bolt croppers, car jacks, hacksaws, angle grinders, skeleton keys, the cover of darkness, cycle helmets (so as to 'blend in'), the list goes on.
You'll never stop a determined thief, but the less attractive / more cumbersome to steal that you can make your bike, the better.
By the look of things thieves don't usually have great taste... they just steal what's easier to get away with.
and easiest to flip....
@Breso started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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bolt croppers, car jacks, hacksaws, angle grinders, skeleton keys, the cover of darkness, cycle helmets (so as to 'blend in'), the list goes on.
You'll never stop a determined thief, but the less attractive / more cumbersome to steal that you can make your bike, the better.