5/16" apparently: props to Mr LBS who, with barely a cursory glance, declared it to be 3/8"...
@Scilly.Suffolk 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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5/16" apparently: props to Mr LBS who, with barely a cursory glance, declared it to be 3/8"...