i think they are meant as an alternative rather than a safety measure, i might be wrong but i don't see why they won't be fine on their own.
@Pesto 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.
i think they are meant as an alternative rather than a safety measure, i might be wrong but i don't see why they won't be fine on their own.