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Ah ok, I always thought reach was measured to the centre of the top of the headtube
yes this is right.
But imagine you buy both frames and put a 15mm spacer on the small one (to get the bars at the same height). The 15mm spacer goes up and back (at a 72 or 74 degree angle , nobody knows...) so your bars would end up an extra ~4mm back compared to the large frame on top of the difference in reach between the frames.
(edited a bit)
svenhöek
Ah ok, I always thought reach was measured to the centre of the top of the headtube, is it measured at the centre point usually then? Just to confuse things further there's almost certainly differentiations in the way measurements are taken between manufacturers...
50 is probably safest bet then as the reach is already at the higher end of what I need. Ta!