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Indeed, low I like, long my body doesn't agree with unfortunately. I usually end up going a frame size down as a result but even the small Pre Cursas are relatively long for their 'size'. May as well go for the 50 on balance, it's slightly lighter, I'm definitely not going to run out of adjustment in any direction and I'm going to need a short stem whichever size I go for so may as well go for the smallest I can get away with.
Does the BB drop vary across the frame sizes? The reach is only a couple of mm different between the 50 and 52 with the same BB drop but I don't know if it's consistent.