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@number6
sure the pins and the lowered teeth i understand , the pins pick chain up from the smaller ring when your cranks are horizontal when shifting up and the lowered teeth allow the chain to fall onto the smaller ring when shifting down. but the asymmetrical well is in between the teeth all the way around.
also was really kinda looking for some official info. somewhere to reference to avert the inevitable complaints of "they are worn" once i sell them - and maybe also as a price guide.
TA website and an image search / G2 search have all shown nothing.