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As the geo charts have historically not been too accurate, you may end up with a steeper head angle than expected anyway... @svendhöek measured his accurately and it was something like 74 or 75.
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Remember with reach/stack numbers that a larger size bike measures reach higher up the "virtual" headtube so even if the numbers are close the larger size does have more reach at the point where you place your stem.
Does this make sense (I can make a crude drawing...)?
2cm more headtube at 73 degrees gives ~6mm "less" reach
75 degrees gives ~5mm less reachtldr: the difference between size 50 vs size 52 "effective reach" will be about 4mm more than you expect....
Lukas
svenhöek
@ThePeginator
Yeh, the reach difference between 50/52 is minimal, the 50 would give me a bit more adjustment on cockpit height and a few mm less reach, the 52 gives a standard 73 degree head angle as opposed to the slightly awkward 72 on the 50. To be honest either would probably fit me with 5-10mm difference in stem length.