I find using a front mech with a single ring helps keep the chain on, maybe leave a friction shifter to adjust it slightly to stop it rubbing when you go from the big to small cog.
Cheap bodged solution?
@Aches 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 find using a front mech with a single ring helps keep the chain on, maybe leave a friction shifter to adjust it slightly to stop it rubbing when you go from the big to small cog.
Cheap bodged solution?