Target TL081 Alarm Bicycle Lock - High Security 110dB Siren Alarmed Lock for Securing Bicycles, Bikes, Cycles - 2 Spare Battery Sets Included

Update: I was riding and the D- shackle came loose from the lock; I must have gone over a bump or off the curb and due it being on the forks, didn't notice that it had fallen off (since it's usually not something I worry about). I emailed the vendor, and they have been very helpful - they are sending me a replacement shackle, very pleased - no fuss.I have a 24" mountain bike, with a very thick frame - so, with fiddling, managed to attatch it to the front forks and put the lock through both forks spokes. This seems to be safe, but was fiddly to get tight and can be a pain to lock and unlock. Do check the measurements of your bike. Due to this, it's come loose before, and has withstood some battering, so it is well made and still works after a bit of a beating. It is now secured tightly, again, just fiddly having it on the forks as opposed to the frame.Pros:- Loud. Very loud.- Suitable level of sensitivity- Great opinion to have the alarm active or off- Nice colour, unusual product - admired by bicycle repair veterans so seems pretty good to meCons:- Fiddly- Not entirely universal for thicker frames

Even after almost one year it still p*sses me off to read your nag for a review, but:+ it's a great, tough and durable product with a loud noise+ extra keys+ extra batteries (many many)+ good instructions+ good design with turning the lock head around to active the alarmed versiononly cons are:- can't put the key in without a warning alarm?- incredibly slim...

This alarm lock seems to be quite good. Very loud alarm, sensitive, but haven't yet had a false alarm. I like the fact that reseve batteries are provided. Lock has been in use for 6 weeks without need to change batteries.Why only 3 stars, then? Well, the fitting mechanism leaves much room for improvement as it is very inflexible: The frame needs to have a precise diameter where this beast can be fitted at all. Too wide, and it won't fit, too narrow, and it won't fit either. There is no way the base can be adjusted to specific needs. This also means that there are only certain areas on your bike where you could fit it, if at all. The shackle is quite narrow, so doesn't usually fit over mudguards.If there would be any better / more adjustment possibilities (eg different sized metal straps to fit the base, thicker rubber bands longer screws to fit the base, or other simple mechanisms to change the shape of the base bay), this would be a perfect alarm lock.

I've always really liked the idea of having an alarm on my bike. I had one on an old bike that lasted for many years but sadly it broke and predictably then got stolen. It's no longer on the market.Having ordered this I headed the warnings from other reviews that the fitting onto the bike can be an issue if the tubes of your frame are larger than normal or unusual shapes (quite common on a lot of road bikes etc). There was only one place on my bike (medium size Boardman Hybrid Comp) that it would fit, see pictures. It was still a tight squeeze on my bike (I needed to turn the rubber strip vertical to make it fit) but was eventually quite firm. I have to say there is very little flexibility with positioning. Any higher up the frame and it wasn't possible to put the lock in its storage position (the lock is always fitted to the bike - see second picture). Any lower and it is close to fowling the front dérailleur. The fact that this lock is permanently fitted to the bike (which I assume is necessary to make it secure enough not to false alarm constantly) is the reason the lock is so small and restricted - if it was any bigger it would start to get in the way whilst you ride.I did have a chance to test out the alarm and yes it is loud and I am sure it would wake me if it suddenly started going off in the back yard. Hopefully a good deterrent to thieves too. When setting the alarm it will beep to confirm that you have set the alarm (good since you know the battery still works and that you haven't accidentally put it in the non-alarmed setting). The shackle is itself quite looses in the lock which allows movement. It is this movement which will set off the alarm if it is being tampered with. Although the lock is constructed very well I wouldn't rely on this as your primary lock - I don't think it would take long to cut. Where this is more useful is making a thief's life difficult whilst trying to cut any other locks on your bike (hopefully a hefty D Lock or chain lock).So why only 2 stars? Well after 2 rides, both less than a mile in dry weather the alarm has stopped working - although it's still functioning as a lock. I've checked the batteries (2 extra sets conveniently supplied with the lock) and this was not the cause. I'm really hoping that I've just been unlucky as I am returning the first one and plan on trying a second because I'm generally impressed with the concept and I can't find any better alarms on the market right now. However if a second one breaks in the next year I'm definitely coming back to make this a 1 star review.

Nothing like sensitive enough. I can arm the lock and wave it frantically around in the air at arm's length and it doesn't detect anything (no beeps, nothing). Thief would have the bike into a van and have driven home and the alarm would be happily silent not having detected anything. But mine was not faulty because tap a table and it detects it (and warning beeps, and it tap again, goes off, etc.). Just nothing like sensitive enough to let you know your bike's being stolen.complete waste of money.