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@dubtap
Head tube length plus spacers essentially.
I have two frames with near identical reach but diff stack because one has a 15.5cm HT and the other 14.0cm HT.
I have stem slammed on both so no spacers but the higher stack on the 15.5cm HT I can compensate for by using a -17 deg stem whilst the shorter HT means I'm using a normal -6deg stem.