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@user48271
Hi guys I wanted some advice and thought that this is the best place to ask for it. This September I will be commuting to uni (UCL) and leaving the bike there for most of the working day. The area is reasonably secure and better than leaving the bike on the street or outside a station, but not as good as indoor storage. What I wanted to ask is what sort of second lock I should get. I already have the fah mini u lock but can only really lock it with the Sheldon Brown method. I know some here don't agree with it but I feel that with another strong lock any attempts at stealing the bike based on real or perceived weaknesses of the method wil be minimised. I think I can leave the lock(s) there so weight isn't a real issue.
With that in mind I have a couple of broad questions: is it better to buy another u lock or a chain? I've heard it said that two different locks are recommended to force the thieves to carry two different tools but I don't fully understand why that would be the case: grinders will kill just about anything and bolt croppers a fair amount. If I did buy a chain, it would probably be the Almax series III immobiliser. Would a 0.7m chain be enough to lock the front wheel, frame, and stand? Chains are more expensive than another U lock so the reasoning behind it has to be clear to me.