Oxford Boss disc lock

Used for: two years Price: £53 Info: oxprod.com This alarmed disc lock is the mainstay of Bike’s office security arsenal. Insert between disc and wheel hub, or use as a chain padlock. There’s a hefty 14mm diameter shackle, but a slightly subdued alarm tone that’s quick to cry wolf and gets quieter as batteries run down. Six replacement LR44S cost £5 or so online. We’ve never replaced ours yet, though.