^ it's not that it falls between the biggest cogs and gets stuck. we've all been there when our chain falls either below the smallest cog and actually gets stuck between freewheel and frame, or it hops the biggest cog and gets stuck between spokes and freewheel. it doesn't get stuck.

what it does is slides across the gap between the biggest cogs like the chain came off a chainwheel. pedaling and going nowhere.

if the z-series chains are wider, maybe that's the simple solution to try first, then an epoch freewheel... ****, i don't know.