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I only went for 90mm because I've ranged from 70mm to 115mm on my current bike, to find out what I like. I currently have a 105mm on there, and it's nice, but the handling implications are a bit much for me. I feel that it would be the same, if I had a 120mm - the handling would suffer too adversely to my riding experience. I've found that 90-105mm feels best for me.
I am willing to try other lengths out, though. If I've said anything stupid, please do call me out on it, too.
Woah - I didn't quite understand this. Could you elaborate?
The stem is a Zipp Service Course SL 90mm/17deg
I have a 61cm downtube. Does that mean I should have a 120mm stem?