I would think she'd be more comfortable on a 23/23.5, at least on most 70s/80s mixtes. DH is 5'10" and I'm 5'7" and we both ride 21.5 Raleigh Supercourses. His is normal, mine's mixte. The seat tube lengths are similar- the difference in geometries is the reach on the mixte is less. The reach on these guys are both rather long relative to most new bikes, so depends if she's all leg- then I'd do a 21.5. Hope that helps.



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Wow, what a great place! And the mixte drool factor on this thread is nearly debilitating. 
