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@JonoMarshall
B: From memory, one was a high BCD sugino jobby (144), not sure about the others. I have some obscure Shimano/Campag BCDs (all around 39t) for older cranks. I would have thought they're 130 or 144, so a 38t 130 or 40/42t 144, not much difference really so I thought super big fixed cogs would be easier (and I'll bring various bits of chain too).