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@barber
Ben P,
i also read my old post, and as far as i can tell it was nonsense,
i have a fuji track here - and the chainring is dished inwards towards the centre of the bike...
this would mean a regular straight chainring, would sit furthur out, ie/ give a bigger chainline measurement, i dont know by how much exactly, if its 42 ish as standard, a different chainring might increase the measurement to 45 ish or 46ish.
so either a shorter BB is needed, or space out the rear cog to the same chainline.
i never ended up doing anything with mine, my chainring is round like pringles are round, but i haven't been arsed to sort anything out yet.