interestingly, even chains on turbo bikes get black, suggesting it is not the dirt from the road…
Metal wearing off surfaces presumably
@hippy 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.
interestingly, even chains on turbo bikes get black, suggesting it is not the dirt from the road…