If you can afford it replace both the crank and the bb. If you cant, go buy some thread lock and tighten the bolt up good and proper with plenty of thread lock.
@skink2020 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
If you can afford it replace both the crank and the bb. If you cant, go buy some thread lock and tighten the bolt up good and proper with plenty of thread lock.