How much more regularly do you normally have to service loose ball hubs
Cut one inch off your piece of string every time you go for a ride. When your remaining string is under one inch, service your hubs.
I suspected that might be your answer
@SkipTown 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.
Cut one inch off your piece of string every time you go for a ride. When your remaining string is under one inch, service your hubs.