Fazer Owners Club - Unofficial

Bikes, Hints'n'Tips => FZS600 Fazer => Topic started by: rlkat on 19 August 2017, 09:34:32 pm

Title: U-lock or Disc lock?
Post by: rlkat on 19 August 2017, 09:34:32 pm
Are there other brands of u-lock other than Yamaha that fit under the seat in the slots and clips or can anyone recommend a decent disc lock?


Cheers
Rob
Title: Re: U-lock or Disc lock?
Post by: mr self destruct on 19 August 2017, 10:39:02 pm
I've got an Oxford Boss that comes with a mounting bracket.
(https://s26.postimg.org/d822vw1w9/IMG_5347.jpg)
Title: Re: U-lock or Disc lock?
Post by: celticdog on 19 August 2017, 10:46:02 pm
Hi Rob I'm not a fan of disc locks as there's always the chance you forget it's on and ride off. Saying that the new ones come with a motion alarm. Lad I park next to uses an On-guard brute lock. It looks a decent piece of kit don't know how much he paid for it though. I'm a chain and lock man, I've got one at home one at work and a smaller one under the seat. Anythings better than nowt to try and stop or at least slow down the thieving little b*stards.
Title: Re: U-lock or Disc lock?
Post by: darrsi on 19 August 2017, 11:23:15 pm
 :agree
Was gonna say the same, they mean well but an accident waiting to happen.
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 20 August 2017, 05:43:48 am
In my city and country, they put bikes in a van. Disc lock does little to help prevent that. As well as the alarm. Tying the bike to some post does make them need to cut the cable/chain though. Having alarm at the same time does make it all a bit extra less comfortable. So they might just go for another, easier prey.

I wrote two articles on bicycle safety - but similar goes for motorcycles, only a chain can be a bit thicker if possible (12 mm).

How to lock it up:
http://www.bike.bikegremlin.com/2015/09/30/locking-a-bicycle/ (http://www.bike.bikegremlin.com/2015/09/30/locking-a-bicycle/)

How to tell if a lock is well built:
http://www.bike.bikegremlin.com/2015/09/23/bicycle-locks/ (http://www.bike.bikegremlin.com/2015/09/23/bicycle-locks/)
Title: Re: U-lock or Disc lock?
Post by: mr self destruct on 20 August 2017, 10:15:48 am
Hi Rob I'm not a fan of disc locks as there's always the chance you forget it's on and ride off. Saying that the new ones come with a motion alarm.
I know what you mean as I've done it a few times myself, which is why I like mine with the mounting bracket. If it's not in plain sight as I cock my leg over the bike, then it's on my rear sprocket.
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 21 August 2017, 08:29:36 am
There's a trick a friend used - he said it has worked for him - locking the bike with the front wheel against a post, or a wall, or some other obstacle and mounting the disc lock so that it is against the fork when the wheel is rotated backwards. That way it prevents the bike from moving/gaining momentum before the lock is removed.
Title: Re: U-lock or Disc lock?
Post by: rlkat on 21 August 2017, 08:48:38 pm
Thanks for the replies, guys. I think I'm going down the disc lock route. I'll get one of those luminous springy things that you tie to the grip to remind you to undo the lock.


 :thumbup
Title: Re: U-lock or Disc lock?
Post by: darrsi on 21 August 2017, 10:48:07 pm
There's a trick a friend used - he said it has worked for him - locking the bike with the front wheel against a post, or a wall, or some other obstacle and mounting the disc lock so that it is against the fork when the wheel is rotated backwards. That way it prevents the bike from moving/gaining momentum before the lock is removed.


It's a minor deterrent, but in the real world they'll just pick the bike up if they really want it.
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 22 August 2017, 10:06:41 am
There's a trick a friend used - he said it has worked for him - locking the bike with the front wheel against a post, or a wall, or some other obstacle and mounting the disc lock so that it is against the fork when the wheel is rotated backwards. That way it prevents the bike from moving/gaining momentum before the lock is removed.



It's a minor deterrent, but in the real world they'll just pick the bike up if they really want it.


http://foc-u.co.uk/index.php/topic,23101.msg266455.html#msg266455 (http://foc-u.co.uk/index.php/topic,23101.msg266455.html#msg266455)
Title: Re: U-lock or Disc lock?
Post by: F4celess on 30 August 2017, 11:19:20 am
Thanks for the replies, guys. I think I'm going down the disc lock route. I'll get one of those luminous springy things that you tie to the grip to remind you to undo the lock.


 :thumbup

EXACTLY! The solution is to use the luminous leash, that you then reach up to a lever, or somewhere along the side of the bike.
It also adds as an immediate visual deterrent, so the thieves eyeing up the bike, will see that leash from a distance.

Fitting onto the rear wheel is better if possible, as the rear wheel is much more difficult to get off (if they go to extreme measures to bypass the lock)!
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 01 September 2017, 05:50:29 am
Thanks for the replies, guys. I think I'm going down the disc lock route. I'll get one of those luminous springy things that you tie to the grip to remind you to undo the lock.


 :thumbup

Like it was said, most of them just toss the bike into a van, unless it is chained to some heavy/fixed object.

EXACTLY! The solution is to use the luminous leash, that you then reach up to a lever, or somewhere along the side of the bike.
It also adds as an immediate visual deterrent, so the thieves eyeing up the bike, will see that leash from a distance.

Fitting onto the rear wheel is better if possible, as the rear wheel is much more difficult to get off (if they go to extreme measures to bypass the lock)!
Title: Re: U-lock or Disc lock?
Post by: fazersharp on 01 September 2017, 11:38:08 am
If you have a permanent spot that you always use then take in a 19mm thick link chain and leave it padlocked there. I say leave it because its too heavy to take in and carry around every day 
Title: Re: U-lock or Disc lock?
Post by: slappy on 01 September 2017, 02:58:59 pm
If you have a permanent spot that you always use then take in a 19mm thick link chain and leave it padlocked there. I say leave it because its too heavy to take in and carry around every day


Thieves are wise to that, they see the chain and lock there with no bike and superglue / araldite or damage the lock so it will not work. You arrive at your usual spot to find the lock unusable and leave the bike with no chain locking it, just what the thieves want you to do, as you need to get to work on time, thieves come along and nick the now unchained bike.
Title: Re: U-lock or Disc lock?
Post by: fazersharp on 01 September 2017, 04:05:26 pm
If you have a permanent spot that you always use then take in a 19mm thick link chain and leave it padlocked there. I say leave it because its too heavy to take in and carry around every day


Thieves are wise to that, they see the chain and lock there with no bike and superglue / araldite or damage the lock so it will not work. You arrive at your usual spot to find the lock unusable and leave the bike with no chain locking it, just what the thieves want you to do, as you need to get to work on time, thieves come along and nick the now unchained bike.
Of course ----------- brilliant really from their point of view
Title: Re: U-lock or Disc lock?
Post by: GhostCat on 01 September 2017, 09:54:15 pm
I got an Abus Granit 37/60 disk lock, doesn't fit in the holder but I just chuck it under the seat. *just* fits around the disk, making it hard to attack

GC
Title: Re: U-lock or Disc lock?
Post by: Creaky on 18 September 2017, 08:19:12 pm
As a disc lock reminder: Cut a short piece of electrical flex and strip out the inner cables leaving just the outer housing. Slide this over your dic lock key. When parking the bike transfer the flex cover to your ignition key and use the disc lock key. When you return to the bike you have to remove the flex cover from your ignition key which should remind you to use the disc lock key!
Title: Re: U-lock or Disc lock?
Post by: darrsi on 18 September 2017, 09:12:52 pm
I have a heavy duty chain and padlock that sits fine under the seat.
Title: Re: U-lock or Disc lock?
Post by: Disorderlypunk on 19 September 2017, 10:39:36 am
i would choose depending on location
Down London - Disc lock, harder to cut than anything else out there (wankers more likely to cut the bike next to you with a chain)
Rural Home / council estate - Chain to something Solid, (more likely to be a van theft - as you would hear a grinder in use)
if you have the money there is also the tracking option - but we have fazers so prob not worth the cost
(£179 + Fitting +£100 per year subscription for a datatool = but i have heard off some interesting alternatives in the pipeline)

im not a fan of U-locks as they are solid linked so easier to cut (bar is easier to cut than moving chain) and hard to carry
a big and bulky chain can be worn like rambos bulletbelt and disc locks can fit in a pocket

UNDER NO EXCEPTION GET A THROTTLE LOCK THEY ARE USELESS

http://www.youtube.com/watch?v=Y1XKWhC_2R4 (http://www.youtube.com/watch?v=Y1XKWhC_2R4)
Title: Re: U-lock or Disc lock?
Post by: Kamikaze on 19 September 2017, 03:12:15 pm
what about these for trackers?
http://www.youtube.com/watch?v=7tp3EPru6bs (http://www.youtube.com/watch?v=7tp3EPru6bs)

the streetwise one is from maplins, but the tk star is available on amazon. i got mine for 20 quid delivered.fewpeople say they have set u issues with them but this guy shows over 3 parts, what to do to set it up and use.
Title: Re: U-lock or Disc lock?
Post by: F4celess on 19 September 2017, 03:26:10 pm
Another little tip, you can buy a THICKER length of Chain in the Hardware (DIY) stores, that come in plastic sheath, cheaper than a similar length "branded" motorcycle chain, from say Halfords or Amazon - which are likely more expensive plus the actual links are not as thick either.

Granted, you then need to buy a Padlock too. Get something beefy, pick and mix. :)
Title: Re: U-lock or Disc lock?
Post by: Disorderlypunk on 19 September 2017, 03:30:42 pm
that looks like a good size piece of kit - easily hidden aswell - im not looking into trackers just yet untill the fighter build is underway
- one of the big problems with them is the other half can track you at all times which might not be a good thing.
Title: Re: U-lock or Disc lock?
Post by: F4celess on 19 September 2017, 03:39:18 pm
that looks like a good size piece of kit - easily hidden aswell - im not looking into trackers just yet untill the fighter build is underway
- one of the big problems with them is the other half can track you at all times which might not be a good thing.

But aren't you in your garage (at home) most of the time anyway, recording reviews and build videos, for your Utube channel?  :lol  :thumbup
I'm the FOCCER whose been recently commenting on a few of your Vids. Great stuff mate, excellent content.
Title: Re: U-lock or Disc lock?
Post by: Kamikaze on 19 September 2017, 04:25:46 pm
that looks like a good size piece of kit - easily hidden aswell - im not looking into trackers just yet untill the fighter build is underway
- one of the big problems with them is the other half can track you at all times which might not be a good thing.

one of his videos mentions that. nt about his other half, but that you can limit the numbers that can interact with the device.

he had cold callers ringing, which get a message with the location on it and drain the credit so by limiting the numbers, only his own phone can acess it till he activates another number. say the cops, or a mate helping locate it whatever. ive not set mine up yet but hoping it works over here. malins sell them here so they must do.
Title: Re: U-lock or Disc lock?
Post by: Disorderlypunk on 19 September 2017, 06:30:29 pm
that looks like a good size piece of kit - easily hidden aswell - im not looking into trackers just yet untill the fighter build is underway
- one of the big problems with them is the other half can track you at all times which might not be a good thing.

But aren't you in your garage (at home) most of the time anyway, recording reviews and build videos, for your Utube channel?  :lol :thumbup
I'm the FOCCER whose been recently commenting on a few of your Vids. Great stuff mate, excellent content.


currently making a security related video on an unbeatable alarm system - its so good even i cant disarm it with my keyfob
so the last couple of days yes i have been at home totally traceable.
Title: Re: U-lock or Disc lock?
Post by: tommyardin on 19 September 2017, 07:04:12 pm
i would choose depending on location
Down London - Disc lock, harder to cut than anything else out there (wankers more likely to cut the bike next to you with a chain)
Rural Home / council estate - Chain to something Solid, (more likely to be a van theft - as you would hear a grinder in use)
if you have the money there is also the tracking option - but we have fazers so prob not worth the cost
(£179 + Fitting +£100 per year subscription for a datatool = but i have heard off some interesting alternatives in the pipeline)

im not a fan of U-locks as they are solid linked so easier to cut (bar is easier to cut than moving chain) and hard to carry
a big and bulky chain can be worn like rambos bulletbelt and disc locks can fit in a pocket

UNDER NO EXCEPTION GET A THROTTLE LOCK THEY ARE USELESS

[url]http://www.youtube.com/watch?v=Y1XKWhC_2R4[/url] ([url]http://www.youtube.com/watch?v=Y1XKWhC_2R4[/url])



If you want to nick a bike with one of these throttle/brake locks don't cut the line as the video suggests just undoing the bleed nipple 10mm spanner will do it, save buying a new line and fitting it.
Oops should not have said that.


Disc lock on the front wheel is a great option with a bright coloured springy land-yard around the front brake or clutch lever side handle bar grip, someone once suggested a disc lock on each disc, no point you only have to remove the wheel exactly the same process as with one disc lock.


Back it up with a chain and a BIG bright coloured good quality padlock on the rear wheel if its being left for any length of time, it doesn't really have to be a super heavy duty chain because it someone is going to cut it with a 18volt battery powered disk cutter they will whether it is a 8mm link or a 15mm link, but it is a visual deterrent to the little foc pigs who want to go joy riding. Make sure the chain is of a length that it cannot be laid on the ground as it is difficult to cut a hanging chain with a hammer and chisel. Always use the steering lock.
There is no way you will stop someone nicking your pride and joy if they are determined but you can make life difficult and that will stop the opportunist thief.     
Title: Re: U-lock or Disc lock?
Post by: Disorderlypunk on 19 September 2017, 08:13:02 pm
bleed nipple - bloody hell i didnt think of that
- does somebody have a checkerd past lol
Title: Re: U-lock or Disc lock?
Post by: fazersharp on 19 September 2017, 10:32:54 pm
I would never comment on the security measures here at Sharp hall other than to warn - look out for the poison blow darts and wild poisonous monkeys if you enter without first being invited   
Title: Re: U-lock or Disc lock?
Post by: Disorderlypunk on 19 September 2017, 10:40:06 pm
my security measures are simple
enter my premises and a naked man bearing a baseball bat will come running out at you !!!!


- i feel shouldnt tell you where i live, otherwise you will all be on my driveway laughing with cameras
Title: Re: U-lock or Disc lock?
Post by: fazersharp on 19 September 2017, 11:05:34 pm
my security measures are simple
enter my premises and a naked man bearing a baseball bat will come running out at you !!!!


- i feel shouldnt tell you where i live, otherwise you will all be on my driveway laughing with cameras
Should I be more scared of your nakedness or the big stiff piece of wood you are waving at me
Title: Re: U-lock or Disc lock?
Post by: Disorderlypunk on 20 September 2017, 12:46:41 am
dont forget the baseball bat now
Title: Re: U-lock or Disc lock?
Post by: F4celess on 20 September 2017, 08:43:47 am

...
currently making a security related video on an unbeatable alarm system - its so good even i cant disarm it with my keyfob
so the last couple of days yes i have been at home totally traceable.

Look forward to this.  8)
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 21 September 2017, 04:31:49 pm
Back it up with a chain and a BIG bright coloured good quality padlock on the rear wheel if its being left for any length of time, it doesn't really have to be a super heavy duty chain because it someone is going to cut it with a 18volt battery powered disk cutter they will whether it is a 8mm link or a 15mm link, but it is a visual deterrent to the little foc pigs who want to go joy riding. Make sure the chain is of a length that it cannot be laid on the ground as it is difficult to cut a hanging chain with a hammer and chisel. Always use the steering lock.
There is no way you will stop someone nicking your pride and joy if they are determined but you can make life difficult and that will stop the opportunist thief.   

In my knowledge and experience, there is a difference between an 8 and a 15 mm thick link. There is also difference between well hardened steel and cheaper, softer one.

The main breaking point, so to say, is about 12 mm of well hardened steel. From that thickness, it is very hard to cut it with tools that fit under one's jacket to stay invisible. Also, that is the thickness that requires more than a few seconds with a battery run angle grinder - so there will be more noise and light from all the grinding sparks (English term?  :/  ).

No useable system is 100% hack proof, but the goal is to make it more work and more risk for the thieves than the other bikes.

Of course, a garage is much better - out of sight, at least in my country.

Another good thing is being nice to the elderly. Those people NEVER sleep :)  and will always let you konw if they saw someone suspicios, or call you (or the police) if they hear some break&enter noise.

(https://i.imgur.com/3zoNLTf.jpg?fb)
Title: Re: U-lock or Disc lock?
Post by: celticdog on 21 September 2017, 11:58:09 pm
Back it up with a chain and a BIG bright coloured good quality padlock on the rear wheel if its being left for any length of time, it doesn't really have to be a super heavy duty chain because it someone is going to cut it with a 18volt battery powered disk cutter they will whether it is a 8mm link or a 15mm link, but it is a visual deterrent to the little foc pigs who want to go joy riding. Make sure the chain is of a length that it cannot be laid on the ground as it is difficult to cut a hanging chain with a hammer and chisel. Always use the steering lock.
There is no way you will stop someone nicking your pride and joy if they are determined but you can make life difficult and that will stop the opportunist thief.   

In my knowledge and experience, there is a difference between an 8 and a 15 mm thick link. There is also difference between well hardened steel and cheaper, softer one.

The main breaking point, so to say, is about 12 mm of well hardened steel. From that thickness, it is very hard to cut it with tools that fit under one's jacket to stay invisible. Also, that is the thickness that requires more than a few seconds with a battery run angle grinder - so there will be more noise and light from all the grinding sparks (English term?  :/  ).

No useable system is 100% hack proof, but the goal is to make it more work and more risk for the thieves than the other bikes.

Of course, a garage is much better - out of sight, at least in my country.

Another good thing is being nice to the elderly. Those people NEVER sleep :)  and will always let you konw if they saw someone suspicios, or call you (or the police) if they hear some break&enter noise.

(https://i.imgur.com/3zoNLTf.jpg?fb)



Yes and the young women of eastern Europe are very hot too!

Title: Re: U-lock or Disc lock?
Post by: fazersharp on 22 September 2017, 08:44:11 am
Back it up with a chain and a BIG bright coloured good quality padlock on the rear wheel if its being left for any length of time, it doesn't really have to be a super heavy duty chain because it someone is going to cut it with a 18volt battery powered disk cutter they will whether it is a 8mm link or a 15mm link, but it is a visual deterrent to the little foc pigs who want to go joy riding. Make sure the chain is of a length that it cannot be laid on the ground as it is difficult to cut a hanging chain with a hammer and chisel. Always use the steering lock.
There is no way you will stop someone nicking your pride and joy if they are determined but you can make life difficult and that will stop the opportunist thief.   

In my knowledge and experience, there is a difference between an 8 and a 15 mm thick link. There is also difference between well hardened steel and cheaper, softer one.

The main breaking point, so to say, is about 12 mm of well hardened steel. From that thickness, it is very hard to cut it with tools that fit under one's jacket to stay invisible. Also, that is the thickness that requires more than a few seconds with a battery run angle grinder - so there will be more noise and light from all the grinding sparks (English term?  :/  ).

No useable system is 100% hack proof, but the goal is to make it more work and more risk for the thieves than the other bikes.

Of course, a garage is much better - out of sight, at least in my country.

Another good thing is being nice to the elderly. Those people NEVER sleep :)  and will always let you konw if they saw someone suspicios, or call you (or the police) if they hear some break&enter noise.

(https://i.imgur.com/3zoNLTf.jpg?fb)



Yes and the young women of eastern Europe are very hot too!


A quick one on hardening from what I know is that its better to have just the case hardened because when a fully hardened link is cut with a 4foot bolt cropper the other link shatters from the energy so with a softer inside both sides of the link have to be cut. An 18/19 mm chain is too fat for the largest bolt croppers to get a purchase in the jaws to be able to cut, wich then only leaves other noisy methods   
Title: Re: U-lock or Disc lock?
Post by: tommyardin on 22 September 2017, 12:19:59 pm
Back it up with a chain and a BIG bright coloured good quality padlock on the rear wheel if its being left for any length of time, it doesn't really have to be a super heavy duty chain because it someone is going to cut it with a 18volt battery powered disk cutter they will whether it is a 8mm link or a 15mm link, but it is a visual deterrent to the little foc pigs who want to go joy riding. Make sure the chain is of a length that it cannot be laid on the ground as it is difficult to cut a hanging chain with a hammer and chisel. Always use the steering lock.
There is no way you will stop someone nicking your pride and joy if they are determined but you can make life difficult and that will stop the opportunist thief.   

In my knowledge and experience, there is a difference between an 8 and a 15 mm thick link. There is also difference between well hardened steel and cheaper, softer one.

The main breaking point, so to say, is about 12 mm of well hardened steel. From that thickness, it is very hard to cut it with tools that fit under one's jacket to stay invisible. Also, that is the thickness that requires more than a few seconds with a battery run angle grinder - so there will be more noise and light from all the grinding sparks (English term?  :/  ).

No useable system is 100% hack proof, but the goal is to make it more work and more risk for the thieves than the other bikes.

Of course, a garage is much better - out of sight, at least in my country.

Another good thing is being nice to the elderly. Those people NEVER sleep :)  and will always let you konw if they saw someone suspicios, or call you (or the police) if they hear some break&enter noise.

(https://i.imgur.com/3zoNLTf.jpg?fb)



Yes and the young women of eastern Europe are very hot too!


A quick one on hardening from what I know is that its better to have just the case hardened because when a fully hardened link is cut with a 4foot bolt cropper the other link shatters from the energy so with a softer inside both sides of the link have to be cut. An 18/19 mm chain is too fat for the largest bolt croppers to get a purchase in the jaws to be able to cut, wich then only leaves other noisy methods


That exactly right, that is why you do not need a really expensive chain, the cheaper case hardened chains are more resistant to bolt croppers for the very reason you state, and, a hardened and tempered chain  is more resistant to a disc cutter, but with the latest wafer thin steel cutting disks they remove a very small amount of metal, therefore they cut through so much quicker.
15 to 20 seconds will have you through a heavy duty hard chain, and as long as they have everything else in place for a quick get away before cutting the chain your are not going to be out the front door before your pride and joy disappears for ever 

Most of the scrots (Joy riding opportunists) that are going to pinch your bike are likely to be the cropper brigade and if it looks like too much of a challenge they more on.
The pros out there are going to get it what ever you do.
Just make it look as secure as you can and remember if you buy a 1 kilo heavy duty hardened and tempered chain you also have to carry the foccing thing with you. :rolleyes :eek
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 22 September 2017, 07:58:57 pm
For hardening - the chains without any case hardening are also easy to cut with bolt cutters.
The trick is optimal hardness. Something Abus gets quite right with their Granig X-plus series of chains, U-locks etc. Not sure about other brands, since very few of quality are imported / available in my country.
Title: Re: U-lock or Disc lock?
Post by: celticdog on 23 September 2017, 09:08:43 pm
For hardening - the chains without any case hardening are also easy to cut with bolt cutters.
The trick is optimal hardness. Something Abus gets quite right with their Granig X-plus series of chains, U-locks etc. Not sure about other brands, since very few of quality are imported / available in my country.

Nothing is really theft proof, given enough time. Materials that can't be cut relatively easily with a grinder and the proper disk/blade aren't going to be cheap, They're also very brittle and hard to work with, and/or extremely heavy. However good chain link design helps by making it difficult to get a good angle and purchase on the chain when cutting through it.


High carbon, high molybdenum steel is harder to cut with an angle grinder. The addition of carbide further wears  the blade, slowing progress. The problem with high strength is increased brittleness. You'd have to use a fairly thick cross section and design it in such a way that it would be difficult to strike with force or difficult to pry apart with a jack. Steel like this isn't cheap and is hard to work with than other steels. It's a trade off between being saw and grinder resistant but more vulnerable to cutting torch or impact force.


Making a chain that can't be cut with a diamond wheel on an angle grinder is a tall order. The paradox being in order to make a chain the metal must be workable, so the same means used to produce it can be used to defeat it, i.e. mechanical force and or heat. Buy the best you can afford.  :)
Title: Re: U-lock or Disc lock?
Post by: Slaninar on 24 September 2017, 07:36:59 am
For hardening - the chains without any case hardening are also easy to cut with bolt cutters.
The trick is optimal hardness. Something Abus gets quite right with their Granig X-plus series of chains, U-locks etc. Not sure about other brands, since very few of quality are imported / available in my country.

Nothing is really theft proof, given enough time. Materials that can't be cut relatively easily with a grinder and the proper disk/blade aren't going to be cheap, They're also very brittle and hard to work with, and/or extremely heavy. However good chain link design helps by making it difficult to get a good angle and purchase on the chain when cutting through it.


High carbon, high molybdenum steel is harder to cut with an angle grinder. The addition of carbide further wears  the blade, slowing progress. The problem with high strength is increased brittleness. You'd have to use a fairly thick cross section and design it in such a way that it would be difficult to strike with force or difficult to pry apart with a jack. Steel like this isn't cheap and is hard to work with than other steels. It's a trade off between being saw and grinder resistant but more vulnerable to cutting torch or impact force.


Making a chain that can't be cut with a diamond wheel on an angle grinder is a tall order. The paradox being in order to make a chain the metal must be workable, so the same means used to produce it can be used to defeat it, i.e. mechanical force and or heat. Buy the best you can afford.  :)

That is all correct. Good chains for locking (motor)bikes are usually hardened somewhere in between - not brittle enough to be easily broken with a hammer and a chisel, but not too soft to be easily cut with bolt cutters. Such chains do have a hardened core (as well as the outer part), just not hardened too much so it becomes brittle. Some cheaper chains have just the outer part hardened, so you can't tell how har to cut they are, until you actually try to cut them. Checking the outer aree of a link it feels and looks just as a thoroughly hardened chain.

Leaving a chain not lying on the ground (and making sure it's a tight fit), leaves the thieves without the luxury of using the ground as a leverage, or as an anvil for the hammer/break approach. For U-locks, that means not leaving room for a car jack to be inserted inside the U part of the lock (so too big is bad).

So, with a good quality chain with links of at least 10 mm (better at least 12 mm) cross section, hexagonally shaped (for a wider area in contact with bolt cutters), it takes very long and good quality bolt cutters (over 50 cm handle), placed against the ground with the body used as a leverage to cut the chain. And it usually needs to be done twice on one link. Or about 20 cm of cutting with a good hand saw with a decent quality blade. Or lots of noise and (relatively long) time with a battery powered angle grinder. This is often enough for the thieves to seek easier pray. Combine that with an alarm as a psychological detterent and bother during the work and, for the about 20 years old Fazer, you're pretty safe. Nothing beats a good garage, though (out of sight).

Making them work for it is the best one can do. If they were into working, they wouldn't be stealing, after all. Also, two good chains is better than one. Or a chain and a cable lock. Amount of work needed is crucial. As well as the amount of noise (and light if using an angle grinder in the dark) - thieves don't want to be heard/seen and caught.

The "extremely heavy" part:
Yes, steel weighs as much as it does. Many manufacturers of bicycle safety chains encase their chains in rubber, plastic, or nylon. So it's often not too easy to see just how thick a link is. When people ask me to see if their chain is any good, the first thing I do is just take it in my hands, holding it in the air. If they're not heavy, there's not a lot of metal used, so the cross section can't be very thick. One of the most often heard complaints when I hand people what I'd recommend to be a good chain/lock is not the price, but "oooh, it's too heavy!"  :)