A 90 stem isn't stubby on a 50cm frame. It should handle nicely with that length. That said, you may be better off comparing REACH measurement rather than TT measurement. You may find that it is more/less different than you think.
I've never put a lot of value in taller head tube = shorter reach. Mainly because you likely have a bar height that works for you already. I'd rather have you on the correct REACH and the correct BAR HEIGHT. Not trying to compensate one with the other.



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