• ST angle by changing the offset of the seatpost and/or using the adjustment scale built into saddle rails.

    yes there is adjustability but not as much as stack and reach with more variables (spacers, stem length, bar shape/reach); what @Maj said

    no1 should base their fit on ST angle, its just that stack and reach are seen as a gospel but they are just one of the factors and not even that important

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