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@atz
Well I got the freewheel sorted and a bmx one on. Problem now is the gap between teeth on my big ring and the freewheel don't seem compatible. It looks like the freewheel expects a chunkier chain (which isn't unexpected) but I have a feeling if I find the right chain for that, the big ring won't fit. I tried the original chain and two spares (9-speed Shimano, 9-speed SRAM) that I had but no go.
Do I need to go for a chunkier big-ring with larger spacing? The chain is the only part stopping me now as the rest is ridable even if it's not optimal.