in fact, are you sure that's a fixed cog and not a freewheel? ie, when the bike is leaning against a wall, can you move the cranks backwards without the rear wheel turning? (sorry if this sounds patronising!)
@deleted started
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in fact, are you sure that's a fixed cog and not a freewheel? ie, when the bike is leaning against a wall, can you move the cranks backwards without the rear wheel turning? (sorry if this sounds patronising!)