If you do not want to lose your bike to some light fingered thieft there is no answer to your specific question.
Two good quality locks in a bag is the only way, an unfortunate paradox to riding a lightweight bike of any quality.
Or do not leave it anywhere unattended.
@daimonic 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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If you do not want to lose your bike to some light fingered thieft there is no answer to your specific question.
Two good quality locks in a bag is the only way, an unfortunate paradox to riding a lightweight bike of any quality.
Or do not leave it anywhere unattended.