Once you have removed the algae/moss/green growth, you could get it sandblasted so you get more grip?
Yeah, that might be an idea. It's very smooth currently.
@ChasnotRobert 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.
Once you have removed the algae/moss/green growth, you could get it sandblasted so you get more grip?