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@lpg
OK so i've had this for a week or so now. Quite pleased with it but it isn't perfect for a bicycle.
Strengths: Compact, lightweight, uncommon so it's a good deterrent, loud.
Weaknesses: Too sensitive.
I think this is the perfect extra lock for attaching to the bike if it's locked in a shared hallway overnight, or in a garage. For locking up on a busy bike rack, or on the street .. no. It's just too sensitive. Bump the bike once and it gives off five warning beeps, then immediately goes off for around 10 seconds. This is dumb. IMO, it should sound off a 'beep beep' warning first, like a car alarm, to give off the message that it's alarmed, so please back off. Then sound off. Not everyone that nudges a bicycle is planning to fuck with it, what if it's locked to a lamppost and some pedestrian grazes it, or it's locked to a packed bike rack and someone locks up next to yours?
It will also only fit on the 10/8 o clock position on my chainring, above and beneath the chainstays. I'm pretty sure it would fit 3/32 rings better than my 1/8 ring, as the disc lock alarm won't fit over my chain and ring together. Apparently, it's less sensitive if you lock it to the 6 o clock position, and more sensitive if you lock it in the 12 o clock position. I tried this on my motorbike but it made no perceptible difference..
So, not so great for locking up in public but perfect for using where you are certain your bike should remain still.