-lock (14mm round shackle, weight of 3.75 pounds) that doesn't easily go around the frame, back wheel, and rack:

http://www.kryptonitelock.com/Pages/...PNumber=999348


Kryptonite "mini chain" (10mm hex links, weight of 4.40 pounds) that does easily goes around the frame, back wheel, and rack:

http://www.kryptonitelock.com/Pages/...PNumber=000792


They both mysteriously have a security rating of "8", despite the chain being 10mm and the U-lock 14mm. Similar price.

The chain's made of "3t manganese steel" and has hexagonal links. Would that make it as hard to cut with bolt cutters as a 14mm round and merely "hardened" U-lock shackle?

Or do you think the chain would fall to the 2-foot bolt cutters that the petty criminals in my small city seem to favor, and the U-lock not?

Is that integrated lock on the chain bound to end up having some exploit? It says "Patent-pending end link design secures chain to hardened deadbolt eliminating critical vulnerability". Suggesting that the chain on the previous model could be pried off with a toothpick.

¯\_(ツ)_/¯
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Old 01-14-13, 10:40 AM   #2
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alot of good info here.

http://www.bikeforums.net/showthread...ommuting/page3

http://gizmodo.com/5922074/the-best-bike-lock
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Old 01-14-13, 07:35 PM   #3
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The ulock looks very slim, easy for a theif to put something in the middle like a pipe and apply force. Happened to me before.
I suggest you get the Kryptonite new york noose. security rating of 10. around 50$. made of magnesium and NOTHING will break it. used to lock my 700$ bike.
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Old 01-14-13, 07:55 PM   #4
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You are going to limit what you have to lock onto with short chains and U locks..

& I dont know anything about the places you park.

how will you carry your lock?

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made of magnesium and NOTHING will break it. used to lock my 700$ bike.
magnesium is a soft, light alloy that will catch fire..
I think you need to go study the periodic table again..
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Old 01-14-13, 08:04 PM   #5
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ipad autocorrect.
ment manganese
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Old 01-17-13, 04:07 AM   #6
torquewrenchles
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Thanks for the suggestions. Anyone have experience with the Kryptonite "Evolution Series 4 1055 Mini Integrated Chain", or with how strong 10mm chain links are vs thicker U-lock shackles?
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Old 01-21-13, 05:10 AM   #7
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No personal experience with that chain - but can tell you that manganese steel in one of the toughest materials in the world. The reason you don't see more of it is because the stuff is so @$&? hard to machine! Normally a plasma torch is used to cut it. The lock itself would be the 'weakest link' in that chain.

That is apparently the same type of chain used on the 'New York Chain' product. But a better lock ups the protection level to '9' in that product.

Last edited by Burton; 01-21-13 at 05:21 AM.
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Old 01-24-13, 08:40 AM   #8
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I am a little leery about that built-it lock. But the New York Chain links are thicker than the Evolution chain as well (14mm vs 10mm). My main concern is to be sure I'm getting above the threshold where the chain can be cut with 2-foot bolt clippers (with ground leverage) or 3-foot bolt clippers (without ground leverage).

Unfortunately the security ratings system is pretty much useless, because all that's tested is how many seconds it takes to cut through a locking system using power tools. E.g. one U-lock is rated "10" because it takes 3 minutes to cut through it with an angle grinder and another rated "8" because it takes 1.5 minutes to cut through it with an angle grinder. You don't get any info on what kinds of attacks it can totally withstand, maybe withstand, definitely not withstand.

Last edited by torquewrenchles; 01-24-13 at 08:55 AM.
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Old 01-24-13, 08:54 AM   #9
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Quote:
Originally Posted by Burton View Post
Normally a plasma torch is used to cut it.
http://www.youtube.com/watch?v=VC3hFr8p2ck

Not sure if any of those are manganese steel, but the first one shown is an Abus 10mm hexagonal, and the last is the Kryptonite Fahgettaboutit (16mm, round, "hardened") which has a Kryptonite rating of "10".
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Old 01-24-13, 10:11 AM   #10
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Quote:
Originally Posted by torquewrenchles View Post
http://www.youtube.com/watch?v=VC3hFr8p2ck

Not sure if any of those are manganese steel, but the first one shown is an Abus 10mm hexagonal, and the last is the Kryptonite Fahgettaboutit (16mm, round, "hardened") which has a Kryptonite rating of "10".
Yeah - security is a relative thing. But I'm also thinking that if anyone can carry and use a 5ft chain cutter in public - it probably wouldn't matter how fast they cut the chain. If bystanders will ignore him for 1 minute they'll ignore him all day. Inside and controlled access is the most effective security.

I think part of the risk is also related to what you own and where its parked. I regularly parked a BMW K1 in front of the street unlocked for years with no issues. On the other hand, one of my buddies had his Harly stolen from inside his private garage were it was locked with a chain - while he was asleep in the house! Apparently they picked the garage door lock and used a torch on the chain. The bike was less than a month so my impression is that the address, make and model were sourced at the dealership.

My comment about the plasma torch was regarding machining. Anything else us too hard on tools and less cost effective.
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Old 01-24-13, 10:36 AM   #11
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Quote:
Originally Posted by torquewrenchles View Post
My main concern is to be sure I'm getting above the threshold where the chain can be cut with 2-foot bolt clippers (with ground leverage) or 3-foot bolt clippers (without ground leverage).
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